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authorLinus Torvalds <torvalds@linux-foundation.org>2013-12-24 09:35:58 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2013-12-24 09:35:58 -0800
commit4b69316ededd0d2db309c7eca3858144c05fe8c1 (patch)
tree09804cd32aeef0ef7d6c5b57894b49cab88b4927 /kernel
parentf60900f2609e893c7f8d0bccc7ada4947dac4cd5 (diff)
parent85fbd722ad0f5d64d1ad15888cd1eb2188bfb557 (diff)
downloadop-kernel-dev-4b69316ededd0d2db309c7eca3858144c05fe8c1.zip
op-kernel-dev-4b69316ededd0d2db309c7eca3858144c05fe8c1.tar.gz
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.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/freezer.c b/kernel/freezer.c
index b462fa1..aa6a8aa 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);
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