linux-kernel - Re: [BUG] mfd: ezx-pcap: Possible sleep-in-atomic-context bugs in pcap_adc

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Date:   Mon, 17 Sep 2018 02:03:40 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Jia-Ju Bai <baijiaju1990@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] mfd: ezx-pcap: Possible sleep-in-atomic-context bugs in
 pcap_adc_irq()

On Sat, 15 Sep 2018, Jia-Ju Bai wrote:

> 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.

Not sure what you want me to do with this.

Do you have something in mind?

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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