<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-stable.git/drivers/s390, branch v6.4.2</title>
<subtitle>Linux kernel stable tree</subtitle>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/'/>
<entry>
<title>Merge tag 'net-6.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net</title>
<updated>2023-06-16T04:11:17+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2023-06-16T04:11:17+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=40f71e7cd3c6ac04293556ab0504a372393838ff'/>
<id>40f71e7cd3c6ac04293556ab0504a372393838ff</id>
<content type='text'>
Pull networking fixes from Jakub Kicinski:
 "Including fixes from wireless, and netfilter.

  Selftests excluded - we have 58 patches and diff of +442/-199, which
  isn't really small but perhaps with the exception of the WiFi locking
  change it's old(ish) bugs.

  We have no known problems with v6.4.

  The selftest changes are rather large as MPTCP folks try to apply
  Greg's guidance that selftest from torvalds/linux should be able to
  run against stable kernels.

  Last thing I should call out is the DCCP/UDP-lite deprecation notices.
  We are fairly sure those are dead, but if we're wrong reverting them
  back in won't be fun.

  Current release - regressions:

   - wifi:
      - cfg80211: fix double lock bug in reg_wdev_chan_valid()
      - iwlwifi: mvm: spin_lock_bh() to fix lockdep regression

  Current release - new code bugs:

   - handshake: remove fput() that causes use-after-free

  Previous releases - regressions:

   - sched: cls_u32: fix reference counter leak leading to overflow

   - sched: cls_api: fix lockup on flushing explicitly created chain

  Previous releases - always broken:

   - nf_tables: integrate pipapo into commit protocol

   - nf_tables: incorrect error path handling with NFT_MSG_NEWRULE, fix
     dangling pointer on failure

   - ping6: fix send to link-local addresses with VRF

   - sched: act_pedit: parse L3 header for L4 offset, the skb may not
     have the offset saved

   - sched: act_ct: fix promotion of offloaded unreplied tuple

   - sched: refuse to destroy an ingress and clsact Qdiscs if there are
     lockless change operations in flight

   - wifi: mac80211: fix handful of bugs in multi-link operation

   - ipvlan: fix bound dev checking for IPv6 l3s mode

   - eth: enetc: correct the indexes of highest and 2nd highest TCs

   - eth: ice: fix XDP memory leak when NIC is brought up and down

  Misc:

   - add deprecation notices for UDP-lite and DCCP

   - selftests: mptcp: skip tests not supported by old kernels

   - sctp: handle invalid error codes without calling BUG()"

* tag 'net-6.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (91 commits)
  dccp: Print deprecation notice.
  udplite: Print deprecation notice.
  octeon_ep: Add missing check for ioremap
  selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET
  net: ethernet: stmicro: stmmac: fix possible memory leak in __stmmac_open
  net: tipc: resize nlattr array to correct size
  sfc: fix XDP queues mode with legacy IRQ
  net: macsec: fix double free of percpu stats
  net: lapbether: only support ethernet devices
  MAINTAINERS: add reviewers for SMC Sockets
  s390/ism: Fix trying to free already-freed IRQ by repeated ism_dev_exit()
  net: dsa: felix: fix taprio guard band overflow at 10Mbps with jumbo frames
  net/sched: cls_api: Fix lockup on flushing explicitly created chain
  ice: Fix ice module unload
  net/handshake: remove fput() that causes use-after-free
  selftests: forwarding: hw_stats_l3: Set addrgenmode in a separate step
  net/sched: qdisc_destroy() old ingress and clsact Qdiscs before grafting
  net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs
  net/sched: act_ct: Fix promotion of offloaded unreplied tuple
  wifi: iwlwifi: mvm: spin_lock_bh() to fix lockdep regression
  ...
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull networking fixes from Jakub Kicinski:
 "Including fixes from wireless, and netfilter.

  Selftests excluded - we have 58 patches and diff of +442/-199, which
  isn't really small but perhaps with the exception of the WiFi locking
  change it's old(ish) bugs.

  We have no known problems with v6.4.

  The selftest changes are rather large as MPTCP folks try to apply
  Greg's guidance that selftest from torvalds/linux should be able to
  run against stable kernels.

  Last thing I should call out is the DCCP/UDP-lite deprecation notices.
  We are fairly sure those are dead, but if we're wrong reverting them
  back in won't be fun.

