From: Linus Walleij <linus.walleij@linaro.org>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
linux-iio <linux-iio@vger.kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Subject: Re: [PATCH v2 1/5] iio: pressure: bmp280: Tolerate IRQ before registering
Date: Fri, 27 Mar 2020 11:50:25 +0100 [thread overview]
Message-ID: <CACRpkdagNP6cY353oi0vCAihqvd2ZOHJ8Os7j-cq4EVBCC4+Ug@mail.gmail.com> (raw)
In-Reply-To: <20200323104129.60466-1-andriy.shevchenko@linux.intel.com>
On Mon, Mar 23, 2020 at 11:41 AM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
> With DEBUG_SHIRQ enabled we have a kernel crash
>
> [ 116.482696] BUG: kernel NULL pointer dereference, address: 0000000000000000
>
> ...
>
> [ 116.606571] Call Trace:
> [ 116.609023] <IRQ>
> [ 116.611047] complete+0x34/0x50
> [ 116.614206] bmp085_eoc_irq+0x9/0x10 [bmp280]
>
> because DEBUG_SHIRQ mechanism fires an IRQ before registration and drivers
> ought to be able to handle an interrupt happening before request_irq() returns.
>
> Fixes: aae953949651 ("iio: pressure: bmp280: add support for BMP085 EOC interrupt")
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> v2: put conditional logic back when re-initializing completion (Jonathan)
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Yours,
Linus Walleij
next prev parent reply other threads:[~2020-03-27 10:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-23 10:41 [PATCH v2 1/5] iio: pressure: bmp280: Tolerate IRQ before registering Andy Shevchenko
2020-03-23 10:41 ` [PATCH v2 2/5] iio: pressure: bmp280: Convert to use ->read_avail() Andy Shevchenko
2020-03-23 10:41 ` [PATCH v2 3/5] iio: pressure: bmp280: Explicitly mark GPIO optional Andy Shevchenko
2020-03-23 10:41 ` [PATCH v2 4/5] iio: pressure: bmp280: Drop unneeded explicit castings Andy Shevchenko
2020-03-23 10:41 ` [PATCH v2 5/5] iio: pressure: bmp280: Join string literals back Andy Shevchenko
2020-03-27 10:50 ` Linus Walleij [this message]
2020-03-28 16:02 ` [PATCH v2 1/5] iio: pressure: bmp280: Tolerate IRQ before registering Jonathan Cameron
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