linux-kernel - [PATCH 3.16 037/125] mmc: mmci: Remove redundant check of status for DATA irq

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Date:	Wed,  3 Sep 2014 15:06:34 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Peter Maydell <peter.maydell@...aro.org>,
	John Stultz <john.stultz@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 3.16 037/125] mmc: mmci: Remove redundant check of status for DATA irq

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ulf Hansson <ulf.hansson@...aro.org>

commit 1cb9da502835dad73dda772b20c1e792f4e71589 upstream.

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@...aro.org>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Russell King <linux@....linux.org.uk>
Tested-by: Kees Cook <keescook@...omium.org>
Tested-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/host/mmci.c |   11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -834,6 +834,10 @@ 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)) {
@@ -1133,7 +1137,6 @@ static irqreturn_t mmci_irq(int irq, voi
 
 	do {
 		struct mmc_command *cmd;
-		struct mmc_data *data;
 
 		status = readl(host->base + MMCISTATUS);
 
@@ -1159,11 +1162,7 @@ static irqreturn_t mmci_irq(int irq, voi
 			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)


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