diff options
| author | Matt Renzelmann <mjr@cs.wisc.edu> | 2012-04-13 07:59:40 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-04-13 14:04:47 -0400 |
| commit | 51c61a2838c33dab7b6659b9a3e008bb1b40bc9b (patch) | |
| tree | a5bb998aa71933a045d43bcca7bac5a8a78478cb | |
| parent | 59a54f3082b9847c1240e24879750e3a03f96754 (diff) | |
| download | linux-51c61a2838c33dab7b6659b9a3e008bb1b40bc9b.tar.bz2 | |
ks8851: Fix missing mutex_lock/unlock
Move the ks8851_rdreg16 call above the call to request_irq and cache
the result for subsequent repeated use. A spurious interrupt may
otherwise cause a crash. Thanks to Stephen Boyd, Flavio Leitner, and
Ben Hutchings for feedback.
Signed-off-by: Matt Renzelmann <mjr@cs.wisc.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/micrel/ks8851.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c index c722aa607d07..e5dc0757f077 100644 --- a/drivers/net/ethernet/micrel/ks8851.c +++ b/drivers/net/ethernet/micrel/ks8851.c @@ -1418,6 +1418,7 @@ static int __devinit ks8851_probe(struct spi_device *spi) struct net_device *ndev; struct ks8851_net *ks; int ret; + unsigned cider; ndev = alloc_etherdev(sizeof(struct ks8851_net)); if (!ndev) @@ -1484,8 +1485,8 @@ static int __devinit ks8851_probe(struct spi_device *spi) ks8851_soft_reset(ks, GRR_GSR); /* simple check for a valid chip being connected to the bus */ - - if ((ks8851_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) { + cider = ks8851_rdreg16(ks, KS_CIDER); + if ((cider & ~CIDER_REV_MASK) != CIDER_ID) { dev_err(&spi->dev, "failed to read device ID\n"); ret = -ENODEV; goto err_id; @@ -1516,8 +1517,7 @@ static int __devinit ks8851_probe(struct spi_device *spi) } netdev_info(ndev, "revision %d, MAC %pM, IRQ %d, %s EEPROM\n", - CIDER_REV_GET(ks8851_rdreg16(ks, KS_CIDER)), - ndev->dev_addr, ndev->irq, + CIDER_REV_GET(cider), ndev->dev_addr, ndev->irq, ks->rc_ccr & CCR_EEPROM ? "has" : "no"); return 0; |