[PATCH v2 6/7] atmel-mci: Don't overwrite error bits when NOTBUSY is set

[Haavard Skinnemoen]

After a data error, we wait for the NOTBUSY bit to be set so that we can
be sure the data transfer is completely finished. However, when NOTBUSY
is set, the interrupt handler copies the contents of SR into
data_status, overwriting any error bits we may have detected earlier.

To avoid this, initialize data_status to 0 before starting a request, and
don't overwrite it unless it still contains 0.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@xxxxxxxxx>
---
 drivers/mmc/host/atmel-mci.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index d45dfa2..02529af 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -694,6 +694,7 @@ static void atmci_start_request(struct atmel_mci *host,
 
 	host->pending_events = 0;
 	host->completed_events = 0;
+	host->data_status = 0;
 
 	if (host->need_reset) {
 		mci_writel(host, CR, MCI_CR_SWRST);
@@ -1408,7 +1409,8 @@ static irqreturn_t atmci_interrupt(int irq, void *dev_id)
 		if (pending & MCI_NOTBUSY) {
 			mci_writel(host, IDR,
 					ATMCI_DATA_ERROR_FLAGS | MCI_NOTBUSY);
-			host->data_status = status;
+			if (!host->data_status)
+				host->data_status = status;
 			smp_wmb();
 			atmci_set_pending(host, EVENT_DATA_COMPLETE);
 			tasklet_schedule(&host->tasklet);
-- 
1.5.6.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/