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Date: Mon, 1 Apr 2019 19:02:37 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Chaotian Jing <chaotian.jing@...iatek.com>, Ulf Hansson <ulf.hansson@...aro.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 4.4 087/131] mmc: mmc: fix switch timeout issue caused by jiffies precision 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 987aa5f8059613bf85cbb6f64ffbd34f5cb7a9d1 ] with CONFIG_HZ=100, the precision of jiffies is 10ms, and the generic_cmd6_time of some card is also 10ms. then, may be current time is only 5ms, but already timed out caused by jiffies precision. Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/mmc/core/mmc_ops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c index 1f444269ebbe..76b49b9772d0 100644 --- a/drivers/mmc/core/mmc_ops.c +++ b/drivers/mmc/core/mmc_ops.c @@ -542,7 +542,7 @@ int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value, timeout_ms = MMC_OPS_TIMEOUT_MS; /* Must check status to be sure of no errors. */ - timeout = jiffies + msecs_to_jiffies(timeout_ms); + timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1; do { if (send_status) { err = __mmc_send_status(card, &status, ignore_crc); -- 2.19.1
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