netdev - Re: [PATCH] isdn: Fix a sleep-in-atomic bug

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Date:   Wed, 31 May 2017 14:38:46 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     baijiaju1990@....com
Cc:     isdn@...ux-pingi.de, geliangtang@...il.com, keescook@...omium.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] isdn: Fix a sleep-in-atomic bug

From: Jia-Ju Bai <baijiaju1990@....com>
Date: Wed, 31 May 2017 09:40:11 +0800

> The driver may sleep under a spin lock, the function call path is:
> isdn_ppp_mp_receive (acquire the lock)
>   isdn_ppp_mp_reassembly
>     isdn_ppp_push_higher
>       isdn_ppp_decompress
>         isdn_ppp_ccp_reset_trans
>           isdn_ppp_ccp_reset_alloc_state
>             kzalloc(GFP_KERNEL) --> may sleep
> 
> To fixed it, the "GFP_KERNEL" is replaced with "GFP_ATOMIC".
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>

Applied.