[PATCH 2/4] mmc: sdhci: Fix unexpected data interrupt handling

[Adrian Hunter <adrian.hunter@intel.com>]

In the busy response case (i.e. !host->data), an unexpected data interrupt
would result in clearing the data command as though it had completed but
without informing the upper layers and thus resulting in a hang.  Fix by
only clearing the data command for data interrupts that are expected.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org # v4.8+
---
 drivers/mmc/host/sdhci.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ad135d4449e6..e7e1a70645e3 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2518,9 +2518,6 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 	if (!host->data) {
 		struct mmc_command *data_cmd = host->data_cmd;
 
-		if (data_cmd)
-			host->data_cmd = NULL;
-
 		/*
 		 * The "data complete" interrupt is also used to
 		 * indicate that a busy state has ended. See comment
@@ -2528,11 +2525,13 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
 		 */
 		if (data_cmd && (data_cmd->flags & MMC_RSP_BUSY)) {
 			if (intmask & SDHCI_INT_DATA_TIMEOUT) {
+				host->data_cmd = NULL;
 				data_cmd->error = -ETIMEDOUT;
 				sdhci_finish_mrq(host, data_cmd->mrq);
 				return;
 			}
 			if (intmask & SDHCI_INT_DATA_END) {
+				host->data_cmd = NULL;
 				/*
 				 * Some cards handle busy-end interrupt
 				 * before the command completed, so make
-- 
1.9.1