mmc: sdhci: fix data timeout (part 1)

commit fafcfda9e78cae8796d1799f14e6457790797555 upstream.

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>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index e0d2059e156abffb6a56a3837e54e028aaac0222..20e02d1742b1c9fbc49f147c9c15275f0096986a 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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;
        }