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dm snapshot: change yield to msleep

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Change yield() to msleep(1). If the thread had realtime priority,
yield() doesn't really yield, so the yielding process would loop
indefinitely and cause machine lockup.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-01-06 03:04:54 +00:00 committed by Alasdair G Kergon
parent a1b51e9867
commit 90fa1527bd
1 changed files with 4 additions and 3 deletions
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7
drivers/md/dm-snap.c
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@ -9,6 +9,7 @@
#include <linux/blkdev.h>
#include <linux/ctype.h>
#include <linux/device-mapper.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
@ -735,7 +736,7 @@ static void snapshot_dtr(struct dm_target *ti)
unregister_snapshot(s);
while (atomic_read(&s->pending_exceptions_count))
yield();
msleep(1);
/*
* Ensure instructions in mempool_destroy aren't reordered
* before atomic_read.
@ -888,10 +889,10 @@ static void pending_complete(struct dm_snap_pending_exception *pe, int success)
/*
* Check for conflicting reads. This is extremely improbable,
* so yield() is sufficient and there is no need for a wait queue.
* so msleep(1) is sufficient and there is no need for a wait queue.
*/
while (__chunk_is_tracked(s, pe->e.old_chunk))
yield();
msleep(1);
/*
* Add a proper exception, and remove the