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Date: Thu, 15 Jan 2009 16:43:49 +0100
From: Oliver Neukum <oliver@...kum.org>
To: "Christian Eggers" <ceggers@....de>, netdev@...r.kernel.org,
linux-usb@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Subject: Re: Buffer allocation for USB transfers
Am Wednesday 14 January 2009 19:58:44 schrieb Christian Eggers:
> At least the latter does not work on my SH-4 platform. It seems that other
> variables on the stack are overwritten after calling usb_control_msg(), probably as
> result of incorrect alignment.
Does this make it run on SH-4?
Regards
Oliver
---
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -181,12 +181,17 @@ static int mcs7830_read_phy(struct usbnet *dev, u8 index)
{
int ret;
int i;
- __le16 val;
-
- u8 cmd[2] = {
- HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
- HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
- };
+ __le16 *val;
+ u8 *cmd;
+
+ cmd = kmalloc(2, GFP_NOIO);
+ if (!cmd)
+ return -ENOMEM;
+ cmd[0] = HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR;
+ cmd[1] = HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index;
+ val = kzalloc(sizeof(__le16), GFP_NOIO);
+ if (!val)
+ goto out2;
mutex_lock(&dev->phy_mutex);
/* write the MII command */
@@ -206,7 +211,7 @@ static int mcs7830_read_phy(struct usbnet *dev, u8 index)
goto out;
/* read actual register contents */
- ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
+ ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, val);
if (ret < 0)
goto out;
ret = le16_to_cpu(val);
@@ -214,6 +219,9 @@ static int mcs7830_read_phy(struct usbnet *dev, u8 index)
index, val, i);
out:
mutex_unlock(&dev->phy_mutex);
+ kfree(val);
+out2:
+ kfree(cmd);
return ret;
}
@@ -221,18 +229,24 @@ static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
{
int ret;
int i;
- __le16 le_val;
+ __le16 *le_val;
+ u8 *cmd;
+
+ cmd = kmalloc(2, GFP_NOIO);
+ if (!cmd)
+ return -ENOMEM;
+ cmd[0] = HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR;
+ cmd[1] = HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F);
- u8 cmd[2] = {
- HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
- HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
- };
+ le_val = kmalloc(sizeof(__le16), GFP_NOIO);
+ if (!le_val)
+ goto out2;
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);
+ ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, le_val);
if (ret < 0)
goto out;
@@ -257,6 +271,9 @@ static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
index, val, i);
out:
mutex_unlock(&dev->phy_mutex);
+ kfree(le_val);
+out2:
+ kfree(cmd);
return ret;
}
@@ -289,9 +306,14 @@ static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
*/
static int mcs7830_get_rev(struct usbnet *dev)
{
- u8 dummy[2];
+ u8 *dummy;
int ret;
+
+ dummy = kmalloc(2, GFP_NOIO);
+ if (!dummy)
+ return 1;
ret = mcs7830_get_reg(dev, HIF_REG_22, 2, dummy);
+ kfree(dummy);
if (ret > 0)
return 2; /* Rev C or later */
return 1; /* earlier revision */
@@ -302,17 +324,22 @@ static int mcs7830_get_rev(struct usbnet *dev)
*/
static void mcs7830_rev_C_fixup(struct usbnet *dev)
{
- u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
+ u8 *pause_threshold;
int retry;
+ pause_threshold = kmalloc(sizeof(u8), GFP_NOIO);
+ if (!pause_threshold)
+ return;
+ *pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
for (retry = 0; retry < 2; retry++) {
if (mcs7830_get_rev(dev) == 2) {
dev_info(&dev->udev->dev, "applying rev.C fixup\n");
mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
- 1, &pause_threshold);
+ 1, pause_threshold);
}
msleep(1);
}
+ kfree(pause_threshold);
}
static int mcs7830_init_dev(struct usbnet *dev)
--
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