Messages in this thread Patch in this message | | | From | Pavel Andrianov <> | Subject | [PATCH] smc91c92_cs : add a spinlock to avoid race condition | Date | Tue, 16 Aug 2016 16:39:06 +0300 |
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smc_reset may be executed in parallel with timer function media_check. To avoid data race in smc_set_xcvr a spinlock was added.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Pavel Andrianov <andrianov@ispras.ru> --- drivers/net/ethernet/smsc/smc91c92_cs.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/smsc/smc91c92_cs.c b/drivers/net/ethernet/smsc/smc91c92_cs.c index db3c696..69d865c 100644 --- a/drivers/net/ethernet/smsc/smc91c92_cs.c +++ b/drivers/net/ethernet/smsc/smc91c92_cs.c @@ -1637,6 +1637,7 @@ static void smc_reset(struct net_device *dev) unsigned int ioaddr = dev->base_addr; struct smc_private *smc = netdev_priv(dev); int i; + unsigned long flags; netdev_dbg(dev, "smc91c92 reset called.\n"); @@ -1647,6 +1648,7 @@ static void smc_reset(struct net_device *dev) outw(RCR_SOFTRESET, ioaddr + RCR); udelay(10); + spin_lock_irqsave(&smc->lock, flags); /* Clear the transmit and receive configuration registers. */ outw(RCR_CLEAR, ioaddr + RCR); outw(TCR_CLEAR, ioaddr + TCR); @@ -1699,6 +1701,7 @@ static void smc_reset(struct net_device *dev) SMC_SELECT_BANK(2); outw((IM_EPH_INT | IM_RX_OVRN_INT | IM_RCV_INT) << 8, ioaddr + INTERRUPT); + spin_unlock_irqrestore(&smc->lock, flags); } /*====================================================================== -- 2.7.4
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