Re: [PATCH net-next 1/2] nfc: s3fwrn5: fix order of freeing resources

From: Krzysztof Kozlowski
Date: Thu Sep 29 2022 - 03:26:50 EST


On 29/09/2022 07:04, Dmitry Torokhov wrote:
> Caution needs to be exercised when mixing together regular and managed
> resources. In case of this driver devm_request_threaded_irq() should
> not be used, because it will result in the interrupt being freed too
> late, and there being a chance that it fires up at an inopportune
> moment and reference already freed data structures.

Non-devm was so far recommended only for IRQF_SHARED, not for regular
ones. Otherwise you have to fix half of Linux kernel drivers... why is
s3fwrn5 special?

Please use scripts/get_maintainers.pl to Cc also netdev folks.

>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
> ---
> drivers/nfc/s3fwrn5/i2c.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
Best regards,
Krzysztof