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From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: lee.jones@linaro.org
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: [BUG] mfd: ezx-pcap: Possible sleep-in-atomic-context bugs in pcap_adc_irq()
Date: Sat, 15 Sep 2018 16:50:31 +0800	[thread overview]
Message-ID: <f83a444a-1943-6c8c-5cd4-88e2acb17fa6@gmail.com> (raw)

The driver may sleep in an interrupt handler.
The function call paths (from bottom to top) in Linux-4.17 are:

[FUNC] mutex_lock_nested
drivers/mfd/ezx-pcap.c, 272:
     mutex_lock_nested in pcap_adc_irq (interrupt handler)

[FUNC] mutex_lock_nested
drivers/mfd/ezx-pcap.c, 100:
     mutex_lock_nested in ezx_pcap_read
drivers/mfd/ezx-pcap.c, 281:
     ezx_pcap_read in pcap_adc_irq (interrupt handler)

[FUNC] mutex_lock_nested
drivers/mfd/ezx-pcap.c, 85:
     mutex_lock_nested in ezx_pcap_write
drivers/mfd/ezx-pcap.c, 285:
     ezx_pcap_write in pcap_adc_irq (interrupt handler)

[FUNC] mutex_lock_nested
drivers/mfd/ezx-pcap.c, 244:
     mutex_lock_nested in pcap_adc_trigger
drivers/mfd/ezx-pcap.c, 299:
     pcap_adc_trigger in pcap_adc_irq (interrupt handler)

These bugs are found by my static analysis tool DSAC.


Best wishes,
Jia-Ju Bai

             reply	other threads:[~2018-09-15  8:50 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-15  8:50 Jia-Ju Bai [this message]
2018-09-17  1:03 ` Lee Jones
2018-09-17  2:46   ` Jia-Ju Bai
2018-10-09  9:07     ` Lee Jones
2018-10-10  7:31       ` Jia-Ju Bai

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