This is a note to let you know that I've just added the patch titled
Revert "USBNET: ax88179_178a: enable tso if usb host supports sg dma"
to the 3.13-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
revert-usbnet-ax88179_178a-enable-tso-if-usb-host-supports-sg-dma.patch
and it can be found in the queue-3.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 469d417b68958a064c09e7875646c97c6e783dfc Mon Sep 17 00:00:00 2001
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Date: Fri, 7 Mar 2014 17:06:58 +0200
Subject: Revert "USBNET: ax88179_178a: enable tso if usb host supports sg dma"
From: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
commit 469d417b68958a064c09e7875646c97c6e783dfc upstream.
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@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/usb/ax88179_178a.c | 8 --------
1 file changed, 8 deletions(-)
--- a/drivers/net/usb/ax88179_178a.c
+++ b/drivers/net/usb/ax88179_178a.c
@@ -1030,20 +1030,12 @@ static int ax88179_bind(struct usbnet *d
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;
Patches currently in stable-queue which might be from mathias.nyman@xxxxxxxxxxxxxxx are
queue-3.13/revert-usbnet-ax88179_178a-enable-tso-if-usb-host-supports-sg-dma.patch
queue-3.13/revert-xhci-1.0-limit-arbitrarily-aligned-scatter-gather.patch
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