linux.git/drivers/scsi/hosts.c, branch v3.13

[SCSI] Disable WRITE SAME for RAID and virtual host adapter drivers

2013-11-29T04:48:39+00:00

Some host adapters do not pass commands through to the target disk
directly. Instead they provide an emulated target which may or may not
accurately report its capabilities. In some cases the physical device
characteristics are reported even when the host adapter is processing
commands on the device's behalf. This can lead to adapter firmware hangs
or excessive I/O errors.

This patch disables WRITE SAME for devices connected to host adapters
that provide an emulated target. Driver writers can disable WRITE SAME
by setting the no_write_same flag in the host adapter template.

[jejb: fix up rejections due to eh_deadline patch]
Signed-off-by: Martin K. Petersen 
Cc: stable@kernel.org
Signed-off-by: James Bottomley

[SCSI] Add 'eh_deadline' to limit SCSI EH runtime

2013-10-25T11:17:59+00:00

This patchs adds an 'eh_deadline' sysfs attribute to the scsi
host which limits the overall runtime of the SCSI EH.
The 'eh_deadline' value is stored in the now obsolete field
'resetting'.
When a command is failed the start time of the EH is stored
in 'last_reset'. If the overall runtime of the SCSI EH is longer
than last_reset + eh_deadline, the EH is short-circuited and
falls through to issue a host reset only.

[jejb: add comments in Scsi_Host about new fields]
Signed-off-by: Hannes Reinecke 
Signed-off-by: James Bottomley

driver-core: constify data for class_find_device()

2013-02-06T20:18:56+00:00

All in-kernel users of class_find_device() don't really need mutable
data for match callback.

In two places (kernel/power/suspend_test.c, drivers/scsi/osd/osd_uld.c)
this patch changes match callbacks to use const search data.

The const is propagated to rtc_class_open() and power_supply_get_by_name()
parameters.

Note that there's a dev reference leak in suspend_test.c that's not
touched in this patch.

Signed-off-by: Michał Mirosław 
Acked-by: Grant Likely 
Signed-off-by: Greg Kroah-Hartman

[SCSI] Fix device removal NULL pointer dereference

2012-07-20T07:58:40+00:00

Use blk_queue_dead() to test whether the queue is dead instead
of !sdev. Since scsi_prep_fn() may be invoked concurrently with
__scsi_remove_device(), keep the queuedata (sdev) pointer in
__scsi_remove_device(). This patch fixes a kernel oops that
can be triggered by USB device removal. See also
http://www.spinics.net/lists/linux-scsi/msg56254.html.

Other changes included in this patch:
- Swap the blk_cleanup_queue() and kfree() calls in
  scsi_host_dev_release() to make that code easier to grasp.
- Remove the queue dead check from scsi_run_queue() since the
  queue state can change anyway at any point in that function
  where the queue lock is not held.
- Remove the queue dead check from the start of scsi_request_fn()
  since it is redundant with the scsi_device_online() check.

Reported-by: Jun'ichi Nomura 
Signed-off-by: Bart Van Assche 
Reviewed-by: Mike Christie 
Reviewed-by: Tejun Heo 
Cc: 
Signed-off-by: James Bottomley

[SCSI] properly initialize atomic_t

2012-07-20T07:58:36+00:00

Initialize atomic_t scsi_host_next_hn and ioerr_cntas per the guidelines
defined in Documentation/atomic_ops.txt

Signed-off-by: Josh Hunt 
Signed-off-by: James Bottomley

[SCSI] fix oops in all legacy host adapters caused by 6f381fa

2012-05-10T07:24:13+00:00

Commit 6f381fa344911d5a234b13574433cf23036f9467
Author: Lin Ming 

[SCSI] scsi_lib: use correct DMA device in __scsi_alloc_queue
 
Caused a regression where we oops in every legacy mode SCSI host driver
because they supply a NULL pointer to scsi_add_host().  Fix this by checking
for the NULL in scsi_add_host_with_dma() and changing the DMA device to being
the platform_bus in that case (which replicates the original behaviour).

Reported-by: Al Viro 
Signed-off-by: James Bottomley

[SCSI] Make scsi_free_queue() kill pending SCSI commands

2011-10-30T09:20:28+00:00

Make sure that SCSI device removal via scsi_remove_host() does finish
all pending SCSI commands. Currently that's not the case and hence
removal of a SCSI host during I/O can cause a deadlock. See also
"blkdev_issue_discard() hangs forever if underlying storage device is
removed" (http://bugzilla.kernel.org/show_bug.cgi?id=40472). See also
http://lkml.org/lkml/2011/8/27/6.

Signed-off-by: Bart Van Assche 
Cc: 
Signed-off-by: James Bottomley

Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6

2010-10-23T02:36:42+00:00

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6: (31 commits)
  driver core: Display error codes when class suspend fails
  Driver core: Add section count to memory_block struct
  Driver core: Add mutex for adding/removing memory blocks
  Driver core: Move find_memory_block routine
  hpilo: Despecificate driver from iLO generation
  driver core: Convert link_mem_sections to use find_memory_block_hinted.
  driver core: Introduce find_memory_block_hinted which utilizes kset_find_obj_hinted.
  kobject: Introduce kset_find_obj_hinted.
  driver core: fix build for CONFIG_BLOCK not enabled
  driver-core: base: change to new flag variable
  sysfs: only access bin file vm_ops with the active lock
  sysfs: Fail bin file mmap if vma close is implemented.
  FW_LOADER: fix kconfig dependency warning on HOTPLUG
  uio: Statically allocate uio_class and use class .dev_attrs.
  uio: Support 2^MINOR_BITS minors
  uio: Cleanup irq handling.
  uio: Don't clear driver data
  uio: Fix lack of locking in init_uio_class
  SYSFS: Allow boot time switching between deprecated and modern sysfs layout
  driver core: remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices
  ...

driver core: remove CONFIG_SYSFS_DEPRECATED_V2 but keep it for block devices

2010-10-22T17:16:43+00:00

This patch removes the old CONFIG_SYSFS_DEPRECATED_V2 config option,
but it keeps the logic around to handle block devices in the old manner
as some people like to run new kernel versions on old (pre 2007/2008)
distros.

Signed-off-by: Kay Sievers 
Cc: Jens Axboe 
Cc: Stephen Hemminger 
Cc: "Eric W. Biederman" 
Cc: Alan Stern 
Cc: "James E.J. Bottomley" 
Cc: Andrew Morton 
Cc: Alexey Kuznetsov 
Cc: Randy Dunlap 
Cc: Tejun Heo 
Cc: "David S. Miller" 
Cc: Jaroslav Kysela 
Cc: Takashi Iwai 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: David Howells 
Signed-off-by: Greg Kroah-Hartman

block/scsi: Provide a limit on the number of integrity segments

2010-09-10T18:50:10+00:00

Some controllers have a hardware limit on the number of protection
information scatter-gather list segments they can handle.

Introduce a max_integrity_segments limit in the block layer and provide
a new scsi_host_template setting that allows HBA drivers to provide a
value suitable for the hardware.

Add support for honoring the integrity segment limit when merging both
bios and requests.

Signed-off-by: Martin K. Petersen 
Signed-off-by: Jens Axboe