[PATCH v2 2/3] Bluetooth: btmtksdio: test for bug IO errors in btmtksdio_txrx_work()

[Sergey Senozhatsky]

btmtksdio_txrx_work() loop termination condition checks for
int_status being non-zero, however, this evaluates to true
even when sdio_readl() encounters BUS I/O error (in which
case int_status is 0xffffffff).  Break out of the loop if
sdio_readl() errors out.

Fixes: 26270bc189ea4 ("Bluetooth: btmtksdio: move interrupt service to work")
Cc: stable at vger.kernel.org
Signed-off-by: Sergey Senozhatsky <senozhatsky at chromium.org>
---
 drivers/bluetooth/btmtksdio.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index c6f80c419e90..d8c8d2857527 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -574,7 +574,9 @@ static void btmtksdio_txrx_work(struct work_struct *work)
 	txrx_timeout = jiffies + 5 * HZ;
 
 	do {
-		int_status = sdio_readl(bdev->func, MTK_REG_CHISR, NULL);
+		int_status = sdio_readl(bdev->func, MTK_REG_CHISR, &err);
+		if (err < 0 || int_status == 0xffffffff)
+			break;
 
 		/* Ack an interrupt as soon as possible before any operation on
 		 * hardware.
-- 
2.54.0.1136.gdb2ca164c4-goog