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

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Message-ID: <f0982b75-ede3-cc56-1160-8fda0faae356@linaro.org>
Date:   Thu, 29 Sep 2022 09:26:39 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Krzysztof Opasiak <k.opasiak@...sung.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] nfc: s3fwrn5: fix order of freeing resources

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@...il.com>
> ---
>  drivers/nfc/s3fwrn5/i2c.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
Best regards,
Krzysztof