4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Yibin Ding <yibin.ding@xxxxxxxxxx>
commit 4b430d4ac99750ee2ae2f893f1055c7af1ec3dc5 upstream.
For a completed request, after the mmc_blk_mq_complete_rq(mq, req)
function is executed, the bitmap_tags corresponding to the
request will be cleared, that is, the request will be regarded as
idle. If the request is acquired by a different type of process at
this time, the issue_type of the request may change. It further
caused the value of mq->in_flight[issue_type] to be abnormal,
and a large number of requests could not be sent.
p1: p2:
mmc_blk_mq_complete_rq
blk_mq_free_request
blk_mq_get_request
blk_mq_rq_ctx_init
mmc_blk_mq_dec_in_flight
mmc_issue_type(mq, req)
This strategy can ensure the consistency of issue_type
before and after executing mmc_blk_mq_complete_rq.
Fixes: 81196976ed94 ("mmc: block: Add blk-mq support")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Yibin Ding <yibin.ding@xxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230802023023.1318134-1-yunlong.xing@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/block.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1976,15 +1976,16 @@ static void mmc_blk_mq_poll_completion(s
mmc_blk_urgent_bkops(mq, mqrq);
}
-static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
+static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq,
+ struct request_queue *q,
+ enum mmc_issue_type issue_type)
{
- struct request_queue *q = req->q;
unsigned long flags;
bool put_card;
spin_lock_irqsave(q->queue_lock, flags);
- mq->in_flight[mmc_issue_type(mq, req)] -= 1;
+ mq->in_flight[issue_type] -= 1;
put_card = (mmc_tot_in_flight(mq) == 0);
@@ -1996,9 +1997,11 @@ static void mmc_blk_mq_dec_in_flight(str
static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req)
{
+ enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
struct mmc_request *mrq = &mqrq->brq.mrq;
struct mmc_host *host = mq->card->host;
+ struct request_queue *q = req->q;
mmc_post_req(host, mrq, 0);
@@ -2011,7 +2014,7 @@ static void mmc_blk_mq_post_req(struct m
else
blk_mq_complete_request(req);
- mmc_blk_mq_dec_in_flight(mq, req);
+ mmc_blk_mq_dec_in_flight(mq, q, issue_type);
}
void mmc_blk_mq_recovery(struct mmc_queue *mq)
