kernel: fix arch-dependent bug in hso module

Currently, the module causes an oops at least on rt5350. These patches
have been accepted upstream at:
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37931 3c298f89-4303-0410-b956-a3cf2f4a3e73

10 files changed, 490 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.10/007-hso-Earlier-catch-of-error-condition.patch b/target/linux/generic/patches-3.10/007-hso-Earlier-catch-of-error-condition.patch
new file mode 100644
index 0000000000..9b31caf06f
--- /dev/null
+++ b/target/linux/generic/patches-3.10/007-hso-Earlier-catch-of-error-condition.patch
@@ -0,0 +1,45 @@
+From 35e57e1b49a351aa804dab6010cd46ae6112a541 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:07 -0700
+Subject: [PATCH 1/2] hso: Earlier catch of error condition
+
+There is no need to get an interface specification if we know it's the
+wrong one.
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index cba1d46..5fb36ed 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
+ 	struct hso_shared_int *shared_int;
+ 	struct hso_device *tmp_dev = NULL;
+ 
++	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
++		dev_err(&interface->dev, "Not our interface\n");
++		return -ENODEV;
++	}
++
+ 	if_num = interface->altsetting->desc.bInterfaceNumber;
+ 
+ 	/* Get the interface/port specification from either driver_info or from
+@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
+ 	else
+ 		port_spec = hso_get_config_data(interface);
+ 
+-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+-		dev_err(&interface->dev, "Not our interface\n");
+-		return -ENODEV;
+-	}
+ 	/* Check if we need to switch to alt interfaces prior to port
+ 	 * configuration */
+ 	if (interface->num_altsetting > 1)
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.10/008-hso-Fix-stack-corruption-on-some-architectures.patch b/target/linux/generic/patches-3.10/008-hso-Fix-stack-corruption-on-some-architectures.patch
new file mode 100644
index 0000000000..c6da3c1c30
--- /dev/null
+++ b/target/linux/generic/patches-3.10/008-hso-Fix-stack-corruption-on-some-architectures.patch
@@ -0,0 +1,53 @@
+From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:19 -0700
+Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
+
+As Sergei Shtylyov explained in the #mipslinux IRC channel:
+[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
+[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
+[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
+[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
+[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
+[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index 5fb36ed..86292e6 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2816,13 +2816,16 @@ exit:
+ static int hso_get_config_data(struct usb_interface *interface)
+ {
+ 	struct usb_device *usbdev = interface_to_usbdev(interface);
+-	u8 config_data[17];
++	u8 *config_data = kmalloc(17, GFP_KERNEL);
+ 	u32 if_num = interface->altsetting->desc.bInterfaceNumber;
+ 	s32 result;
+ 
++	if (!config_data)
++		return -ENOMEM;
+ 	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+ 			    0x86, 0xC0, 0, 0, config_data, 17,
+ 			    USB_CTRL_SET_TIMEOUT) != 0x11) {
++		kfree(config_data);
+ 		return -EIO;
+ 	}
+ 
+@@ -2873,6 +2876,7 @@ static int hso_get_config_data(struct usb_interface *interface)
+ 	if (config_data[16] & 0x1)
+ 		result |= HSO_INFO_CRC_BUG;
+ 
++	kfree(config_data);
+ 	return result;
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.3/007-hso-Earlier-catch-of-error-condition.patch b/target/linux/generic/patches-3.3/007-hso-Earlier-catch-of-error-condition.patch
new file mode 100644
index 0000000000..9b31caf06f
--- /dev/null
+++ b/target/linux/generic/patches-3.3/007-hso-Earlier-catch-of-error-condition.patch
@@ -0,0 +1,45 @@
+From 35e57e1b49a351aa804dab6010cd46ae6112a541 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:07 -0700
+Subject: [PATCH 1/2] hso: Earlier catch of error condition
+
+There is no need to get an interface specification if we know it's the
+wrong one.
