From f92e04f764b86e55e522988e6f4b6082d19a2721 Mon Sep 17 00:00:00 2001
From: Fengnan Chang <fengnanchang@gmail.com>
Date: Sat, 23 Jan 2021 11:32:31 +0800
Subject: [PATCH] mmc: core: Limit retries when analyse of SDIO tuples fails
Git-commit: f92e04f764b86e55e522988e6f4b6082d19a2721
Patch-mainline: v5.11-rc7
References: git-fixes
When analysing tuples fails we may loop indefinitely to retry. Let's avoid
this by using a 10s timeout and bail if not completed earlier.
Signed-off-by: Fengnan Chang <fengnanchang@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210123033230.36442-1-fengnanchang@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mmc/core/sdio_cis.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index 44bea5e4aeda..b23773583179 100644
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c
@@ -20,6 +20,8 @@
#include "sdio_cis.h"
#include "sdio_ops.h"
+#define SDIO_READ_CIS_TIMEOUT_MS (10 * 1000) /* 10s */
+
static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
const unsigned char *buf, unsigned size)
{
@@ -274,6 +276,8 @@ static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
do {
unsigned char tpl_code, tpl_link;
+ unsigned long timeout = jiffies +
+ msecs_to_jiffies(SDIO_READ_CIS_TIMEOUT_MS);
ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code);
if (ret)
@@ -326,6 +330,8 @@ static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func)
prev = &this->next;
if (ret == -ENOENT) {
+ if (time_after(jiffies, timeout))
+ break;
/* warn about unknown tuples */
pr_warn_ratelimited("%s: queuing unknown"
" CIS tuple 0x%02x (%u bytes)\n",
--
2.26.2