A potential data race in drivers/net/ethernet/smsc/smc91c92_cs.ko

[Pavel Andrianov]

Hi!

There is a potential data race in drivers/net/ethernet/smsc/smc91c92_cs.ko.
Regard two threads:

Thread 1 			Thread 2
				...
...				->smc_open
->smc_tx_timeout		  ->mod_timer 	
  -> smc_reset			    ->media_check - timer function
    -> smc_set_xcvr		      ->smc_set_xcvr	

In this case the struct 'smc' is modified from two threads 
simultaneously. Likely, the first thread should acquire the same 
spinlock smc->lock as the second thread in media_check.

--
Pavel Andrianov
Linux Verification Center, ISPRAS
web: http://linuxtesting.org
e-mail: andrianov@xxxxxxxxx