lkml.org 
[lkml]   [2020]   [Jan]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.16 42/63] mmc: mmc: fix switch timeout issue caused by jiffies precision
3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Chaotian Jing <chaotian.jing@mediatek.com>

commit 987aa5f8059613bf85cbb6f64ffbd34f5cb7a9d1 upstream.

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@mediatek.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/mmc/core/mmc_ops.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -470,7 +470,7 @@ int __mmc_switch(struct mmc_card *card,
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);
\
 
 \ /
  Last update: 2020-01-08 20:47    [W:0.237 / U:8.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site