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

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Message-ID: <20200521203422.GA25575@iaqt7>
Date:   Thu, 21 May 2020 15:34:22 -0500
From:   Bin Liu <b-liu@...com>
To:     Paul Cercueil <paul@...pouillou.net>
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

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.