David Laight 35773dac5f usb: xhci: Link TRB must not occur within a USB payload burst ... Section 4.11.7.1 of rev 1.0 of the xhci specification states that a link TRB can only occur at a boundary between underlying USB frames (512 bytes for high speed devices). If this isn't done the USB frames aren't formatted correctly and, for example, the USB3 ethernet ax88179_178a card will stop sending (while still receiving) when running a netperf tcp transmit test with (say) and 8k buffer. This should be a candidate for stable, the ax88179_178a driver defaults to gso and tso enabled so it passes a lot of fragmented skb to the USB stack. Notes from Sarah: Discussion: http://marc.info/?l=linux-usb&m=138384509604981&w=2 This patch fixes a long-standing xHCI driver bug that was revealed by a change in 3.12 in the usb-net driver. Commit 638c5115a7 "USBNET: support DMA SG" added support to use bulk endpoint scatter-gather (urb->sg). Only the USB ethernet drivers trigger this bug, because the mass storage driver sends sg list entries in page-sized chunks. This patch only fixes the issue for bulk endpoint scatter-gather. The problem will still occur for periodic endpoints, because hosts will interpret no-op transfers as a request to skip a service interval, which is not what we want. Luckily, the USB core isn't set up for scatter-gather on isochronous endpoints, and no USB drivers use scatter-gather for interrupt endpoints. Document this known limitation so that developers won't try to use urb->sg for interrupt endpoints until this issue is fixed. The more comprehensive fix would be to allow link TRBs in the middle of the endpoint ring and revert this patch, but that fix would touch too much code to be allowed in for stable. This patch should be backported to kernels as old as 3.12, that contain the commit 638c5115a7 "USBNET: support DMA SG". Without this patch, the USB network device gets wedged, and stops sending packets. Mark Lord confirms this patch fixes the regression: http://marc.info/?l=linux-netdev&m=138487107625966&w=2 Signed-off-by: David Laight <david.laight@aculab.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Tested-by: Mark Lord <mlord@pobox.com> Cc: stable@vger.kernel.org		2013-12-02 11:57:10 -08:00
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acpi	ACPI / driver core: Store an ACPI device pointer in struct acpi_dev_node	2013-11-14 23:14:43 +01:00
asm-generic	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2013-11-15 16:47:22 -08:00
clocksource
crypto	keys: change asymmetric keys to use common hash definitions	2013-10-25 17:15:18 -04:00
drm	Merge branch 'ttm-fixes-3.13' of git://people.freedesktop.org/~thomash/linux into drm-fixes	2013-11-21 18:46:56 +10:00
dt-bindings	For the 3.13 merge window we have a couple of new drivers for the AMS	2013-11-15 16:37:40 -08:00
keys
kvm
linux	usb: xhci: Link TRB must not occur within a USB payload burst	2013-12-02 11:57:10 -08:00
math-emu
media	Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux	2013-11-18 15:50:07 -08:00
memory
misc
net	genetlink: fix genl_set_err() group ID	2013-11-21 13:09:43 -05:00
pcmcia
ras
rdma	Merge branches 'cma', 'cxgb4', 'flowsteer', 'ipoib', 'misc', 'mlx4', 'mlx5', 'nes', 'ocrdma', 'qib' and 'srp' into for-next	2013-11-17 08:22:19 -08:00
rxrpc
scsi	Main batch of InfiniBand/RDMA changes for 3.13:	2013-11-18 15:36:04 -08:00
sound	Merge remote-tracking branch 'asoc/topic/twl4030' into asoc-next	2013-11-08 10:43:40 +00:00
target	target_core_alua: Store supported ALUA states	2013-11-20 11:26:37 -08:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs	2013-11-22 08:38:55 -08:00
uapi	Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux	2013-11-22 10:56:11 -08:00
video	fbdev changes for 3.13	2013-11-14 14:44:20 +09:00
xen	Features:	2013-11-15 13:34:37 +09:00
Kbuild