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| author | Linus Walleij <linus.walleij@stericsson.com> | 2011-01-05 00:44:32 +0100 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-01-08 23:52:33 -0500 |
| commit | e9b86841b372de01ae865080118e29159d8b7c39 (patch) | |
| tree | c950489d3f41063fc0acc4b259ce4d4bae676d12 /drivers/mmc/core | |
| parent | 2bd6a935555b06622fa7f47a9c411b8a7812e4dc (diff) | |
| download | linux-stable-e9b86841b372de01ae865080118e29159d8b7c39.tar.gz linux-stable-e9b86841b372de01ae865080118e29159d8b7c39.tar.bz2 linux-stable-e9b86841b372de01ae865080118e29159d8b7c39.zip | |
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>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/core.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 4b1d8fb04e9b..6625c057be05 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -299,8 +299,9 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card) unsigned int timeout_us, limit_us; timeout_us = data->timeout_ns / 1000; - timeout_us += data->timeout_clks * 1000 / - (mmc_host_clk_rate(card->host) / 1000); + if (mmc_host_clk_rate(card->host)) + timeout_us += data->timeout_clks * 1000 / + (mmc_host_clk_rate(card->host) / 1000); if (data->flags & MMC_DATA_WRITE) /* |