linux-kernel - [PATCH v2 5/6] mmc: block: abort requests and suppress errors after undervoltage shutdown

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Message-Id: <20250220074429.2906141-6-o.rempel@pengutronix.de>
Date: Thu, 20 Feb 2025 08:44:28 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mark Brown <broonie@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Søren Andersen <san@...v.dk>,
	Christian Loehle <christian.loehle@....com>
Subject: [PATCH v2 5/6] mmc: block: abort requests and suppress errors after undervoltage shutdown

Extend the existing card removal checks in mmc_blk_mq_complete_rq() and
mmc_mq_queue_rq() to also account for the undervoltage state. If the host
has entered undervoltage shutdown, mark requests as quiet and abort them
early to prevent unnecessary retries and error logging. This ensures no
further operations are attempted on the card after an emergency stop.

Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/mmc/core/block.c | 2 +-
 drivers/mmc/core/queue.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 4830628510e6..ecb87da0e257 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2129,7 +2129,7 @@ static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
 	} else if (mqrq->retries++ < MMC_MAX_RETRIES) {
 		blk_mq_requeue_request(req, true);
 	} else {
-		if (mmc_card_removed(mq->card))
+		if (mmc_card_removed(mq->card) || mq->card->host->undervoltage)
 			req->rq_flags |= RQF_QUIET;
 		blk_mq_end_request(req, BLK_STS_IOERR);
 	}
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index ab662f502fe7..f46e01988fe8 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -239,7 +239,7 @@ static blk_status_t mmc_mq_queue_rq(struct blk_mq_hw_ctx *hctx,
 	bool get_card, cqe_retune_ok;
 	blk_status_t ret;
 
-	if (mmc_card_removed(mq->card)) {
+	if (mmc_card_removed(mq->card) || mq->card->host->undervoltage) {
 		req->rq_flags |= RQF_QUIET;
 		return BLK_STS_IOERR;
 	}
-- 
2.39.5