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 8814eb6b83bfd5d28cb73cbc6e215c1e1f997916..14e118fc0097c992323a694aef3c87c0fcd3dae1 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -666,7 +666,7 @@ 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;
        }