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dm integrity: change 'suspending' variable from bool to int 

Early alpha processors can't write a byte or short atomically - they
read 8 bytes, modify the byte or two bytes in registers and write back
8 bytes.

The modification of the variable "suspending" may race with
modification of the variable "failed".  Fix this by changing
"suspending" to an int.

Cc: stable@vger.kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2018-07-03 20:13:25 +02:00 committed by Mike Snitzer
parent cda6b5ab7f
commit c21b163927
1 changed files with 3 additions and 3 deletions
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6
drivers/md/dm-integrity.c
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@ -178,7 +178,7 @@ struct dm_integrity_c {
__u8 sectors_per_block;
unsigned char mode;
bool suspending;
int suspending;
int failed;
@ -2210,7 +2210,7 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
del_timer_sync(&ic->autocommit_timer);
ic->suspending = true;
WRITE_ONCE(ic->suspending, 1);
queue_work(ic->commit_wq, &ic->commit_work);
drain_workqueue(ic->commit_wq);
@ -2220,7 +2220,7 @@ static void dm_integrity_postsuspend(struct dm_target *ti)
dm_integrity_flush_buffers(ic);
}
ic->suspending = false;
WRITE_ONCE(ic->suspending, 0);
BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));