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authorNeilBrown <neilb@suse.de>2006-05-30 21:27:13 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-05-31 16:27:11 -0700
commitc331eb04b995ad276a7ece4608326f1db4e137d8 (patch)
treed3ef167648eb00266696039cc10b32592747e5fe /drivers/md/md.c
parenta835fa798ddfbfe4c63ff5e22c93fa5d24c95f7b (diff)
downloadop-kernel-dev-c331eb04b995ad276a7ece4608326f1db4e137d8.zip
op-kernel-dev-c331eb04b995ad276a7ece4608326f1db4e137d8.tar.gz
[PATCH] md: Fix badness in sysfs_notify caused by md_new_event
From: NeilBrown <neilb@suse.de> If an error is reported by a drive in a RAID array (which is done via bi_end_io - in interrupt context), we call md_error and md_new_event which calls sysfs_notify. However sysfs_notify grabs a mutex and so cannot be called in interrupt context. This patch just creates a variant of md_new_event which avoids the sysfs call, and uses that. A better fix for later is to arrange for the event to be called from user-context. Note: avoiding the sysfs call isn't a problem as an error will not, by itself, modify the sync_action attribute. (We do still need to wake_up(&md_event_waiters) as an error by itself will modify /proc/mdstat). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/md.c')
-rw-r--r--drivers/md/md.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c
index ec80291..f19b874 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -167,6 +167,15 @@ void md_new_event(mddev_t *mddev)
}
EXPORT_SYMBOL_GPL(md_new_event);
+/* Alternate version that can be called from interrupts
+ * when calling sysfs_notify isn't needed.
+ */
+void md_new_event_inintr(mddev_t *mddev)
+{
+ atomic_inc(&md_event_count);
+ wake_up(&md_event_waiters);
+}
+
/*
* Enables to iterate over all existing md arrays
* all_mddevs_lock protects this list.
@@ -4149,7 +4158,7 @@ void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
set_bit(MD_RECOVERY_INTR, &mddev->recovery);
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
md_wakeup_thread(mddev->thread);
- md_new_event(mddev);
+ md_new_event_inintr(mddev);
}
/* seq_file implementation /proc/mdstat */
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