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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-24 09:35:58 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-12-24 09:35:58 -0800 |
| commit | 4b69316ededd0d2db309c7eca3858144c05fe8c1 (patch) | |
| tree | 09804cd32aeef0ef7d6c5b57894b49cab88b4927 /kernel | |
| parent | auxvec.h: account for AT_HWCAP2 in AT_VECTOR_SIZE_BASE (diff) | |
| parent | libata, freezer: avoid block device removal while system is frozen (diff) | |
| download | linux-dev-4b69316ededd0d2db309c7eca3858144c05fe8c1.tar.xz linux-dev-4b69316ededd0d2db309c7eca3858144c05fe8c1.zip | |
Merge branch 'for-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
Pull libata fixes from Tejun Heo:
"There's one interseting commit - "libata, freezer: avoid block device
removal while system is frozen". It's an ugly hack working around a
deadlock condition between driver core resume and block layer device
removal paths through freezer which was made more reproducible by
writeback being converted to workqueue some releases ago. The bug has
nothing to do with libata but it's just an workaround which is easy to
backport. After discussion, Rafael and I seem to agree that we don't
really need kernel freezables - both kthread and workqueue. There are
few specific workqueues which constitute PM operations and require
freezing, which will be converted to use workqueue_set_max_active()
instead. All other kernel freezer uses are planned to be removed,
followed by the removal of kthread and workqueue freezer support,
hopefully.
Others are device-specific fixes. The most notable is the addition of
NO_NCQ_TRIM which is used to disable queued TRIM commands to Micro
M500 SSDs which otherwise suffers data corruption"
* 'for-3.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata:
libata, freezer: avoid block device removal while system is frozen
libata: implement ATA_HORKAGE_NO_NCQ_TRIM and apply it to Micro M500 SSDs
libata: disable a disk via libata.force params
ahci: bail out on ICH6 before using AHCI BAR
ahci: imx: Explicitly clear IMX6Q_GPR13_SATA_MPLL_CLK_EN
libata: add ATA_HORKAGE_BROKEN_FPDMA_AA quirk for Seagate Momentus SpinPoint M8
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/freezer.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c index b462fa197517..aa6a8aadb911 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -19,6 +19,12 @@ 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); |