linux-kernel - Re: [PATCH v2] dmaengine: at_xdmac: Fix wrongfull report of a channel as in use

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Date:   Sat, 2 Feb 2019 15:55:40 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Codrin.Ciubotariu@...rochip.com
Cc:     Ludovic.Desroches@...rochip.com, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dmaengine: at_xdmac: Fix wrongfull report of a
 channel as in use

On 23-01-19, 16:33, Codrin.Ciubotariu@...rochip.com wrote:
> From: Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
> 
> atchan->status variable is used to store two different information:
>  - pass channel interrupts status from interrupt handler to tasklet;
>  - channel information like whether it is cyclic or paused;
> 
> This causes a bug when device_terminate_all() is called,
> (AT_XDMAC_CHAN_IS_CYCLIC cleared on atchan->status) and then a late End
> of Block interrupt arrives (AT_XDMAC_CIS_BIS), which sets bit 0 of
> atchan->status. Bit 0 is also used for AT_XDMAC_CHAN_IS_CYCLIC, so when
> a new descriptor for a cyclic transfer is created, the driver reports
> the channel as in use:
> 
> if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) {
> 	dev_err(chan2dev(chan), "channel currently used\n");
> 	return NULL;
> }
> 
> This patch fixes the bug by adding a different struct member to keep
> the interrupts status separated from the channel status bits.

Applied, thanks

-- 
~Vinod