  Current release - regressions:

   - wifi:
      - cfg80211: fix double lock bug in reg_wdev_chan_valid()
      - iwlwifi: mvm: spin_lock_bh() to fix lockdep regression

  Current release - new code bugs:

   - handshake: remove fput() that causes use-after-free

  Previous releases - regressions:

   - sched: cls_u32: fix reference counter leak leading to overflow

   - sched: cls_api: fix lockup on flushing explicitly created chain

  Previous releases - always broken:

   - nf_tables: integrate pipapo into commit protocol

   - nf_tables: incorrect error path handling with NFT_MSG_NEWRULE, fix
     dangling pointer on failure

   - ping6: fix send to link-local addresses with VRF

   - sched: act_pedit: parse L3 header for L4 offset, the skb may not
     have the offset saved

   - sched: act_ct: fix promotion of offloaded unreplied tuple

   - sched: refuse to destroy an ingress and clsact Qdiscs if there are
     lockless change operations in flight

   - wifi: mac80211: fix handful of bugs in multi-link operation

   - ipvlan: fix bound dev checking for IPv6 l3s mode

   - eth: enetc: correct the indexes of highest and 2nd highest TCs

   - eth: ice: fix XDP memory leak when NIC is brought up and down

  Misc:

   - add deprecation notices for UDP-lite and DCCP

   - selftests: mptcp: skip tests not supported by old kernels

   - sctp: handle invalid error codes without calling BUG()"

* tag 'net-6.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (91 commits)
  dccp: Print deprecation notice.
  udplite: Print deprecation notice.
  octeon_ep: Add missing check for ioremap
  selftests/ptp: Fix timestamp printf format for PTP_SYS_OFFSET
  net: ethernet: stmicro: stmmac: fix possible memory leak in __stmmac_open
  net: tipc: resize nlattr array to correct size
  sfc: fix XDP queues mode with legacy IRQ
  net: macsec: fix double free of percpu stats
  net: lapbether: only support ethernet devices
  MAINTAINERS: add reviewers for SMC Sockets
  s390/ism: Fix trying to free already-freed IRQ by repeated ism_dev_exit()
  net: dsa: felix: fix taprio guard band overflow at 10Mbps with jumbo frames
  net/sched: cls_api: Fix lockup on flushing explicitly created chain
  ice: Fix ice module unload
  net/handshake: remove fput() that causes use-after-free
  selftests: forwarding: hw_stats_l3: Set addrgenmode in a separate step
  net/sched: qdisc_destroy() old ingress and clsact Qdiscs before grafting
  net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs
  net/sched: act_ct: Fix promotion of offloaded unreplied tuple
  wifi: iwlwifi: mvm: spin_lock_bh() to fix lockdep regression
  ...
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/ism: Fix trying to free already-freed IRQ by repeated ism_dev_exit()</title>
<updated>2023-06-15T07:48:45+00:00</updated>
<author>
<name>Julian Ruess</name>
<email>julianr@linux.ibm.com</email>
</author>
<published>2023-06-13T12:25:37+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=78d0f94902afce8ec2c7a60f600cc0e3729d7412'/>
<id>78d0f94902afce8ec2c7a60f600cc0e3729d7412</id>
<content type='text'>
This patch prevents the system from crashing when unloading the ISM module.

How to reproduce: Attach an ISM device and execute 'rmmod ism'.

Error-Log:
- Trying to free already-free IRQ 0
- WARNING: CPU: 1 PID: 966 at kernel/irq/manage.c:1890 free_irq+0x140/0x540

After calling ism_dev_exit() for each ISM device in the exit routine,
pci_unregister_driver() will execute ism_remove() for each ISM device.
Because ism_remove() also calls ism_dev_exit(),
free_irq(pci_irq_vector(pdev, 0), ism) is called twice for each ISM
device. This results in a crash with the error
'Trying to free already-free IRQ'.

In the exit routine, it is enough to call pci_unregister_driver()
because it ensures that ism_dev_exit() is called once per
ISM device.

Cc: &lt;stable@vger.kernel.org&gt; # 6.3+
Fixes: 89e7d2ba61b7 ("net/ism: Add new API for client registration")
Reviewed-by: Niklas Schnelle &lt;schnelle@linux.ibm.com&gt;
Signed-off-by: Julian Ruess &lt;julianr@linux.ibm.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
This patch prevents the system from crashing when unloading the ISM module.

How to reproduce: Attach an ISM device and execute 'rmmod ism'.

