[PATCH 1/4] mmc: sunxi: Report manual stop errors correctly

[Jernej Skrabec]

When a data transfer fails, sunxi_mmc_finalize_request() sets the stop
command error to -ETIMEDOUT and the threaded interrupt handler sends a
manual stop command. This has two problems:

- If the manual stop command succeeds, its response is stored, but the
  provisional -ETIMEDOUT error is left in place. The request thus
  completes with a stop command error that didn't happen, and as the
  block layer only checks the card status in the stop response when
  the stop command didn't fail, errors reported there are ignored.
- If the manual stop command fails, -ETIMEDOUT is stored in the
  response instead of in the error field. The block layer then decodes
  it as an R1 card status with random error bits set.

Store the error of a failed stop command in the error field, and clear
the provisional error when the manual stop command succeeds.

Fixes: 3cbcb16095f9 ("mmc: sunxi: Add driver for SD/MMC hosts found on Allwinner sunxi SoCs")
Signed-off-by: Jernej Skrabec <jernej.skrabec@xxxxxxxxx>
---
 drivers/mmc/host/sunxi-mmc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index fe4c0f6d73f3..9744b6b860ac 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -470,10 +470,12 @@ static void sunxi_mmc_send_manual_stop(struct sunxi_mmc_host *host,
 	if (!(ri & SDXC_COMMAND_DONE) || (ri & SDXC_INTERRUPT_ERROR_BIT)) {
 		dev_err(mmc_dev(host->mmc), "send stop command failed\n");
 		if (req->stop)
-			req->stop->resp[0] = -ETIMEDOUT;
+			req->stop->error = -ETIMEDOUT;
 	} else {
-		if (req->stop)
+		if (req->stop) {
 			req->stop->resp[0] = mmc_readl(host, REG_RESP0);
+			req->stop->error = 0;
+		}
 	}
 
 	mmc_writel(host, REG_RINTR, 0xffff);
-- 
2.43.0