From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: michael.hennerich@analog.com, linus.walleij@linaro.org
Cc: linux-gpio@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] gpio: gpio-adp5588: A possible sleep-in-atomic-context bug in adp5588_gpio_direction_input()
Date: Sat, 11 Aug 2018 10:03:49 +0800 [thread overview]
Message-ID: <f741be3e-bc4d-9ea3-a2a7-d05fdc9cef5e@gmail.com> (raw)
The driver may sleep with holding a spinlock.
The function call paths (from bottom to top) in Linux-4.16 are:
[FUNC] mutex_lock_nested
drivers/gpio/gpio-adp5588.c, 113: mutex_lock_nested in
adp5588_gpio_direction_input
drivers/gpio/gpio-adp5588.c, 224: adp5588_gpio_direction_input in
adp5588_irq_set_type
kernel/irq/manage.c, 686: [FUNC_PTR]adp5588_irq_set_type in
__irq_set_trigger
kernel/irq/manage.c, 1350: __irq_set_trigger in __setup_irq
kernel/irq/manage.c, 1238: _raw_spin_lock_irqsave in __setup_irq
Note that [FUNC_PTR] means a function pointer call is used.
I do not find a good way to fix, so I only report.
This is found by my static analysis tool (DSAC).
Best wishes,
Jia-Ju Bai
next reply other threads:[~2018-08-11 2:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-11 2:03 Jia-Ju Bai [this message]
2018-08-13 11:08 ` [BUG] gpio: gpio-adp5588: A possible sleep-in-atomic-context bug in adp5588_gpio_direction_input() Michael Hennerich
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=f741be3e-bc4d-9ea3-a2a7-d05fdc9cef5e@gmail.com \
--to=baijiaju1990@gmail.com \
--cc=linus.walleij@linaro.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michael.hennerich@analog.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).