linux-kernel - Re: [PATCH v2 1/4] net: ethernet: ti: cpdma: fix lockup in cpdma_ctlr

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Message-ID: <c33aa3f3-15e3-3a48-8a48-84b9d1e55ca5@ti.com>
Date:	Fri, 29 Jul 2016 13:46:36 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Grygorii Strashko <grygorii.strashko@...com>,
	"David S. Miller" <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] net: ethernet: ti: cpdma: fix lockup in
 cpdma_ctlr_destroy()

On Thursday 28 July 2016 11:20 PM, Grygorii Strashko wrote:
> Fix deadlock in cpdma_ctlr_destroy() which is triggered now on
> cpsw module removal:
>  cpsw_remove()
>  - cpdma_ctlr_destroy()
>    - spin_lock_irqsave(&ctlr->lock, flags)
>    - cpdma_ctlr_stop()
>      - spin_lock_irqsave(&ctlr->lock, flags);
>    - cpdma_chan_destroy()
>      - spin_lock_irqsave(&ctlr->lock, flags);
> 
> The issue has not been observed before because CPDMA channels have
> been destroyed manually by CPSW until commit d941ebe88a41 ("net:
> ethernet: ti: cpsw: use destroy ctlr to destroy channels") was merged.
> 
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>

Reviewed-by: Mugunthan V N <mugunthanvnm@...com>

Regards
Mugunthan V N