netdev - Re: [PATCH v2] net/fec_mpc52xx: Fix kernel panic on FEC error

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Message-ID: <4AD62247.4020102@grandegger.com>
Date:	Wed, 14 Oct 2009 21:11:03 +0200
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Grant Likely <grant.likely@...retlab.ca>
CC:	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	davem@...emloft.net, John Bonesio <bones@...retlab.ca>
Subject: Re: [PATCH v2] net/fec_mpc52xx: Fix kernel panic on FEC error

Grant Likely wrote:
> From: John Bonesio <bones@...retlab.ca>
> 
> The MDIO bus cannot be accessed at interrupt context, but on an FEC
> error, the fec_mpc52xx driver reset function also tries to reset the
> PHY.  Since the error is detected at IRQ context, and the PHY functions
> try to sleep, the kernel ends up panicking.
> 
> Resetting the PHY on an FEC error isn't even necessary.  This patch
> solves the problem by removing the PHY reset entirely.

There is also no need to free and re-allocate the RX buffers in
mpc52xx_fec_reset().

Wolfgang.
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