Commit 0e48f51c authored by Mika Westerberg's avatar Mika Westerberg Committed by Jens Axboe

Revert "libata, freezer: avoid block device removal while system is frozen"

This reverts commit 85fbd722.

The commit was added as a quick band-aid for a hang that happened when a
block device was removed during system suspend. Now that bdi_wq is not
freezable anymore the hang should not be possible and we can get rid of
this hack by reverting it.
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent a2b90f11
......@@ -4791,27 +4791,6 @@ void ata_scsi_hotplug(struct work_struct *work)
return;
}
/*
* XXX - UGLY HACK
*
* The block layer suspend/resume path is fundamentally broken due
* to freezable kthreads and workqueue and may deadlock if a block
* device gets removed while resume is in progress. I don't know
* what the solution is short of removing freezable kthreads and
* workqueues altogether.
*
* The following is an ugly hack to avoid kicking off device
* removal while freezer is active. This is a joke but does avoid
* this particular deadlock scenario.
*
* https://bugzilla.kernel.org/show_bug.cgi?id=62801
* http://marc.info/?l=linux-kernel&m=138695698516487
*/
#ifdef CONFIG_FREEZER
while (pm_freezing)
msleep(10);
#endif
DPRINTK("ENTER\n");
mutex_lock(&ap->scsi_scan_mutex);
......
......@@ -22,12 +22,6 @@ EXPORT_SYMBOL(system_freezing_cnt);
bool pm_freezing;
bool pm_nosig_freezing;
/*
* Temporary export for the deadlock workaround in ata_scsi_hotplug().
* Remove once the hack becomes unnecessary.
*/
EXPORT_SYMBOL_GPL(pm_freezing);
/* protects freezing and frozen transitions */
static DEFINE_SPINLOCK(freezer_lock);
......
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