linux.git/drivers/s390, branch v2.6.39

Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

2011-05-18T13:49:02+00:00

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: don't delay blk_run_queue_async
  scsi: remove performance regression due to async queue run
  blk-throttle: Use task_subsys_state() to determine a task's blkio_cgroup
  block: rescan partitions on invalidated devices on -ENOMEDIA too
  cdrom: always check_disk_change() on open
  block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers

[S390] dasd: prevent IO error during reserve/release loop

2011-05-10T15:13:42+00:00

The termination of running CQR caused by reserve/release operations
may lead to an IO error if reserve/release is done in a tight loop.
Prevent this by increasing the retry counter after termination.

Signed-off-by: Stefan Haberland 
Signed-off-by: Martin Schwidefsky

[S390] sclp/memory hotplug: fix initial usecount of increments

2011-05-10T15:13:42+00:00

Fix initial usecount of attached and assigned storage increments so
they can be set offline.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

[S390] irqstats: fix counting of pfault, dasd diag and virtio irqs

2011-04-29T08:42:25+00:00

pfault, dasd diag and virtio all use the same external interrupt number.
The respective interrupt handlers decide by the subcode if they are
meant to handle the interrupt.
Counting is currently done before looking at the subcode which means
each handler counts an interrupt even if it is not handling it.
Fix this by moving the kstat code after the code which looks at the
subcode.

Signed-off-by: Heiko Carstens 
Signed-off-by: Martin Schwidefsky

block: unexport DISK_EVENT_MEDIA_CHANGE for legacy/fringe drivers

2011-04-21T19:33:05+00:00

In-kernel disk event polling doesn't matter for legacy/fringe drivers
and may lead to infinite event loop if ->check_events() implementation
generates events on level condition instead of edge.

Now that block layer supports suppressing exporting unlisted events,
simply leaving disk->events cleared allows these drivers to keep the
internal revalidation behavior intact while avoiding weird
interactions with userland event handler.

Signed-off-by: Tejun Heo 
Cc: Kay Sievers 
Signed-off-by: Jens Axboe

[S390] dasd: check sense type in device change handler

2011-04-20T08:15:44+00:00

When evaluating sense data in dasd_eckd_check_for_device_change, we
must always check for the type of sense data in byte 27, bit 0, to
make sure that the rest of the sense data is interpreted correctly.

Signed-off-by: Stefan Weinhuber 
Signed-off-by: Martin Schwidefsky

[S390] qdio: reset error states immediately

2011-04-20T08:15:43+00:00

The qdio hardware may surpress further interrupts as long as a SBAL is in
the error state. That can lead to unnotified data in the SBALs following
the error state. To prevent this behaviour change the SBAL[s] in error
state immediately to another program owned state so interrupts are again
received for further traffic on the device.

Signed-off-by: Jan Glauber 
Signed-off-by: Martin Schwidefsky

[S390] dasd: fix race between open and offline

2011-04-20T08:15:43+00:00

The dasd_open function uses the private_data pointer of the gendisk to
find the dasd_block structure that matches the gendisk. When a DASD
device is set offline, we set the private_data pointer of the gendisk
to NULL and later remove the dasd_block structure, but there is still
a small race window, in which dasd_open could first read a pointer
from the private_data field and then try to use it, after the structure
has already been freed.
To close this race window, we will store a pointer to the dasd_devmap
structure of the base device in the private_data field. The devmap
entries are not deleted, and we already have proper locking and
reference counting in place, so that we can safely get from a devmap
pointer to the dasd_device and dasd_block structures of the device.

Signed-off-by: Stefan Weinhuber 
Signed-off-by: Martin Schwidefsky

Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

2011-04-08T14:36:14+00:00

* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6:
  [S390] compile fix for latest binutils
  [S390] cio: prevent purging of CCW devices in the online state
  [S390] qdio: fix init sequence
  [S390] Fix parameter passing for smp_switch_to_cpu()
  [S390] oprofile s390: prevent stack corruption

[S390] cio: prevent purging of CCW devices in the online state

2011-04-04T07:43:33+00:00

The cio_ignore purge function is intended to only remove CCW devices
which are in the offline state. There is a time frame after the purge
function finished where a CCW device is scheduled for removal but
still accessible. When the device is set online during this time
frame, it may first appear online before it is then removed.

Fix this by preventing that CCW devices can be set online while there
is work (such as removal triggered by the purge function) for it
pending. Also ensure that the purge function does not schedule devices
for removal which are in the process of being set online.

Signed-off-by: Peter Oberparleiter 
Signed-off-by: Martin Schwidefsky