linux-kernel - [BUG] haswell: A possible sleep-in-atomic bug in hsw_irq

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Date:   Sun, 8 Oct 2017 23:06:38 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     yang.jie@...ux.intel.com, lgirdwood@...il.com, broonie@...nel.org,
        perex@...ex.cz, tiwai@...e.com
Cc:     alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] haswell: A possible sleep-in-atomic bug in hsw_irq_thread

According to sst-haswell-ipc.c, the driver may sleep under a spinlock,
and the function call path is:
hsw_irq_thread (acquire the spinlock)
   hsw_process_notification
     hsw_log_message
       mutex_lock --> may sleep

This bug is found by my static analysis tool and my code review.


Thanks,
Jia-Ju Bai