The 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".
This patch changes suspending to an int.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/md/dm-integrity.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
Index: linux-2.6/drivers/md/dm-integrity.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-integrity.c 2018-06-29 23:13:54.990000000 +0200
+++ linux-2.6/drivers/md/dm-integrity.c 2018-06-29 23:13:54.980000000 +0200
@@ -178,7 +178,7 @@ struct dm_integrity_c {
__u8 sectors_per_block;
unsigned char mode;
- bool suspending;
+ int suspending;
int failed;
@@ -2214,7 +2214,7 @@ static void dm_integrity_postsuspend(str
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);
@@ -2224,7 +2224,7 @@ static void dm_integrity_postsuspend(str
dm_integrity_flush_buffers(ic);
}
- ic->suspending = false;
+ WRITE_ONCE(ic->suspending, 0);
BUG_ON(!RB_EMPTY_ROOT(&ic->in_progress));
