This is a note to let you know that I've just added the patch titled
scsi: implement .cleanup_rq callback
to the 5.3-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:
scsi-implement-.cleanup_rq-callback.patch
and it can be found in the queue-5.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From b7e9e1fb7a9227be34ad4a5e778022c3164494cf Mon Sep 17 00:00:00 2001
From: Ming Lei <[email protected]>
Date: Thu, 25 Jul 2019 10:05:00 +0800
Subject: scsi: implement .cleanup_rq callback
From: Ming Lei <[email protected]>
commit b7e9e1fb7a9227be34ad4a5e778022c3164494cf upstream.
Implement .cleanup_rq() callback for freeing driver private part
of the request. Then we can avoid to leak this part if the request isn't
completed by SCSI, and freed by blk-mq or upper layer(such as dm-rq) finally.
Cc: Ewan D. Milne <[email protected]>
Cc: Bart Van Assche <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Mike Snitzer <[email protected]>
Cc: [email protected]
Cc: <[email protected]>
Fixes: 396eaf21ee17 ("blk-mq: improve DM's blk-mq IO merging via
blk_insert_cloned_request feedback")
Signed-off-by: Ming Lei <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/scsi/scsi_lib.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1089,6 +1089,18 @@ static void scsi_initialize_rq(struct re
cmd->retries = 0;
}
+/*
+ * Only called when the request isn't completed by SCSI, and not freed by
+ * SCSI
+ */
+static void scsi_cleanup_rq(struct request *rq)
+{
+ if (rq->rq_flags & RQF_DONTPREP) {
+ scsi_mq_uninit_cmd(blk_mq_rq_to_pdu(rq));
+ rq->rq_flags &= ~RQF_DONTPREP;
+ }
+}
+
/* Add a command to the list used by the aacraid and dpt_i2o drivers */
void scsi_add_cmd_to_list(struct scsi_cmnd *cmd)
{
@@ -1821,6 +1833,7 @@ static const struct blk_mq_ops scsi_mq_o
.init_request = scsi_mq_init_request,
.exit_request = scsi_mq_exit_request,
.initialize_rq_fn = scsi_initialize_rq,
+ .cleanup_rq = scsi_cleanup_rq,
.busy = scsi_mq_lld_busy,
.map_queues = scsi_map_queues,
};
Patches currently in stable-queue which might be from [email protected] are
queue-5.3/scsi-implement-.cleanup_rq-callback.patch
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