linux-kernel - Re: [PATCH] usb: musb: jz4740: Prevent lockup when CONFIG

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Date:   Thu, 21 May 2020 22:39:25 +0200
From:   Paul Cercueil <paul@...pouillou.net>
To:     Bin Liu <b-liu@...com>
Cc:     od@...c.me, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: musb: jz4740: Prevent lockup when CONFIG_SMP is set

Hi Bin,

The patch it fixes was introduced in 5.7-rc1, is it possible to queue 
it for the next -rc? Otherwise I'll need to Cc it to linux-stable.

-Paul

Le jeu. 21 mai 2020 à 15:34, Bin Liu <b-liu@...com> a écrit :
> On Wed, May 20, 2020 at 05:01:11PM +0200, Paul Cercueil wrote:
>>  The function dma_controller_irq() locks up the exact same spinlock 
>> we
>>  locked before calling it, which obviously resulted in a deadlock 
>> when
>>  CONFIG_SMP was enabled. This flew under the radar as none of the 
>> boards
>>  supported by this driver needs SMP.
>> 
>>  Fixes: 57aadb46bd63 ("usb: musb: jz4740: Add support for DMA")
>>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> 
> Queued for v5.8. Thanks.
> -Bin.