From: Sergey Senozhatsky <senozhatsky@chromium.org>
Date: Wed, 25 Jun 2025 05:20:37 +0000 (+0900)
Subject: mtk-sd: reset host->mrq on prepare_data() error
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ec54c0a20709ed6e56f40a8d59eee725c31a916b;p=thirdparty%2Fkernel%2Flinux.git

mtk-sd: reset host->mrq on prepare_data() error

Do not leave host with dangling ->mrq pointer if we hit
the msdc_prepare_data() error out path.

Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Fixes: f5de469990f1 ("mtk-sd: Prevent memory corruption from DMA map failure")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250625052106.584905-1-senozhatsky@chromium.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index b12cfb9a5e5f..d7020e06dd55 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -1492,6 +1492,7 @@ static void msdc_ops_request(struct mmc_host *mmc, struct mmc_request *mrq)
 	if (mrq->data) {
 		msdc_prepare_data(host, mrq->data);
 		if (!msdc_data_prepared(mrq->data)) {
+			host->mrq = NULL;
 			/*
 			 * Failed to prepare DMA area, fail fast before
 			 * starting any commands.