Patch "mmc: omap_hsmmc: Fix DTO and DCRC handling" has been added to the 4.1-stable tree

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

mmc: omap_hsmmc: Fix DTO and DCRC handling

to the 4.1-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-omap_hsmmc-fix-dto-and-dcrc-handling.patch
and it can be found in the queue-4.1 subdirectory.

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

From: Kishon Vijay Abraham I <[email protected]>
Date: Tue, 16 Jun 2015 16:07:17 +0530
Subject: mmc: omap_hsmmc: Fix DTO and DCRC handling

From: Kishon Vijay Abraham I <[email protected]>

commit 408806f740497c5d71f9c305b3d6aad260ff186d upstream.

DTO/DCRC errors were not being informed to the mmc core since commit ae4bf788ee9b ("mmc: omap_hsmmc: consolidate error report handling of HSMMC IRQ"). This commit made sure 'end_trans' is never set on DTO/DCRC errors. This is because after this commit 'host->data' is checked after it has been cleared to NULL by omap_hsmmc_dma_cleanup().

Because 'end_trans' is never set, omap_hsmmc_xfer_done() is never invoked making core layer not to be aware of DTO/DCRC errors. Because of this any command invoked after DTO/DCRC error leads to a hang.

Fix this by checking for 'host->data' before it is actually cleared.

HSMMC IRQ")

---
 drivers/mmc/host/omap_hsmmc.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

@@ -1062,6 +1062,10 @@ static void omap_hsmmc_do_irq(struct oma
 
 		if (status & (CTO_EN | CCRC_EN))
 			end_cmd = 1;
+		if (host->data || host->response_busy) {
+			end_trans = !end_cmd;
+			host->response_busy = 0;
+		}
 		if (status & (CTO_EN | DTO_EN))
 			hsmmc_command_incomplete(host, -ETIMEDOUT, end_cmd);
 		else if (status & (CCRC_EN | DCRC_EN))

@@ -1081,10 +1085,6 @@ static void omap_hsmmc_do_irq(struct oma
 			}
 			dev_dbg(mmc_dev(host->mmc), "AC12 err: 0x%x\n", ac12);
 		}
-		if (host->data || host->response_busy) {
-			end_trans = !end_cmd;
-			host->response_busy = 0;
-		}
 	}
 
 	OMAP_HSMMC_WRITE(host->base, STAT, status);

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

queue-4.1/mmc-omap_hsmmc-fix-dto-and-dcrc-handling.patch