linux-kernel - Re: [PATCH 1/2] net: stmmac: Fix possible deadlock when disabling EEE support

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Message-ID: <20190626104525.GH6362@ulmo>
Date:   Wed, 26 Jun 2019 12:45:25 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Jon Hunter <jonathanh@...dia.com>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 1/2] net: stmmac: Fix possible deadlock when disabling
 EEE support

On Wed, Jun 26, 2019 at 11:23:21AM +0100, Jon Hunter wrote:
> When stmmac_eee_init() is called to disable EEE support, then the timer
> for EEE support is stopped and we return from the function. Prior to
> stopping the timer, a mutex was acquired but in this case it is never
> released and so could cause a deadlock. Fix this by releasing the mutex
> prior to returning from stmmax_eee_init() when stopping the EEE timer.
> 
> Fixes: 74371272f97f ("net: stmmac: Convert to phylink and remove phylib logic")
> Signed-off-by: Jon Hunter <jonathanh@...dia.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 1 +
>  1 file changed, 1 insertion(+)

Tested-by: Thierry Reding <treding@...dia.com>

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