linux-kernel - Re: [PATCH] stmmac: do not sleep in atomic context for mdio

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Message-Id: <20160602.121245.1302730459604436490.davem@davemloft.net>
Date:	Thu, 02 Jun 2016 12:12:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vpalatin@...omium.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	alexandre.torgue@...com, peppe.cavallaro@...com
Subject: Re: [PATCH] stmmac: do not sleep in atomic context for mdio_reset

From: Vincent Palatin <vpalatin@...omium.org>
Date: Wed,  1 Jun 2016 08:53:48 -0700

> stmmac_mdio_reset() has been updated to use msleep rather udelay
> (as some PHY requires a one second delay there).
> It called from stmmac_resume() within the spin_lock_irqsave block
> atomic context triggering 'scheduling while atomic'.
> 
> The stmmac_priv lock usage is not fully documented, but it seems
> to protect the access to the MAC registers / DMA structures rather
> than the MDIO bus or the PHY (which have separate locking),
> so we can push the spin_lock after the stmmac_mdio_reset call.
> 
> Signed-off-by: Vincent Palatin <vpalatin@...omium.org>

Applied, thanks.