Error-Log:
- Trying to free already-free IRQ 0
- WARNING: CPU: 1 PID: 966 at kernel/irq/manage.c:1890 free_irq+0x140/0x540

After calling ism_dev_exit() for each ISM device in the exit routine,
pci_unregister_driver() will execute ism_remove() for each ISM device.
Because ism_remove() also calls ism_dev_exit(),
free_irq(pci_irq_vector(pdev, 0), ism) is called twice for each ISM
device. This results in a crash with the error
'Trying to free already-free IRQ'.

In the exit routine, it is enough to call pci_unregister_driver()
because it ensures that ism_dev_exit() is called once per
ISM device.

Cc: &lt;stable@vger.kernel.org&gt; # 6.3+
Fixes: 89e7d2ba61b7 ("net/ism: Add new API for client registration")
Reviewed-by: Niklas Schnelle &lt;schnelle@linux.ibm.com&gt;
Signed-off-by: Julian Ruess &lt;julianr@linux.ibm.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'block-6.4-2023-06-09' of git://git.kernel.dk/linux</title>
<updated>2023-06-09T21:21:20+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2023-06-09T21:21:20+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=64569520920a3ca5d456ddd9f4f95fc6ea9b8b45'/>
<id>64569520920a3ca5d456ddd9f4f95fc6ea9b8b45</id>
<content type='text'>
Pull block fixes from Jens Axboe:

 - Fix an issue with the hardware queue nr_active, causing it to become
   imbalanced (Tian)

 - Fix an issue with null_blk not releasing pages if configured as
   memory backed (Nitesh)

 - Fix a locking issue in dasd (Jan)

* tag 'block-6.4-2023-06-09' of git://git.kernel.dk/linux:
  s390/dasd: Use correct lock while counting channel queue length
  null_blk: Fix: memory release when memory_backed=1
  blk-mq: fix blk_mq_hw_ctx active request accounting
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull block fixes from Jens Axboe:

 - Fix an issue with the hardware queue nr_active, causing it to become
   imbalanced (Tian)

 - Fix an issue with null_blk not releasing pages if configured as
   memory backed (Nitesh)

 - Fix a locking issue in dasd (Jan)

* tag 'block-6.4-2023-06-09' of git://git.kernel.dk/linux:
  s390/dasd: Use correct lock while counting channel queue length
  null_blk: Fix: memory release when memory_backed=1
  blk-mq: fix blk_mq_hw_ctx active request accounting
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/dasd: Use correct lock while counting channel queue length</title>
<updated>2023-06-09T17:35:52+00:00</updated>
<author>
<name>Jan Höppner</name>
<email>hoeppner@linux.ibm.com</email>
</author>
<published>2023-06-09T15:37:50+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=ccc45cb4e7271c74dbb27776ae8f73d84557f5c6'/>
<id>ccc45cb4e7271c74dbb27776ae8f73d84557f5c6</id>
<content type='text'>
The lock around counting the channel queue length in the BIODASDINFO
ioctl was incorrectly changed to the dasd_block-&gt;queue_lock with commit
583d6535cb9d ("dasd: remove dead code"). This can lead to endless list
iterations and a subsequent crash.

The queue_lock is supposed to be used only for queue lists belonging to
dasd_block. For dasd_device related queue lists the ccwdev lock must be
used.

Fix the mentioned issues by correctly using the ccwdev lock instead of
the queue lock.

Fixes: 583d6535cb9d ("dasd: remove dead code")
Cc: stable@vger.kernel.org # v5.0+
Signed-off-by: Jan Höppner &lt;hoeppner@linux.ibm.com&gt;
Reviewed-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Signed-off-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Link: https://lore.kernel.org/r/20230609153750.1258763-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe &lt;axboe@kernel.dk&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
The lock around counting the channel queue length in the BIODASDINFO
ioctl was incorrectly changed to the dasd_block-&gt;queue_lock with commit
583d6535cb9d ("dasd: remove dead code"). This can lead to endless list
iterations and a subsequent crash.

The queue_lock is supposed to be used only for queue lists belonging to
dasd_block. For dasd_device related queue lists the ccwdev lock must be
used.

Fix the mentioned issues by correctly using the ccwdev lock instead of
the queue lock.

