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| author | Frank Haverkamp <haver@linux.vnet.ibm.com> | 2014-03-20 15:11:03 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-16 12:12:38 -0700 |
| commit | 68fe8acc204c7fbefd4c01b8929fedb244ec283d (patch) | |
| tree | 51f8a953eb1505cbf9a356655ebfc770393bdc53 /drivers/misc/genwqe/card_ddcb.c | |
| parent | 5c5e0589038537848849fc827f5234a31a10f899 (diff) | |
| download | linux-stable-68fe8acc204c7fbefd4c01b8929fedb244ec283d.tar.gz linux-stable-68fe8acc204c7fbefd4c01b8929fedb244ec283d.tar.bz2 linux-stable-68fe8acc204c7fbefd4c01b8929fedb244ec283d.zip | |
GenWQE: Add wmb before DDCB is started
Needed to add wmb() before we send the DDCB for execution.
Without the syncronizing it failed on System p.
Signed-off-by: Frank Haverkamp <haver@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/genwqe/card_ddcb.c')
| -rw-r--r-- | drivers/misc/genwqe/card_ddcb.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/misc/genwqe/card_ddcb.c b/drivers/misc/genwqe/card_ddcb.c index 6f1acc0ccf88..29a1a28be02a 100644 --- a/drivers/misc/genwqe/card_ddcb.c +++ b/drivers/misc/genwqe/card_ddcb.c @@ -305,6 +305,8 @@ static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue, break; new = (old | DDCB_NEXT_BE32); + + wmb(); icrc_hsi_shi = cmpxchg(&prev_ddcb->icrc_hsi_shi_32, old, new); if (icrc_hsi_shi == old) @@ -314,6 +316,8 @@ static int enqueue_ddcb(struct genwqe_dev *cd, struct ddcb_queue *queue, /* Queue must be re-started by updating QUEUE_OFFSET */ ddcb_mark_tapped(pddcb); num = (u64)ddcb_no << 8; + + wmb(); __genwqe_writeq(cd, queue->IO_QUEUE_OFFSET, num); /* start queue */ return RET_DDCB_TAPPED; |