Commit 8a46f665 authored by Robert Foss's avatar Robert Foss Committed by David S. Miller
Browse files

net: asix: Avoid looping when the device is disconnected 



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: default avatarVincent Palatin <vpalatin@chromium.org>
Signed-off-by: default avatarRobert Foss <robert.foss@collabora.com>
Tested-by: default avatarRobert Foss <robert.foss@collabora.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d9fe64e5

drivers/net/usb/asix_common.c

+44 −12
Original line number Diff line number Diff line
@@ -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);

drivers/net/usb/asix_devices.c

+2 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ static u32 asix_get_phyid(struct usbnet *dev) 
	/* Poll for the rare case the FW or phy isn't ready yet.  */

	for (i = 0; i < 100; i++) {

		phy_reg = asix_mdio_read(dev->net, dev->mii.phy_id, MII_PHYSID1);

		if (phy_reg < 0)

			return 0;

		if (phy_reg != 0 && phy_reg != 0xFFFF)

			break;

		mdelay(1);

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