mmc: omap_hsmmc: Fix DTO and DCRC handling

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.

Fixes: ae4bf788ee9b ("mmc: omap_hsmmc: consolidate error report handling of
HSMMC IRQ")

CC: stable@vger.kernel.org
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
Tested-by: Andreas Fenkart <afenkart@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index b2b411d..0132ba7 100644 (file)
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1062,6 +1062,10 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
 
                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 omap_hsmmc_host *host, int status)
                        }
                        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);