Patch "mmc: sdhci: Fix unexpected data interrupt handling" has been added to the 4.8-stable tree

This is a note to let you know that I've just added the patch titled

mmc: sdhci: Fix unexpected data interrupt handling

to the 4.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mmc-sdhci-fix-unexpected-data-interrupt-handling.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Adrian Hunter <[email protected]>
Date: Wed, 2 Nov 2016 15:49:09 +0200
Subject: mmc: sdhci: Fix unexpected data interrupt handling

From: Adrian Hunter <[email protected]>

commit 69b962a65a547690a356f9f76bc4f53db538ac49 upstream.

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.

---
 drivers/mmc/host/sdhci.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

@@ -2509,9 +2509,6 @@ static void sdhci_data_irq(struct sdhci_
 	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

@@ -2519,11 +2516,13 @@ static void sdhci_data_irq(struct sdhci_
 		 */
 		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

Patches currently in stable-queue which might be from [email protected] are

queue-4.8/mmc-sdhci-fix-cmd-line-reset-interfering-with-ongoing-data-transfer.patch queue-4.8/mmc-sdhci-fix-unexpected-data-interrupt-handling.patch