Fixes: 583d6535cb9d ("dasd: remove dead code")
Cc: stable@vger.kernel.org # v5.0+
Signed-off-by: Jan Höppner &lt;hoeppner@linux.ibm.com&gt;
Reviewed-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Signed-off-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Link: https://lore.kernel.org/r/20230609153750.1258763-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe &lt;axboe@kernel.dk&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 's390-6.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux</title>
<updated>2023-06-09T16:29:51+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2023-06-09T16:29:51+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=87aceaa7f083cd4e77e28943bc5535ef34ead498'/>
<id>87aceaa7f083cd4e77e28943bc5535ef34ead498</id>
<content type='text'>
Pull s390 fixes from Alexander Gordeev:

 - Avoid linker error for randomly generated config file that has
   CONFIG_BRANCH_PROFILE_NONE enabled and make it similar to riscv, x86
   and also to commit 4bf3ec384edf ("s390: disable branch profiling for
   vdso").

 - Currently, if the device is offline and all the channel paths are
   either configured or varied offline, the associated subchannel gets
   unregistered. Don't unregister the subchannel, instead unregister
   offline device.

* tag 's390-6.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/purgatory: disable branch profiling
  s390/cio: unregister device when the only path is gone
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull s390 fixes from Alexander Gordeev:

 - Avoid linker error for randomly generated config file that has
   CONFIG_BRANCH_PROFILE_NONE enabled and make it similar to riscv, x86
   and also to commit 4bf3ec384edf ("s390: disable branch profiling for
   vdso").

 - Currently, if the device is offline and all the channel paths are
   either configured or varied offline, the associated subchannel gets
   unregistered. Don't unregister the subchannel, instead unregister
   offline device.

* tag 's390-6.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/purgatory: disable branch profiling
  s390/cio: unregister device when the only path is gone
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/cio: unregister device when the only path is gone</title>
<updated>2023-05-22T10:45:44+00:00</updated>
<author>
<name>Vineeth Vijayan</name>
<email>vneethv@linux.ibm.com</email>
</author>
<published>2023-05-04T18:53:20+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=89c0c62e947a01e7a36b54582fd9c9e346170255'/>
<id>89c0c62e947a01e7a36b54582fd9c9e346170255</id>
<content type='text'>
Currently, if the device is offline and all the channel paths are
either configured or varied offline, the associated subchannel gets
unregistered. Don't unregister the subchannel, instead unregister
offline device.

Signed-off-by: Vineeth Vijayan &lt;vneethv@linux.ibm.com&gt;
Reviewed-by: Peter Oberparleiter &lt;oberpar@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Currently, if the device is offline and all the channel paths are
either configured or varied offline, the associated subchannel gets
unregistered. Don't unregister the subchannel, instead unregister
offline device.

Signed-off-by: Vineeth Vijayan &lt;vneethv@linux.ibm.com&gt;
Reviewed-by: Peter Oberparleiter &lt;oberpar@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>Merge tag 'block-6.4-2023-05-20' of git://git.kernel.dk/linux</title>
<updated>2023-05-20T15:48:04+00:00</updated>
<author>
<name>Linus Torvalds</name>
<email>torvalds@linux-foundation.org</email>
</author>
<published>2023-05-20T15:48:04+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=98be58a6e9310fbfa757d438b0b51f857ce17ee4'/>
<id>98be58a6e9310fbfa757d438b0b51f857ce17ee4</id>
<content type='text'>
Pull block fixes from Jens Axboe:

 - NVMe pull request via Keith:
     - More device quirks (Sagi, Hristo, Adrian, Daniel)
     - Controller delete race (Maurizo)
     - Multipath cleanup fix (Christoph)

 - Deny writeable mmap mapping on a readonly block device (Loic)

 - Kill unused define that got introduced by accident (Christoph)

 - Error handling fix for s390 dasd (Stefan)

 - ublk locking fix (Ming)

* tag 'block-6.4-2023-05-20' of git://git.kernel.dk/linux:
  block: remove NFL4_UFLG_MASK
  block: Deny writable memory mapping if block is read-only
  s390/dasd: fix command reject error on ESE devices
  nvme-pci: Add quirk for Teamgroup MP33 SSD
  ublk: fix AB-BA lockdep warning
  nvme: do not let the user delete a ctrl before a complete initialization
  nvme-multipath: don't call blk_mark_disk_dead in nvme_mpath_remove_disk
  nvme-pci: clamp max_hw_sectors based on DMA optimized limitation
  nvme-pci: add quirk for missing secondary temperature thresholds
  nvme-pci: add NVME_QUIRK_BOGUS_NID for HS-SSD-FUTURE 2048G
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Pull block fixes from Jens Axboe:

 - NVMe pull request via Keith:
     - More device quirks (Sagi, Hristo, Adrian, Daniel)
     - Controller delete race (Maurizo)
     - Multipath cleanup fix (Christoph)

