1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/usb/net/mcs7830.c b/drivers/usb/net/mcs7830.c
index 23a80667f17e..6240b978fe3d 100644
--- a/drivers/usb/net/mcs7830.c
+++ b/drivers/usb/net/mcs7830.c
@@ -184,6 +184,7 @@ static int mcs7830_read_phy(struct usbnet *dev, u8 index)
                 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 @@ static int mcs7830_read_phy(struct usbnet *dev, u8 index)
         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 @@ static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
                 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 @@ static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
         dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
                 index, val, i);
 out:
+        mutex_unlock(&dev->phy_mutex);
         return ret;
 }