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net: asix: Avoid looping when the device is disconnected

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From: Vincent Palatin <vpalatin@chromium.org>

Check the answers from the USB stack and avoid re-sending multiple times
the request if the device has disappeared.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Foss
2016-08-29 09:32:16 -04:00
committed by David S. Miller
parent d9fe64e511
commit 8a46f66583
2 changed files with 46 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/net/usb/asix_common.c
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@@ -428,13 +428,21 @@ int asix_mdio_read(struct net_device *netdev, int phy_id, int loc)
__le16 res;
u8 smsr;
int i = 0;
int ret;
mutex_lock(&dev->phy_mutex);
do {
asix_set_sw_mii(dev, 0);
ret = asix_set_sw_mii(dev, 0);
if (ret == -ENODEV)
break;
usleep_range(1000, 1100);
asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &smsr, 0);
} while (!(smsr & AX_HOST_EN) && (i++ < 30));
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
0, 0, 1, &smsr, 0);
} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
if (ret == -ENODEV) {
mutex_unlock(&dev->phy_mutex);
return ret;
}
asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
(__u16)loc, 2, &res, 0);
@@ -453,16 +461,24 @@ void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
__le16 res = cpu_to_le16(val);
u8 smsr;
int i = 0;
int ret;
netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
phy_id, loc, val);
mutex_lock(&dev->phy_mutex);
do {
asix_set_sw_mii(dev, 0);
ret = asix_set_sw_mii(dev, 0);
if (ret == -ENODEV)
break;
usleep_range(1000, 1100);
asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &smsr, 0);
} while (!(smsr & AX_HOST_EN) && (i++ < 30));
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
0, 0, 1, &smsr, 0);
} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
if (ret == -ENODEV) {
mutex_unlock(&dev->phy_mutex);
return;
}
asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
(__u16)loc, 2, &res, 0);
@@ -476,13 +492,21 @@ int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
__le16 res;
u8 smsr;
int i = 0;
int ret;
mutex_lock(&dev->phy_mutex);
do {
asix_set_sw_mii(dev, 1);
ret = asix_set_sw_mii(dev, 1);
if (ret == -ENODEV)
break;
usleep_range(1000, 1100);
asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &smsr, 1);
} while (!(smsr & AX_HOST_EN) && (i++ < 30));
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
0, 0, 1, &smsr, 1);
} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
if (ret == -ENODEV) {
mutex_unlock(&dev->phy_mutex);
return ret;
}
asix_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
(__u16)loc, 2, &res, 1);
@@ -502,16 +526,24 @@ asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc, int val)
__le16 res = cpu_to_le16(val);
u8 smsr;
int i = 0;
int ret;
netdev_dbg(dev->net, "asix_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
phy_id, loc, val);
mutex_lock(&dev->phy_mutex);
do {
asix_set_sw_mii(dev, 1);
ret = asix_set_sw_mii(dev, 1);
if (ret == -ENODEV)
break;
usleep_range(1000, 1100);
asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG, 0, 0, 1, &smsr, 1);
} while (!(smsr & AX_HOST_EN) && (i++ < 30));
ret = asix_read_cmd(dev, AX_CMD_STATMNGSTS_REG,
0, 0, 1, &smsr, 1);
} while (!(smsr & AX_HOST_EN) && (i++ < 30) && (ret != -ENODEV));
if (ret == -ENODEV) {
mutex_unlock(&dev->phy_mutex);
return;
}
asix_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
(__u16)loc, 2, &res, 1);