linux-kernel - RE: [PATCH] e1000: avoid potential deadlock in e1000_do_[read|write]

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Message-ID: <309B89C4C689E141A5FF6A0C5FB2118B73129684@ORSMSX101.amr.corp.intel.com>
Date:	Sat, 11 Jan 2014 03:35:25 +0000
From:	"Brown, Aaron F" <aaron.f.brown@...el.com>
To:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
CC:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>,
	"Skidmore, Donald C" <donald.c.skidmore@...el.com>,
	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	"Duyck, Alexander H" <alexander.h.duyck@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ldv-project@...uxtesting.org" <ldv-project@...uxtesting.org>
Subject: RE: [PATCH] e1000: avoid potential deadlock in
 e1000_do_[read|write]_eeprom()

> From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
> On Behalf Of Alexey Khoroshilov
> Sent: Friday, December 20, 2013 2:25 PM
> To: Kirsher, Jeffrey T
> Cc: Alexey Khoroshilov; Brandeburg, Jesse; Allan, Bruce W; Wyborny,
> Carolyn; Skidmore, Donald C; Rose, Gregory V; Duyck, Alexander H; Ronciak,
> John; e1000-devel@...ts.sourceforge.net; netdev@...r.kernel.org; linux-
> kernel@...r.kernel.org; ldv-project@...uxtesting.org
> Subject: [PATCH] e1000: avoid potential deadlock in
> e1000_do_[read|write]_eeprom()
> 
> If eeprom->word_size is zero, e1000_do_[read|write]_eeprom() invoke
> e1000_init_eeprom_params() to reinit eeprom params.
> That is not a good idea since e1000_init_eeprom_params() calls
> e1000_read_eeprom() if eeprom->type is e1000_eeprom_spi.
> That means a deadlock on e1000_eeprom_lock.
> 
> At the same time it is unclear if the reinit is needed at all.
> e1000_init_eeprom_params() is called from probe, so it should succeed
> before any activities of the module start.
> 
> The patch suggests to remove the try to reinit eeprom params.
> 
> Found by Linux Driver Verification project (linuxtesting.org).
> 
> Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>

Signed-off-by: Aaron Brown <aaron.f.brown@...el.com>
Tested by: Aaron Brown <aaron.f.brown@...el.com>

> ---
>  drivers/net/ethernet/intel/e1000/e1000_hw.c | 8 --------
>  1 file changed, 8 deletions(-)

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