 - Deny writeable mmap mapping on a readonly block device (Loic)

 - Kill unused define that got introduced by accident (Christoph)

 - Error handling fix for s390 dasd (Stefan)

 - ublk locking fix (Ming)

* tag 'block-6.4-2023-05-20' of git://git.kernel.dk/linux:
  block: remove NFL4_UFLG_MASK
  block: Deny writable memory mapping if block is read-only
  s390/dasd: fix command reject error on ESE devices
  nvme-pci: Add quirk for Teamgroup MP33 SSD
  ublk: fix AB-BA lockdep warning
  nvme: do not let the user delete a ctrl before a complete initialization
  nvme-multipath: don't call blk_mark_disk_dead in nvme_mpath_remove_disk
  nvme-pci: clamp max_hw_sectors based on DMA optimized limitation
  nvme-pci: add quirk for missing secondary temperature thresholds
  nvme-pci: add NVME_QUIRK_BOGUS_NID for HS-SSD-FUTURE 2048G
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/dasd: fix command reject error on ESE devices</title>
<updated>2023-05-20T02:03:59+00:00</updated>
<author>
<name>Stefan Haberland</name>
<email>sth@linux.ibm.com</email>
</author>
<published>2023-05-19T10:23:40+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=c99bff34290f1b994073557b754aff86e4c7b22e'/>
<id>c99bff34290f1b994073557b754aff86e4c7b22e</id>
<content type='text'>
Formatting a thin-provisioned (ESE) device that is part of a PPRC copy
relation might fail with the following error:

dasd-eckd 0.0.f500: An error occurred in the DASD device driver, reason=09
[...]
24 Byte: 0 MSG 4, no MSGb to SYSOP

During format of an ESE disk the Release Allocated Space command is used.
A bit in the payload of the command is set that is not allowed to be set
for devices in a copy relation. This bit is set to allow the partial
release of an extent.

Check for the existence of a copy relation before setting the respective
bit.

Fixes: 91dc4a197569 ("s390/dasd: Add new ioctl to release space")
Cc: stable@kernel.org # 5.3+
Signed-off-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Reviewed-by: Jan Hoeppner &lt;hoeppner@linux.ibm.com&gt;
Link: https://lore.kernel.org/r/20230519102340.3854819-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe &lt;axboe@kernel.dk&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Formatting a thin-provisioned (ESE) device that is part of a PPRC copy
relation might fail with the following error:

dasd-eckd 0.0.f500: An error occurred in the DASD device driver, reason=09
[...]
24 Byte: 0 MSG 4, no MSGb to SYSOP

During format of an ESE disk the Release Allocated Space command is used.
A bit in the payload of the command is set that is not allowed to be set
for devices in a copy relation. This bit is set to allow the partial
release of an extent.

Check for the existence of a copy relation before setting the respective
bit.

Fixes: 91dc4a197569 ("s390/dasd: Add new ioctl to release space")
Cc: stable@kernel.org # 5.3+
Signed-off-by: Stefan Haberland &lt;sth@linux.ibm.com&gt;
Reviewed-by: Jan Hoeppner &lt;hoeppner@linux.ibm.com&gt;
Link: https://lore.kernel.org/r/20230519102340.3854819-2-sth@linux.ibm.com
Signed-off-by: Jens Axboe &lt;axboe@kernel.dk&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/qdio: fix do_sqbs() inline assembly constraint</title>
<updated>2023-05-17T13:20:17+00:00</updated>
<author>
<name>Heiko Carstens</name>
<email>hca@linux.ibm.com</email>
</author>
<published>2023-05-11T15:04:41+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=2862a2fdfae875888e3c1c3634e3422e01d98147'/>
<id>2862a2fdfae875888e3c1c3634e3422e01d98147</id>
<content type='text'>
Use "a" constraint instead of "d" constraint to pass the state parameter to
the do_sqbs() inline assembly. This prevents that general purpose register
zero is used for the state parameter.

If the compiler would select general purpose register zero this would be
problematic for the used instruction in rsy format: the register used for
the state parameter is a base register. If the base register is general
purpose register zero the contents of the register are unexpectedly ignored
when the instruction is executed.

This only applies to z/VM guests using QIOASSIST with dedicated (pass through)
QDIO-based devices such as FCP [zfcp driver] as well as real OSA or
HiperSockets [qeth driver].