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index cba1d46..5fb36ed 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
+ 	struct hso_shared_int *shared_int;
+ 	struct hso_device *tmp_dev = NULL;
+ 
++	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
++		dev_err(&interface->dev, "Not our interface\n");
++		return -ENODEV;
++	}
++
+ 	if_num = interface->altsetting->desc.bInterfaceNumber;
+ 
+ 	/* Get the interface/port specification from either driver_info or from
+@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
+ 	else
+ 		port_spec = hso_get_config_data(interface);
+ 
+-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+-		dev_err(&interface->dev, "Not our interface\n");
+-		return -ENODEV;
+-	}
+ 	/* Check if we need to switch to alt interfaces prior to port
+ 	 * configuration */
+ 	if (interface->num_altsetting > 1)
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.3/008-hso-Fix-stack-corruption-on-some-architectures.patch b/target/linux/generic/patches-3.3/008-hso-Fix-stack-corruption-on-some-architectures.patch
new file mode 100644
index 0000000000..c6da3c1c30
--- /dev/null
+++ b/target/linux/generic/patches-3.3/008-hso-Fix-stack-corruption-on-some-architectures.patch
@@ -0,0 +1,53 @@
+From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:19 -0700
+Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
+
+As Sergei Shtylyov explained in the #mipslinux IRC channel:
+[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
+[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
+[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
+[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
+[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
+[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index 5fb36ed..86292e6 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2816,13 +2816,16 @@ exit:
+ static int hso_get_config_data(struct usb_interface *interface)
+ {
+ 	struct usb_device *usbdev = interface_to_usbdev(interface);
+-	u8 config_data[17];
++	u8 *config_data = kmalloc(17, GFP_KERNEL);
+ 	u32 if_num = interface->altsetting->desc.bInterfaceNumber;
+ 	s32 result;
+ 
++	if (!config_data)
++		return -ENOMEM;
+ 	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+ 			    0x86, 0xC0, 0, 0, config_data, 17,
+ 			    USB_CTRL_SET_TIMEOUT) != 0x11) {
++		kfree(config_data);
+ 		return -EIO;
+ 	}
+ 
+@@ -2873,6 +2876,7 @@ static int hso_get_config_data(struct usb_interface *interface)
+ 	if (config_data[16] & 0x1)
+ 		result |= HSO_INFO_CRC_BUG;
+ 
++	kfree(config_data);
+ 	return result;
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.6/007-hso-Earlier-catch-of-error-condition.patch b/target/linux/generic/patches-3.6/007-hso-Earlier-catch-of-error-condition.patch
new file mode 100644
index 0000000000..9b31caf06f
--- /dev/null
+++ b/target/linux/generic/patches-3.6/007-hso-Earlier-catch-of-error-condition.patch
@@ -0,0 +1,45 @@
+From 35e57e1b49a351aa804dab6010cd46ae6112a541 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:07 -0700
+Subject: [PATCH 1/2] hso: Earlier catch of error condition
+
+There is no need to get an interface specification if we know it's the
+wrong one.
