[2/2] bluetooth: hci_bcm: fix freeing not-requested IRQ
diff mbox series

Message ID b46b003a5984d1f178a851a5bb2f3463d695f199.1585831987.git.mirq-linux@rere.qmqm.pl
State Accepted
Commit 81bd5d0c62437c02caac6b3f942fcda874063cb0
Headers show
Series
  • [1/2] bluetooth: hci_bcm: respect IRQ polarity from DT
Related show

Commit Message

Michał Mirosław April 2, 2020, 12:55 p.m. UTC
When BT module can't be initialized, but it has an IRQ, unloading
the driver WARNs when trying to free not-yet-requested IRQ. Fix it by
noting whether the IRQ was requested.

WARNING: CPU: 2 PID: 214 at kernel/irq/devres.c:144 devm_free_irq+0x49/0x4ca
[...]
WARNING: CPU: 2 PID: 214 at kernel/irq/manage.c:1746 __free_irq+0x8b/0x27c
Trying to free already-free IRQ 264
Modules linked in: hci_uart(-) btbcm bluetooth ecdh_generic ecc libaes
CPU: 2 PID: 214 Comm: rmmod Tainted: G        W         5.6.1mq-00044-ga5f9ea098318-dirty #928
[...]
[<b016aefb>] (devm_free_irq) from [<af8ba1ff>] (bcm_close+0x97/0x118 [hci_uart])
[<af8ba1ff>] (bcm_close [hci_uart]) from [<af8b736f>] (hci_uart_unregister_device+0x33/0x3c [hci_uart])
[<af8b736f>] (hci_uart_unregister_device [hci_uart]) from [<b035930b>] (serdev_drv_remove+0x13/0x20)
[<b035930b>] (serdev_drv_remove) from [<b037093b>] (device_release_driver_internal+0x97/0x118)
[<b037093b>] (device_release_driver_internal) from [<b0370a0b>] (driver_detach+0x2f/0x58)
[<b0370a0b>] (driver_detach) from [<b036f855>] (bus_remove_driver+0x41/0x94)
[<b036f855>] (bus_remove_driver) from [<af8ba8db>] (bcm_deinit+0x1b/0x740 [hci_uart])
[<af8ba8db>] (bcm_deinit [hci_uart]) from [<af8ba86f>] (hci_uart_exit+0x13/0x30 [hci_uart])
[<af8ba86f>] (hci_uart_exit [hci_uart]) from [<b01900bd>] (sys_delete_module+0x109/0x1d0)
[<b01900bd>] (sys_delete_module) from [<b0101001>] (ret_fast_syscall+0x1/0x5a)
[...]

Cc: stable@vger.kernel.org
Fixes: 6cc4396c8829 ("Bluetooth: hci_bcm: Add wake-up capability")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/bluetooth/hci_bcm.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Marcel Holtmann April 3, 2020, 6:41 a.m. UTC | #1
Hi Michal,

> When BT module can't be initialized, but it has an IRQ, unloading
> the driver WARNs when trying to free not-yet-requested IRQ. Fix it by
> noting whether the IRQ was requested.
> 
> WARNING: CPU: 2 PID: 214 at kernel/irq/devres.c:144 devm_free_irq+0x49/0x4ca
> [...]
> WARNING: CPU: 2 PID: 214 at kernel/irq/manage.c:1746 __free_irq+0x8b/0x27c
> Trying to free already-free IRQ 264
> Modules linked in: hci_uart(-) btbcm bluetooth ecdh_generic ecc libaes
> CPU: 2 PID: 214 Comm: rmmod Tainted: G        W         5.6.1mq-00044-ga5f9ea098318-dirty #928
> [...]
> [<b016aefb>] (devm_free_irq) from [<af8ba1ff>] (bcm_close+0x97/0x118 [hci_uart])
> [<af8ba1ff>] (bcm_close [hci_uart]) from [<af8b736f>] (hci_uart_unregister_device+0x33/0x3c [hci_uart])
> [<af8b736f>] (hci_uart_unregister_device [hci_uart]) from [<b035930b>] (serdev_drv_remove+0x13/0x20)
> [<b035930b>] (serdev_drv_remove) from [<b037093b>] (device_release_driver_internal+0x97/0x118)
> [<b037093b>] (device_release_driver_internal) from [<b0370a0b>] (driver_detach+0x2f/0x58)
> [<b0370a0b>] (driver_detach) from [<b036f855>] (bus_remove_driver+0x41/0x94)
> [<b036f855>] (bus_remove_driver) from [<af8ba8db>] (bcm_deinit+0x1b/0x740 [hci_uart])
> [<af8ba8db>] (bcm_deinit [hci_uart]) from [<af8ba86f>] (hci_uart_exit+0x13/0x30 [hci_uart])
> [<af8ba86f>] (hci_uart_exit [hci_uart]) from [<b01900bd>] (sys_delete_module+0x109/0x1d0)
> [<b01900bd>] (sys_delete_module) from [<b0101001>] (ret_fast_syscall+0x1/0x5a)
> [...]
> 
> Cc: stable@vger.kernel.org
> Fixes: 6cc4396c8829 ("Bluetooth: hci_bcm: Add wake-up capability")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
> drivers/bluetooth/hci_bcm.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel

Patch
diff mbox series

diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index 36b7f0d00c4b..19e4587f366c 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -118,6 +118,7 @@  struct bcm_device {
 	u32			oper_speed;
 	int			irq;
 	bool			irq_active_low;
+	bool			irq_acquired;
 
 #ifdef CONFIG_PM
 	struct hci_uart		*hu;
@@ -333,6 +334,8 @@  static int bcm_request_irq(struct bcm_data *bcm)
 		goto unlock;
 	}
 
+	bdev->irq_acquired = true;
+
 	device_init_wakeup(bdev->dev, true);
 
 	pm_runtime_set_autosuspend_delay(bdev->dev,
@@ -514,7 +517,7 @@  static int bcm_close(struct hci_uart *hu)
 	}
 
 	if (bdev) {
-		if (IS_ENABLED(CONFIG_PM) && bdev->irq > 0) {
+		if (IS_ENABLED(CONFIG_PM) && bdev->irq_acquired) {
 			devm_free_irq(bdev->dev, bdev->irq, bdev);
 			device_init_wakeup(bdev->dev, false);
 			pm_runtime_disable(bdev->dev);