This is a note to let you know that I've just added the patch titled
skd: Submit requests to firmware before triggering the doorbell
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
skd-submit-requests-to-firmware-before-triggering-the-doorbell.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5fbd545cd3fd311ea1d6e8be4cedddd0ee5684c7 Mon Sep 17 00:00:00 2001
From: Bart Van Assche <bart.vanassche@xxxxxxx>
Date: Thu, 17 Aug 2017 13:12:46 -0700
Subject: skd: Submit requests to firmware before triggering the doorbell
From: Bart Van Assche <bart.vanassche@xxxxxxx>
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@xxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/block/skd_main.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -2163,6 +2163,9 @@ static void skd_send_fitmsg(struct skd_d
*/
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(stru
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);
}
Patches currently in stable-queue which might be from bart.vanassche@xxxxxxx are
queue-4.9/scsi-sg-factor-out-sg_fill_request_table.patch
queue-4.9/skd-submit-requests-to-firmware-before-triggering-the-doorbell.patch
queue-4.9/block-relax-a-check-in-blk_start_queue.patch
queue-4.9/skd-avoid-that-module-unloading-triggers-a-use-after-free.patch