mmc: sdhci: fix data timeout (part 1)

[ Upstream commit fafcfda9e78cae8796d1799f14e6457790797555 ]

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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index f47c4a8370bea663df69fa5a3d21e8083efb5005..3a4b01c38ec9e3d047fea4ce8d457508c2e33d28 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -681,7 +681,7 @@ 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;
        }