Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH 2/3] usbnet: add a mutex around phy register access | Date | Sun, 17 Sep 2006 01:03:06 +0200 |
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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.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
--- Index: linux-cg/drivers/usb/net/asix.c =================================================================== --- linux-cg.orig/drivers/usb/net/asix.c 2006-09-17 00:10:53.000000000 +0200 +++ linux-cg/drivers/usb/net/asix.c 2006-09-17 00:18:08.000000000 +0200 @@ -328,10 +328,12 @@ 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); return res & 0xffff; } @@ -348,10 +350,12 @@ struct usbnet *dev = netdev_priv(netdev); u16 res = 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); } /* same as above, but converts new value to le16 byte order before writing */ Index: linux-cg/drivers/usb/net/usbnet.c =================================================================== --- linux-cg.orig/drivers/usb/net/usbnet.c 2006-09-17 00:10:53.000000000 +0200 +++ linux-cg/drivers/usb/net/usbnet.c 2006-09-17 00:18:08.000000000 +0200 @@ -1112,6 +1112,7 @@ dev->delay.function = usbnet_bh; dev->delay.data = (unsigned long) dev; init_timer (&dev->delay); + mutex_init (&dev->phy_mutex); SET_MODULE_OWNER (net); dev->net = net; Index: linux-cg/drivers/usb/net/usbnet.h =================================================================== --- linux-cg.orig/drivers/usb/net/usbnet.h 2006-09-17 00:10:53.000000000 +0200 +++ linux-cg/drivers/usb/net/usbnet.h 2006-09-17 00:18:08.000000000 +0200 @@ -30,6 +30,7 @@ struct usb_device *udev; struct driver_info *driver_info; wait_queue_head_t *wait; + struct mutex phy_mutex; /* i/o info: pipes etc */ unsigned in, out; Index: linux-cg/drivers/usb/net/mcs7830.c =================================================================== --- linux-cg.orig/drivers/usb/net/mcs7830.c 2006-09-17 00:10:53.000000000 +0200 +++ linux-cg/drivers/usb/net/mcs7830.c 2006-09-17 00:18:08.000000000 +0200 @@ -184,6 +184,7 @@ HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index, }; + mutex_lock(&dev->phy_mutex); /* write the MII command */ ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd); if (ret < 0) @@ -208,6 +209,7 @@ dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n", index, val, i); out: + mutex_unlock(&dev->phy_mutex); return ret; } @@ -222,6 +224,8 @@ HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F), }; + mutex_lock(&dev->phy_mutex); + /* write the new register contents */ le_val = cpu_to_le16(val); ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val); @@ -248,6 +252,7 @@ dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n", index, val, i); out: + mutex_unlock(&dev->phy_mutex); return ret; } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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