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mmc: sdhci: fix data timeout (part 1)

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The data timeout gives the minimum amount of time that should be
waited before timing out if no data is received from the card.
Simply dividing the nanosecond part by 1000 does not give this
required guarantee, since such a division rounds down.  Use
DIV_ROUND_UP() to give the desired timeout.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v3.15+
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Russell King 2016-01-26 13:40:58 +00:00 committed by Ulf Hansson
parent 771a3dc225
commit fafcfda9e7
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/host/sdhci.c
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@ -635,7 +635,7 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd)
if (!data)
target_timeout = cmd->busy_timeout * 1000;
else {
target_timeout = data->timeout_ns / 1000;
target_timeout = DIV_ROUND_UP(data->timeout_ns, 1000);
if (host->clock)
target_timeout += data->timeout_clks / host->clock;
}