[PATCH 5.17 0450/1126] Bluetooth: btmtksdio: mask out interrupt status

Greg Kroah-Hartman
2022-04-05T08:05:41Z

From: Sean Wang <sean.wang@mediatek.com>

[ Upstream commit db3f1f9b5d88d8d7f9eaa486f71784dd319285ff ]

Currently, there is a loop in btmtksdio_txrx_work() which iteratively
executes until the variable int_status is zero.

But the variable int_status should be masked out with the actual interrupt
sources (MTK_REG_CHISR bit 0-15) before we check the loop condition.
Otherwise, RX_PKT_LEN (MTK_REG_CHISR bit 16-31) which is read-only and
unclearable would cause the loop to get stuck on some chipsets like
MT7663s.

Fixes: 26270bc189ea ("Bluetooth: btmtksdio: move interrupt service to work")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/bluetooth/btmtksdio.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index 72e00264d9f1..86a52eb77e01 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -92,6 +92,7 @@ MODULE_DEVICE_TABLE(sdio, btmtksdio_table);
#define TX_EMPTY BIT(2)
#define TX_FIFO_OVERFLOW BIT(8)
#define FW_MAILBOX_INT BIT(15)
+#define INT_MASK GENMASK(15, 0)
#define RX_PKT_LEN GENMASK(31, 16)

#define MTK_REG_CSICR 0xc0
@@ -565,6 +566,7 @@ static void btmtksdio_txrx_work(struct work_struct *work)
* FIFO.
*/
sdio_writel(bdev->func, int_status, MTK_REG_CHISR, NULL);
+ int_status &= INT_MASK;

if ((int_status & FW_MAILBOX_INT) &&
bdev->data->chipid == 0x7921) {
--
2.34.1