[PATCH v2] mmc: limit the time of retries when analyse tuples failed
From: Fengnan Chang <hidden>
Date: 2021-01-20 17:31:56
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
when analyse tuples failed, may enter an endless loop，so limit the time of retries. Signed-off-by: Fengnan Chang <redacted> --- drivers/mmc/core/sdio_cis.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index dcb3dee59fa5..47423a6d13fb 100644
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c@@ -266,6 +266,7 @@ static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func) do { unsigned char tpl_code, tpl_link; + u64 timeout = get_jiffies_64() + 10 * HZ; ret = mmc_io_rw_direct(card, 0, 0, ptr++, 0, &tpl_code); if (ret)
@@ -318,6 +319,8 @@ static int sdio_read_cis(struct mmc_card *card, struct sdio_func *func) prev = &this->next; if (ret == -ENOENT) { + if (time_after64(get_jiffies_64(), timeout)) + break; /* warn about unknown tuples */ pr_warn_ratelimited("%s: queuing unknown" " CIS tuple 0x%02x (%u bytes)\n", --
2.25.1