linux-kernel - [PATCH] Bluetooth: btmtksdio: Prevent enabling interrupts after IRQ handler removal

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Message-Id: <20250312012522.53604-1-sean.wang@kernel.org>
Date: Tue, 11 Mar 2025 18:25:22 -0700
From: sean.wang@...nel.org
To: marcel@...tmann.org,
	johan.hedberg@...il.com,
	luiz.dentz@...il.com
Cc: linux-bluetooth@...r.kernel.org,
	linux-mediatek@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Sean Wang <sean.wang@...iatek.com>,
	Pedro Tsai <pedro.tsai@...iatek.com>,
	Felix Freimann <felix.freimann@...iatek.com>
Subject: [PATCH] Bluetooth: btmtksdio: Prevent enabling interrupts after IRQ handler removal

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

Ensure interrupts are not re-enabled when the IRQ handler has already been
removed. This prevents unexpected IRQ handler execution due to stale or
unhandled interrupts.

Modify btmtksdio_txrx_work to check if bdev->func->irq_handler exists
before calling sdio_writel to enable interrupts.

Co-developed-by: Pedro Tsai <pedro.tsai@...iatek.com>
Signed-off-by: Pedro Tsai <pedro.tsai@...iatek.com>
Co-developed-by: Felix Freimann <felix.freimann@...iatek.com>
Signed-off-by: Felix Freimann <felix.freimann@...iatek.com>
Signed-off-by: Sean Wang <sean.wang@...iatek.com>
---
 drivers/bluetooth/btmtksdio.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index bd5464bde174..edd5eead1e93 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -610,7 +610,8 @@ static void btmtksdio_txrx_work(struct work_struct *work)
 	} while (int_status || time_is_before_jiffies(txrx_timeout));
 
 	/* Enable interrupt */
-	sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, NULL);
+	if (bdev->func->irq_handler)
+		sdio_writel(bdev->func, C_INT_EN_SET, MTK_REG_CHLPCR, NULL);
 
 	sdio_release_host(bdev->func);
 
-- 
2.25.1