Patch "mmc: usdhi6rol0: handle NULL data in timeout" has been added to the 4.4-stable tree

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

mmc: usdhi6rol0: handle NULL data in timeout

to the 4.4-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-usdhi6rol0-handle-null-data-in-timeout.patch
and it can be found in the queue-4.4 subdirectory.

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

From: Rabin Vincent <[email protected]>
Date: Fri, 27 Nov 2015 12:59:11 +0100
Subject: mmc: usdhi6rol0: handle NULL data in timeout

From: Rabin Vincent <[email protected]>

commit 05caee939f8d58d81e962071da85761e1e3a4c73 upstream.

Commit bb08a7d489bd ("mmc: usdhi6rol0: fix NULL pointer deref in debug print") fixed one NULL pointer dereference but unfortunately introduced another. "data" may be NULL if this is a command timeout for a command without any data, so we should only use it if we're actually waiting for data.

---
 drivers/mmc/host/usdhi6rol0.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -1634,7 +1634,7 @@ static void usdhi6_timeout_work(struct w
 	struct usdhi6_host *host = container_of(d, struct usdhi6_host, timeout_work);
 	struct mmc_request *mrq = host->mrq;
 	struct mmc_data *data = mrq ? mrq->data : NULL;
-	struct scatterlist *sg = host->sg ?: data->sg;
+	struct scatterlist *sg;
 
 	dev_warn(mmc_dev(host->mmc),
 		 "%s timeout wait %u CMD%d: IRQ 0x%08x:0x%08x, last IRQ 0x%08x\n",

@@ -1666,6 +1666,7 @@ static void usdhi6_timeout_work(struct w
 	case USDHI6_WAIT_FOR_MWRITE:
 	case USDHI6_WAIT_FOR_READ:
 	case USDHI6_WAIT_FOR_WRITE:
+		sg = host->sg ?: data->sg;
 		dev_dbg(mmc_dev(host->mmc),
 			"%c: page #%u @ +0x%zx %ux%u in SG%u. Current SG %u bytes @ %u\n",
 			data->flags & MMC_DATA_READ ? 'R' : 'W', host->page_idx,

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

queue-4.4/mmc-usdhi6rol0-handle-null-data-in-timeout.patch