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index cba1d46..5fb36ed 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
+ 	struct hso_shared_int *shared_int;
+ 	struct hso_device *tmp_dev = NULL;
+ 
++	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
++		dev_err(&interface->dev, "Not our interface\n");
++		return -ENODEV;
++	}
++
+ 	if_num = interface->altsetting->desc.bInterfaceNumber;
+ 
+ 	/* Get the interface/port specification from either driver_info or from
+@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
+ 	else
+ 		port_spec = hso_get_config_data(interface);
+ 
+-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+-		dev_err(&interface->dev, "Not our interface\n");
+-		return -ENODEV;
+-	}
+ 	/* Check if we need to switch to alt interfaces prior to port
+ 	 * configuration */
+ 	if (interface->num_altsetting > 1)
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.6/008-hso-Fix-stack-corruption-on-some-architectures.patch b/target/linux/generic/patches-3.6/008-hso-Fix-stack-corruption-on-some-architectures.patch
new file mode 100644
index 0000000000..c6da3c1c30
--- /dev/null
+++ b/target/linux/generic/patches-3.6/008-hso-Fix-stack-corruption-on-some-architectures.patch
@@ -0,0 +1,53 @@
+From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:19 -0700
+Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
+
+As Sergei Shtylyov explained in the #mipslinux IRC channel:
+[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
+[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
+[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
+[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
+[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
+[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index 5fb36ed..86292e6 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2816,13 +2816,16 @@ exit:
+ static int hso_get_config_data(struct usb_interface *interface)
+ {
+ 	struct usb_device *usbdev = interface_to_usbdev(interface);
+-	u8 config_data[17];
++	u8 *config_data = kmalloc(17, GFP_KERNEL);
+ 	u32 if_num = interface->altsetting->desc.bInterfaceNumber;
+ 	s32 result;
+ 
++	if (!config_data)
++		return -ENOMEM;
+ 	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+ 			    0x86, 0xC0, 0, 0, config_data, 17,
+ 			    USB_CTRL_SET_TIMEOUT) != 0x11) {
++		kfree(config_data);
+ 		return -EIO;
+ 	}
+ 
+@@ -2873,6 +2876,7 @@ static int hso_get_config_data(struct usb_interface *interface)
+ 	if (config_data[16] & 0x1)
+ 		result |= HSO_INFO_CRC_BUG;
+ 
++	kfree(config_data);
+ 	return result;
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.8/007-hso-Earlier-catch-of-error-condition.patch b/target/linux/generic/patches-3.8/007-hso-Earlier-catch-of-error-condition.patch
new file mode 100644
index 0000000000..9b31caf06f
--- /dev/null
+++ b/target/linux/generic/patches-3.8/007-hso-Earlier-catch-of-error-condition.patch
@@ -0,0 +1,45 @@
+From 35e57e1b49a351aa804dab6010cd46ae6112a541 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:07 -0700
+Subject: [PATCH 1/2] hso: Earlier catch of error condition
+
+There is no need to get an interface specification if we know it's the
+wrong one.
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index cba1d46..5fb36ed 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
+ 	struct hso_shared_int *shared_int;
+ 	struct hso_device *tmp_dev = NULL;
+ 
++	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
++		dev_err(&interface->dev, "Not our interface\n");
++		return -ENODEV;
++	}
++
+ 	if_num = interface->altsetting->desc.bInterfaceNumber;
+ 
+ 	/* Get the interface/port specification from either driver_info or from
+@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
+ 	else
+ 		port_spec = hso_get_config_data(interface);
+ 
+-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+-		dev_err(&interface->dev, "Not our interface\n");
+-		return -ENODEV;
+-	}
+ 	/* Check if we need to switch to alt interfaces prior to port
+ 	 * configuration */
+ 	if (interface->num_altsetting > 1)
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.8/008-hso-Fix-stack-corruption-on-some-architectures.patch b/target/linux/generic/patches-3.8/008-hso-Fix-stack-corruption-on-some-architectures.patch
new file mode 100644
index 0000000000..c6da3c1c30
--- /dev/null
+++ b/target/linux/generic/patches-3.8/008-hso-Fix-stack-corruption-on-some-architectures.patch
@@ -0,0 +1,53 @@
+From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:19 -0700
+Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
+
+As Sergei Shtylyov explained in the #mipslinux IRC channel:
+[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
+[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
+[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
+[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
+[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
+[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index 5fb36ed..86292e6 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2816,13 +2816,16 @@ exit:
+ static int hso_get_config_data(struct usb_interface *interface)
+ {
+ 	struct usb_device *usbdev = interface_to_usbdev(interface);
+-	u8 config_data[17];
++	u8 *config_data = kmalloc(17, GFP_KERNEL);
+ 	u32 if_num = interface->altsetting->desc.bInterfaceNumber;
+ 	s32 result;
+ 
++	if (!config_data)
++		return -ENOMEM;
+ 	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+ 			    0x86, 0xC0, 0, 0, config_data, 17,
+ 			    USB_CTRL_SET_TIMEOUT) != 0x11) {
++		kfree(config_data);
+ 		return -EIO;
+ 	}
+ 
+@@ -2873,6 +2876,7 @@ static int hso_get_config_data(struct usb_interface *interface)
+ 	if (config_data[16] & 0x1)
+ 		result |= HSO_INFO_CRC_BUG;
+ 
++	kfree(config_data);
+ 	return result;
+ }
+ 
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.9/007-hso-Earlier-catch-of-error-condition.patch b/target/linux/generic/patches-3.9/007-hso-Earlier-catch-of-error-condition.patch
new file mode 100644
index 0000000000..9b31caf06f
--- /dev/null
+++ b/target/linux/generic/patches-3.9/007-hso-Earlier-catch-of-error-condition.patch
@@ -0,0 +1,45 @@
+From 35e57e1b49a351aa804dab6010cd46ae6112a541 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:07 -0700
+Subject: [PATCH 1/2] hso: Earlier catch of error condition
+
+There is no need to get an interface specification if we know it's the
+wrong one.
