[PATCH] RFC: mmc: dw_mmc: Don't clear errors we aren't handling

[PATCH] RFC: mmc: dw_mmc: Don't clear errors we aren't handling

[Doug Anderson]

Although there are no known cases of this being a problem (and it may
be technically impossible for the hardware to report more errors once
already in the error state), it seems unwise for us to be clearing
error interrupts that we didn't actually read.

Signed-off-by: Doug Anderson <dianders@chromium.org>
---
 drivers/mmc/host/dw_mmc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 9834221..84ae704 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1583,7 +1583,8 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
 			break;
 
 		if (pending & DW_MCI_CMD_ERROR_FLAGS) {
-			mci_writel(host, RINTSTS, DW_MCI_CMD_ERROR_FLAGS);
+			mci_writel(host, RINTSTS,
+				   pending & DW_MCI_CMD_ERROR_FLAGS);
 			host->cmd_status = pending;
 			smp_wmb();
 			set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
@@ -1591,7 +1592,8 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
 
 		if (pending & DW_MCI_DATA_ERROR_FLAGS) {
 			/* if there is an error report DATA_ERROR */
-			mci_writel(host, RINTSTS, DW_MCI_DATA_ERROR_FLAGS);
+			mci_writel(host, RINTSTS,
+				   pending & DW_MCI_DATA_ERROR_FLAGS);
 			host->data_status = pending;
 			smp_wmb();
 			set_bit(EVENT_DATA_ERROR, &host->pending_events);
-- 
1.8.1.3