mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
mmc: fix division by zero in MMC core
The card is not always clocked and the clock frequency zero is perfectly legal, thus this code in mmc_set_data_timeout() may cause a division by zero. It will be triggered more often if you're using software clock gating but can be triggered under other conditions too. Reported-by: Pierre Tardy <tardyp@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Reviewed-by: Chris Ball <cjb@laptop.org> Cc: <stable@kernel.org> Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
parent
2bd6a93555
commit
e9b86841b3
1 changed files with 3 additions and 2 deletions
|
@ -299,6 +299,7 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
|
||||||
unsigned int timeout_us, limit_us;
|
unsigned int timeout_us, limit_us;
|
||||||
|
|
||||||
timeout_us = data->timeout_ns / 1000;
|
timeout_us = data->timeout_ns / 1000;
|
||||||
|
if (mmc_host_clk_rate(card->host))
|
||||||
timeout_us += data->timeout_clks * 1000 /
|
timeout_us += data->timeout_clks * 1000 /
|
||||||
(mmc_host_clk_rate(card->host) / 1000);
|
(mmc_host_clk_rate(card->host) / 1000);
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue