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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2017-08-17 13:12:46 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2017-08-18 08:45:29 -0600 |
| commit | 5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7 (patch) | |
| tree | faa32b7764ef6dbcd52e9feebb8459f7e84813f1 | |
| parent | 7277cc67b3916eed47558c64f9c9c0de00a35cda (diff) | |
| download | linux-5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7.tar.gz linux-5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7.tar.bz2 linux-5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7.zip | |
skd: Submit requests to firmware before triggering the doorbell
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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -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 edab9c04e8ad..153f20ce318b 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -2160,6 +2160,9 @@ 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); } @@ -2202,6 +2205,9 @@ 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); } |