[ldv-project] [PATCH] e1000: avoid potential deadlock in e1000_do_[read|write]_eeprom()

[Brown, Aaron F]

> From: netdev-owner at vger.kernel.org [mailto:netdev-owner at vger.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 at lists.sourceforge.net; netdev at vger.kernel.org; linux-
> kernel at vger.kernel.org; ldv-project at linuxtesting.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 at ispras.ru>

Signed-off-by: Aaron Brown <aaron.f.brown at intel.com>
Tested by: Aaron Brown <aaron.f.brown at intel.com>

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