From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: arnaud.pouliquen@st.com, lgirdwood@gmail.com, broonie@kernel.org,
perex@perex.cz, tiwai@suse.com
Cc: alsa-devel@alsa-project.org, LKML <linux-kernel@vger.kernel.org>
Subject: [BUG] ALSA: soc: sti: a possible sleep-in-atomic-context bug in uni_player_ctl_iec958_put()
Date: Wed, 18 Dec 2019 20:51:42 +0800 [thread overview]
Message-ID: <739176c9-d889-0093-129c-25ff9c57b63b@gmail.com> (raw)
The driver may sleep while holding a spinlock.
The function call path (from bottom to top) in Linux 4.19 is:
sound/soc/sti/uniperif_player.c, 229:
mutex_lock in uni_player_set_channel_status
sound/soc/sti/uniperif_player.c, 608:
uni_player_set_channel_status in uni_player_ctl_iec958_put
sound/soc/sti/uniperif_player.c, 603:
_raw_spin_lock_irqsave in uni_player_ctl_iec958_put
mutex_lock() can sleep at runtime.
I am not sure how to properly fix this possible bug, so I only report it.
This bug is found by a static analysis tool STCheck written by myself.
Best wishes,
Jia-Ju Bai
next reply other threads:[~2019-12-18 12:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 12:51 Jia-Ju Bai [this message]
2019-12-18 13:24 ` Arnaud POULIQUEN
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