mmc: mmci: Remove redundant check of status for DATA irq

We don't need to verify the content of the status register twice, while
we are about to handle a DATA irq. Instead let's leave all verification
to be handled by mmci_data_irq().

Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Russell King <linux@arm.linux.org.uk>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Cc: <stable@vger.kernel.org> # v3.15+
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 6483c5c..a723ed2 100644 (file)
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -888,6 +888,10 @@ static void
 mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
              unsigned int status)
 {
+       /* Make sure we have data to handle */
+       if (!data)
+               return;
+
        /* First check for errors */
        if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
                      MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
@@ -1206,7 +1210,6 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
 
        do {
                struct mmc_command *cmd;
-               struct mmc_data *data;
 
                status = readl(host->base + MMCISTATUS);
 
@@ -1232,11 +1235,7 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
                        MCI_CMDSENT|MCI_CMDRESPEND) && cmd)
                        mmci_cmd_irq(host, cmd, status);
 
-               data = host->data;
-               if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
-                             MCI_TXUNDERRUN|MCI_RXOVERRUN|MCI_DATAEND|
-                             MCI_DATABLOCKEND) && data)
-                       mmci_data_irq(host, data, status);
+               mmci_data_irq(host, host->data, status);
 
                /* Don't poll for busy completion in irq context. */
                if (host->busy_status)