Fix xhci mass storage problems

0001-Revert-xhci-1.0-Limit-arbitrarily-aligned-scatter-ga.patch

@@ -0,0 +1,74 @@
+From c736d0427022a2f8eb416d930450fe22663c123c Mon Sep 17 00:00:00 2001
+From: Mathias Nyman <mathias.nyman@linux.intel.com>
+Date: Fri, 7 Mar 2014 17:06:57 +0200
+Subject: [PATCH 1/2] Revert "xhci 1.0: Limit arbitrarily-aligned scatter
+ gather."
+
+This reverts commit 247bf557273dd775505fb9240d2d152f4f20d304.
+
+This commit, together with commit 3804fad45411b48233b48003e33a78f290d227c8
+"USBNET: ax88179_178a: enable tso if usb host supports sg dma" were
+origially added to get xHCI 1.0 hosts and usb ethernet ax88179_178a devices
+working together with scatter gather. xHCI 1.0 hosts pose some requirement on how transfer
+buffers are aligned, setting this requirement for 1.0 hosts caused USB 3.0 mass
+storage devices to fail more frequently.
+
+USB 3.0 mass storage devices used to work before 3.14-rc1.  Theoretically,
+the TD fragment rules could have caused an occasional disk glitch.
+Now the devices *will* fail, instead of theoretically failing.
+>From a user perspective, this looks like a regression; the USB device obviously
+fails on 3.14-rc1, and may sometimes silently fail on prior kernels.
+
+The proper soluition is to implement the TD fragment rules required, but for now
+this patch needs to be reverted to get USB 3.0 mass storage devices working at the
+level they used to.
+
+Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
+Cc: stable <stable@vger.kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/usb/host/xhci.c | 14 +++-----------
+ 1 file changed, 3 insertions(+), 11 deletions(-)
+
+diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
+index 56d488d..5a646a6 100644
+--- a/drivers/usb/host/xhci.c
++++ b/drivers/usb/host/xhci.c
+@@ -4719,6 +4719,9 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
+ 	/* Accept arbitrarily long scatter-gather lists */
+ 	hcd->self.sg_tablesize = ~0;
+ 
++	/* support to build packet from discontinuous buffers */
++	hcd->self.no_sg_constraint = 1;
++
+ 	/* XHCI controllers don't stop the ep queue on short packets :| */
+ 	hcd->self.no_stop_on_short = 1;
+ 
+@@ -4743,14 +4746,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
+ 		/* xHCI private pointer was set in xhci_pci_probe for the second
+ 		 * registered roothub.
+ 		 */
+-		xhci = hcd_to_xhci(hcd);
+-		/*
+-		 * Support arbitrarily aligned sg-list entries on hosts without
+-		 * TD fragment rules (which are currently unsupported).
+-		 */
+-		if (xhci->hci_version < 0x100)
+-			hcd->self.no_sg_constraint = 1;
+-
+ 		return 0;
+ 	}
+ 
+@@ -4777,9 +4772,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
+ 	if (xhci->hci_version > 0x96)
+ 		xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
+ 
+-	if (xhci->hci_version < 0x100)
+-		hcd->self.no_sg_constraint = 1;
+-
+ 	/* Make sure the HC is halted. */
+ 	retval = xhci_halt(xhci);
+ 	if (retval)
+-- 
+1.9.0
+

