diff options
| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-17 13:12:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-09-27 14:39:21 +0200 |
| commit | 63e606bd9551852fff026c92af4026a6e3b0d245 (patch) | |
| tree | 83c5a3c577bfc189b8445ba4202c993cc2e4b326 /drivers/block | |
| parent | cb1441bca9bf23c6cf715d16843f71f8e516993d (diff) | |
skd: Submit requests to firmware before triggering the doorbell
commit 5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7 upstream.
Ensure that the members of struct skd_msg_buf have been transferred
to the PCIe adapter before the doorbell is triggered. This patch
avoids that I/O fails sporadically and that the following error
message is reported:
(skd0:STM000196603:[0000:00:09.0]): Completion mismatch comp_id=0x0000 skreq=0x0400 new=0x0000
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/skd_main.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 54ffd27b2620..6f78cea75103 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -2163,6 +2163,9 @@ static void skd_send_fitmsg(struct skd_device *skdev, */ qcmd |= FIT_QCMD_MSGSIZE_64; + /* Make sure skd_msg_buf is written before the doorbell is triggered. */ + smp_wmb(); + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); } @@ -2209,6 +2212,9 @@ static void skd_send_special_fitmsg(struct skd_device *skdev, qcmd = skspcl->mb_dma_address; qcmd |= FIT_QCMD_QID_NORMAL + FIT_QCMD_MSGSIZE_128; + /* Make sure skd_msg_buf is written before the doorbell is triggered. */ + smp_wmb(); + SKD_WRITEQ(skdev, qcmd, FIT_Q_COMMAND); } |