This is a note to let you know that I've just added the patch titled
xhci 1.0: Limit arbitrarily-aligned scatter gather.
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:
xhci-1.0-limit-arbitrarily-aligned-scatter-gather.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 247bf557273dd775505fb9240d2d152f4f20d304 Mon Sep 17 00:00:00 2001
From: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Date: Fri, 31 Jan 2014 11:26:25 -0800
Subject: xhci 1.0: Limit arbitrarily-aligned scatter gather.
From: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
commit 247bf557273dd775505fb9240d2d152f4f20d304 upstream.
xHCI 1.0 hosts have a set of requirements on how to align transfer
buffers on the endpoint rings called "TD fragment" rules. When the
ax88179_178a driver added support for scatter gather in 3.12, with
commit 804fad45411b48233b48003e33a78f290d227c8 "USBNET: ax88179_178a:
enable tso if usb host supports sg dma", it broke the device under xHCI
1.0 hosts. Under certain network loads, the device would see an
unexpected short packet from the host, which would cause the device to
stop sending ethernet packets, even through USB packets would still be
sent.
Commit 35773dac5f86 "usb: xhci: Link TRB must not occur within a USB
payload burst" attempted to fix this. It was a quick hack to partially
implement the TD fragment rules. However, it caused regressions in the
usb-storage layer and userspace USB drivers using libusb. The patches
to attempt to fix this are too far reaching into the USB core, and we
really need to implement the TD fragment rules correctly in the xHCI
driver, instead of continuing to wallpaper over the issues.
Disable arbitrarily-aligned scatter-gather in the xHCI driver for 1.0
hosts. Only the ax88179_178a driver checks the no_sg_constraint flag,
so don't set it for 1.0 hosts. This should not impact usb-storage or
usbfs behavior, since they pass down max packet sized aligned sg-list
entries (512 for USB 2.0 and 1024 for USB 3.0).
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Tested-by: Mark Lord <mlord@xxxxxxxxx>
Cc: David Laight <David.Laight@xxxxxxxxxx>
Cc: Bjørn Mork <bjorn@xxxxxxx>
Cc: Freddy Xin <freddy@xxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4719,9 +4719,6 @@ int xhci_gen_setup(struct usb_hcd *hcd,
/* Limit the block layer scatter-gather lists to half a segment. */
hcd->self.sg_tablesize = TRBS_PER_SEGMENT / 2;
- /* 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;
@@ -4746,6 +4743,14 @@ int xhci_gen_setup(struct usb_hcd *hcd,
/* 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;
}
@@ -4772,6 +4777,9 @@ int xhci_gen_setup(struct usb_hcd *hcd,
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)
Patches currently in stable-queue which might be from sarah.a.sharp@xxxxxxxxxxxxxxx are
queue-3.13/revert-xhci-avoid-infinite-loop-when-sg-urb-requires-too-many-trbs.patch
queue-3.13/revert-xhci-set-scatter-gather-limit-to-avoid-failed-block-writes.patch
queue-3.13/revert-usb-xhci-link-trb-must-not-occur-within-a-usb-payload-burst.patch
queue-3.13/xhci-1.0-limit-arbitrarily-aligned-scatter-gather.patch
queue-3.13/revert-usbcore-set-lpm_capable-field-for-lpm-capable-root-hubs.patch
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