0002-Revert-USBNET-ax88179_178a-enable-tso-if-usb-host-su.patch

@@ -0,0 +1,59 @@
+From f6e78426d8e14db98f34e1db60846c883714e5cb Mon Sep 17 00:00:00 2001
+From: Mathias Nyman <mathias.nyman@linux.intel.com>
+Date: Fri, 7 Mar 2014 17:06:58 +0200
+Subject: [PATCH 2/2] Revert "USBNET: ax88179_178a: enable tso if usb host
+ supports sg dma"
+
+This reverts commit 3804fad45411b48233b48003e33a78f290d227c8.
+
+This commit, together with commit 247bf557273dd775505fb9240d2d152f4f20d304
+"xhci 1.0: Limit arbitrarily-aligned scatter gather." were
+origially added to get xHCI 1.0 hosts and usb ethernet ax88179_178a devices
+working together with scatter gather. xHCI 1.0 hosts pose some requirement on how transfer
+buffers are aligned, setting this requirement for 1.0 hosts caused USB 3.0 mass
+storage devices to fail more frequently.
+
+USB 3.0 mass storage devices used to work before 3.14-rc1.  Theoretically,
+the TD fragment rules could have caused an occasional disk glitch.
+Now the devices *will* fail, instead of theoretically failing.
+>From a user perspective, this looks like a regression; the USB device obviously
+fails on 3.14-rc1, and may sometimes silently fail on prior kernels.
+
+The proper soluition is to implement the TD fragment rules for xHCI 1.0 hosts,
+but for now, revert this patch until scatter gather can be properly supported.
+
+Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
+Cc: stable <stable@vger.kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/net/usb/ax88179_178a.c | 8 --------
+ 1 file changed, 8 deletions(-)
+
+diff --git a/drivers/net/usb/ax88179_178a.c b/drivers/net/usb/ax88179_178a.c
+index 7056b9d..e62141b 100644
+--- a/drivers/net/usb/ax88179_178a.c
++++ b/drivers/net/usb/ax88179_178a.c
+@@ -1030,20 +1030,12 @@ static int ax88179_bind(struct usbnet *dev, struct usb_interface *intf)
+ 	dev->mii.phy_id = 0x03;
+ 	dev->mii.supports_gmii = 1;
+ 
+-	if (usb_device_no_sg_constraint(dev->udev))
+-		dev->can_dma_sg = 1;
+-
+ 	dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+ 			      NETIF_F_RXCSUM;
+ 
+ 	dev->net->hw_features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+ 				 NETIF_F_RXCSUM;
+ 
+-	if (dev->can_dma_sg) {
+-		dev->net->features |= NETIF_F_SG | NETIF_F_TSO;
+-		dev->net->hw_features |= NETIF_F_SG | NETIF_F_TSO;
+-	}
+-
+ 	/* Enable checksum offload */
+ 	*tmp = AX_RXCOE_IP | AX_RXCOE_TCP | AX_RXCOE_UDP |
+ 	       AX_RXCOE_TCPV6 | AX_RXCOE_UDPV6;
+-- 
+1.9.0
+

PKGBUILD

@@ -5,7 +5,7 @@ pkgbase=linux               # Build stock -ARCH kernel
 #pkgbase=linux-custom       # Build kernel with a different name
 _srcname=linux-3.13
 pkgver=3.13.6
-pkgrel=1
+pkgrel=2
 arch=('i686' 'x86_64')
 url="http://www.kernel.org/"
 license=('GPL2')
@@ -28,6 +28,8 @@ source=("http://www.kernel.org/pub/linux/kernel/v3.x/${_srcname}.tar.xz"
         '0001-syscalls.h-use-gcc-alias-instead-of-assembler-aliase.patch'
         '0001-Bluetooth-allocate-static-minor-for-vhci.patch'
         'i8042-fix-aliases.patch'
+        '0001-Revert-xhci-1.0-Limit-arbitrarily-aligned-scatter-ga.patch'
+        '0002-Revert-USBNET-ax88179_178a-enable-tso-if-usb-host-su.patch'
         )
 md5sums=('0ecbaf65c00374eb4a826c2f9f37606f'
          'a9b131a589a176b4c437b8ca4557b85e'
@@ -44,7 +46,9 @@ md5sums=('0ecbaf65c00374eb4a826c2f9f37606f'
          'a724515b350b29c53f20e631c6cf9a14'
          'e6fa278c092ad83780e2dd0568e24ca6'
          '06f1751777e0772c18c3fa4fbae91aa5'
-         '93dbf73af819b77f03453a9c6de2bb47')
+         '93dbf73af819b77f03453a9c6de2bb47'
+         'c753259957f6f2515c634ef99aef4a6b'
+         '53f116cdcc9635b694bc5735a36ba9d8')
 
 _kernelname=${pkgbase#linux}
 
@@ -90,6 +94,10 @@ prepare() {
   # Fix vhci warning in kmod (to restore every kernel maintainer's sanity)
   patch -p1 -i "${srcdir}/0001-Bluetooth-allocate-static-minor-for-vhci.patch"
 
+  # Fix xhci mass storage problems
+  patch -p1 -i "${srcdir}/0001-Revert-xhci-1.0-Limit-arbitrarily-aligned-scatter-ga.patch"
+  patch -p1 -i "${srcdir}/0002-Revert-USBNET-ax88179_178a-enable-tso-if-usb-host-su.patch"
+
   if [ "${CARCH}" = "x86_64" ]; then
     cat "${srcdir}/config.x86_64" > ./.config
   else