A possible symptom for this case using zfcp is the following repeating kernel
message pattern:

zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: qdio: ZFCP on SC &lt;sc&gt; using AI:1 QEBSM:1 PRI:1 TDD:1 SIGA: W
zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: A QDIO problem occurred

Each of the qdio problem message can be accompanied by the following entries
for the affected subchannel &lt;sc&gt; in
/sys/kernel/debug/s390dbf/qdio_error/hex_ascii for zfcp or qeth:

&lt;sc&gt; ccq: 69....
&lt;sc&gt; SQBS ERROR.

Reviewed-by: Benjamin Block &lt;bblock@linux.ibm.com&gt;
Cc: Steffen Maier &lt;maier@linux.ibm.com&gt;
Fixes: 8129ee164267 ("[PATCH] s390: qdio V=V pass-through")
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Heiko Carstens &lt;hca@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Use "a" constraint instead of "d" constraint to pass the state parameter to
the do_sqbs() inline assembly. This prevents that general purpose register
zero is used for the state parameter.

If the compiler would select general purpose register zero this would be
problematic for the used instruction in rsy format: the register used for
the state parameter is a base register. If the base register is general
purpose register zero the contents of the register are unexpectedly ignored
when the instruction is executed.

This only applies to z/VM guests using QIOASSIST with dedicated (pass through)
QDIO-based devices such as FCP [zfcp driver] as well as real OSA or
HiperSockets [qeth driver].

A possible symptom for this case using zfcp is the following repeating kernel
message pattern:

zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: qdio: ZFCP on SC &lt;sc&gt; using AI:1 QEBSM:1 PRI:1 TDD:1 SIGA: W
zfcp &lt;devbusid&gt;: A QDIO problem occurred
zfcp &lt;devbusid&gt;: A QDIO problem occurred

Each of the qdio problem message can be accompanied by the following entries
for the affected subchannel &lt;sc&gt; in
/sys/kernel/debug/s390dbf/qdio_error/hex_ascii for zfcp or qeth:

&lt;sc&gt; ccq: 69....
&lt;sc&gt; SQBS ERROR.

Reviewed-by: Benjamin Block &lt;bblock@linux.ibm.com&gt;
Cc: Steffen Maier &lt;maier@linux.ibm.com&gt;
Fixes: 8129ee164267 ("[PATCH] s390: qdio V=V pass-through")
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Heiko Carstens &lt;hca@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>s390/cio: include subchannels without devices also for evaluation</title>
<updated>2023-05-15T12:20:14+00:00</updated>
<author>
<name>Vineeth Vijayan</name>
<email>vneethv@linux.ibm.com</email>
</author>
<published>2023-05-02T09:12:42+00:00</published>
<link rel='alternate' type='text/html' href='https://git.tavy.me/linux-stable.git/commit/?id=b1b0d5aec1cf9f9a900a14964f869c68688d923e'/>
<id>b1b0d5aec1cf9f9a900a14964f869c68688d923e</id>
<content type='text'>
Currently when the new channel-path is enabled, we do evaluation only
on the subchannels with a device connected on it. This is because,
in the past, if the device in the subchannel is not working or not
available, we used to unregister the subchannels. But, from the 'commit
2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")'
we allow subchannels with or without an active device connected
on it. So, when we do the io_subchannel_verify, make sure that,
we are evaluating the subchannels without any device too.

Fixes: 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")
Reported-by: Boris Fiuczynski &lt;fiuczy@linux.ibm.com&gt;
Signed-off-by: Vineeth Vijayan &lt;vneethv@linux.ibm.com&gt;
Reviewed-by: Peter Oberparleiter &lt;oberpar@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Currently when the new channel-path is enabled, we do evaluation only
on the subchannels with a device connected on it. This is because,
in the past, if the device in the subchannel is not working or not
available, we used to unregister the subchannels. But, from the 'commit
2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")'
we allow subchannels with or without an active device connected
on it. So, when we do the io_subchannel_verify, make sure that,
we are evaluating the subchannels without any device too.

Fixes: 2297791c92d0 ("s390/cio: dont unregister subchannel from child-drivers")
Reported-by: Boris Fiuczynski &lt;fiuczy@linux.ibm.com&gt;
Signed-off-by: Vineeth Vijayan &lt;vneethv@linux.ibm.com&gt;
Reviewed-by: Peter Oberparleiter &lt;oberpar@linux.ibm.com&gt;
Signed-off-by: Alexander Gordeev &lt;agordeev@linux.ibm.com&gt;
</pre>
</div>
</content>
</entry>
</feed>