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index cba1d46..5fb36ed 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
+ 	struct hso_shared_int *shared_int;
+ 	struct hso_device *tmp_dev = NULL;
+ 
++	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
++		dev_err(&interface->dev, "Not our interface\n");
++		return -ENODEV;
++	}
++
+ 	if_num = interface->altsetting->desc.bInterfaceNumber;
+ 
+ 	/* Get the interface/port specification from either driver_info or from
+@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
+ 	else
+ 		port_spec = hso_get_config_data(interface);
+ 
+-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+-		dev_err(&interface->dev, "Not our interface\n");
+-		return -ENODEV;
+-	}
+ 	/* Check if we need to switch to alt interfaces prior to port
+ 	 * configuration */
+ 	if (interface->num_altsetting > 1)
+-- 
+1.7.9.5
+
diff --git a/target/linux/generic/patches-3.9/008-hso-Fix-stack-corruption-on-some-architectures.patch b/target/linux/generic/patches-3.9/008-hso-Fix-stack-corruption-on-some-architectures.patch
new file mode 100644
index 0000000000..c6da3c1c30
--- /dev/null
+++ b/target/linux/generic/patches-3.9/008-hso-Fix-stack-corruption-on-some-architectures.patch
@@ -0,0 +1,53 @@
+From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
+From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Date: Wed, 21 Aug 2013 01:43:19 -0700
+Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
+
+As Sergei Shtylyov explained in the #mipslinux IRC channel:
+[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
+[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
+[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
+[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
+[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
+[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
+
+Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
+Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/hso.c |    6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
+index 5fb36ed..86292e6 100644
+--- a/drivers/net/usb/hso.c
++++ b/drivers/net/usb/hso.c
+@@ -2816,13 +2816,16 @@ exit:
+ static int hso_get_config_data(struct usb_interface *interface)
+ {
+ 	struct usb_device *usbdev = interface_to_usbdev(interface);
+-	u8 config_data[17];
++	u8 *config_data = kmalloc(17, GFP_KERNEL);
+ 	u32 if_num = interface->altsetting->desc.bInterfaceNumber;
+ 	s32 result;
+ 
++	if (!config_data)
++		return -ENOMEM;
+ 	if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
+ 			    0x86, 0xC0, 0, 0, config_data, 17,
+ 			    USB_CTRL_SET_TIMEOUT) != 0x11) {
++		kfree(config_data);
+ 		return -EIO;
+ 	}
+ 
+@@ -2873,6 +2876,7 @@ static int hso_get_config_data(struct usb_interface *interface)
+ 	if (config_data[16] & 0x1)
+ 		result |= HSO_INFO_CRC_BUG;
+ 
++	kfree(config_data);
+ 	return result;
+ }
+ 
+-- 
+1.7.9.5
+