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| author | Arnd Bergmann <arnd@arndb.de> | 2006-10-09 00:08:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-17 14:46:32 -0700 |
| commit | a9fc6338bd51a3d5735839e756fe7b741c2e6fad (patch) | |
| tree | 0c75d1739bd65f21b125562dd9f603b1d195dd8c /drivers/usb/net/asix.c | |
| parent | c41286fd42f3545513f8de9f61028120b6d38e89 (diff) | |
| download | lwn-a9fc6338bd51a3d5735839e756fe7b741c2e6fad.tar.gz lwn-a9fc6338bd51a3d5735839e756fe7b741c2e6fad.zip | |
usbnet: add a mutex around phy register access
When working on the mcs7830, I noticed the need for a mutex in its
mdio_read/mdio_write functions. A related problem seems to be present
in the asix driver in the respective functions.
This introduces a mutex in the common usbnet driver and uses it
from the two hardware specific drivers.
Acked-by: David Hollis <dhollis@davehollis.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/net/asix.c')
| -rw-r--r-- | drivers/usb/net/asix.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/net/asix.c b/drivers/usb/net/asix.c index 5edd0534c7ab..881841e600de 100644 --- a/drivers/usb/net/asix.c +++ b/drivers/usb/net/asix.c @@ -569,10 +569,12 @@ static int asix_mdio_read(struct net_device *netdev, int phy_id, int loc) struct usbnet *dev = netdev_priv(netdev); u16 res; + mutex_lock(&dev->phy_mutex); asix_set_sw_mii(dev); asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id, (__u16)loc, 2, (u16 *)&res); asix_set_hw_mii(dev); + mutex_unlock(&dev->phy_mutex); devdbg(dev, "asix_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x", phy_id, loc, le16_to_cpu(res & 0xffff)); @@ -586,10 +588,12 @@ asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val) u16 res = cpu_to_le16(val); devdbg(dev, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x", phy_id, loc, val); + mutex_lock(&dev->phy_mutex); asix_set_sw_mii(dev); asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id, (__u16)loc, 2, (u16 *)&res); asix_set_hw_mii(dev); + mutex_unlock(&dev->phy_mutex); } /* Get the PHY Identifier from the PHYSID1 & PHYSID2 MII registers */ |