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Linus Torvalds
a817e73fe6
This reverts commit 8a97712e53.
This commit added a call to sysfs_notify() from within
scsi_device_set_state(), which in turn turns out to make libata very
unhappy, because ata_eh_detach_dev() does
spin_lock_irqsave(ap->lock, flags);
..
if (ata_scsi_offline_dev(dev)) {
dev->flags |= ATA_DFLAG_DETACHED;
ap->pflags |= ATA_PFLAG_SCSI_HOTPLUG;
}
and ata_scsi_offline_dev() then does that scsi_device_set_state() to set
it offline.
So now we called sysfs_notify() from within a spinlocked region, which
really doesn't work. The 0day robot reported this as:
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:238
because sysfs_notify() ends up calling kernfs_find_and_get_ns() which
then does mutex_lock(&kernfs_mutex)..
The pollability of the device state isn't critical, so revert this all
for now, and maybe we'll do it differently in the future.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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