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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>
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1 changed files with 3 additions and 2 deletions
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@ -299,6 +299,7 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
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unsigned int timeout_us, limit_us;
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unsigned int timeout_us, limit_us;
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timeout_us = data->timeout_ns / 1000;
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timeout_us = data->timeout_ns / 1000;
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if (mmc_host_clk_rate(card->host))
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timeout_us += data->timeout_clks * 1000 /
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timeout_us += data->timeout_clks * 1000 /
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(mmc_host_clk_rate(card->host) / 1000);
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(mmc_host_clk_rate(card->host) / 1000);
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