lkml.org 
[lkml]   [2006]   [Sep]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] usbnet: add a mutex around phy register access
Date
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/

\
 
 \ /
  Last update: 2006-09-17 01:07    [W:0.082 / U:0.048 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site