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48df4a6fd8
linux/drivers/usb/host
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Sarah Sharp 48df4a6fd8 xhci: Handle zero-length isochronous packets. 
For a long time, the xHCI driver has had this note:
	/* FIXME: Ignoring zero-length packets, can those happen? */

It turns out that, yes, there are drivers that need to queue zero-length
transfers for isochronous OUT transfers.  Without this patch, users will
see kernel hang messages when a driver attempts to enqueue an isochronous
URB with a zero length transfer (because count_isoc_trbs_needed will return
zero for that TD, xhci_td->last_trb will never be set, and updating the
dequeue pointer will cause an infinite loop).

Matěj ran into this issue when using an NI Audio4DJ USB soundcard
with the snd-usb-caiaq driver.  See
	https://bugzilla.kernel.org/show_bug.cgi?id=40702

Fix count_isoc_trbs_needed() to return 1 for zero-length transfers (thanks
Alan on the math help).  Update the various TRB field calculations to deal
with zero-length transfers.  We're still transferring one packet with a
zero-length data payload, so the total_packet_count should be 1. The
Transfer Burst Count (TBC) and Transfer Last Burst Packet Count (TLBPC)
fields should be set to zero.

This patch should be backported to kernels as old as 2.6.36.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Matěj Laitl <matej@laitl.cz>
Cc: Daniel Mack <zonque@gmail.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@kernel.org
2011-08-16 16:46:57 -07:00
..
whci treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-ath79.c Merge branch 'master' into for-next 2011-07-11 14:15:55 +02:00
ehci-atmel.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-au1xxx.c USB: ehci-au1xxx: fix suspend callback 2011-05-06 18:16:39 -07:00
ehci-cns3xxx.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-dbg.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-fsl.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-fsl.h USB: ehci-fsl: add MPC5121E specific suspend and resume 2011-05-02 16:59:36 -07:00
ehci-grlib.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-hcd.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-07-25 23:08:32 -07:00
ehci-hub.c USB: EHCI: Fix test mode sequence 2011-08-08 12:34:47 -07:00
ehci-ixp4xx.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-lpm.c USB: Mark EHCI LPM functions as __maybe_unused 2011-02-17 10:47:55 -08:00
ehci-mem.c USB: EHCI: AMD periodic frame list table quirk 2010-11-16 13:36:40 -08:00
ehci-msm.c ehci-msm : use ehci_setup 2011-07-08 14:51:29 -07:00
ehci-mxc.c usb/ehci-mxc: add missing inclusion of mach/hardware.h 2011-08-08 12:34:45 -07:00
ehci-octeon.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-omap.c usb: host: ehci-omap: fix .remove and failure handling path of .probe(v1) 2011-08-01 22:06:48 +03:00
ehci-orion.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-pci.c Intel xhci: Support EHCI/xHCI port switching. 2011-05-27 12:07:36 -07:00
ehci-pmcmsp.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-ppc-of.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-ps3.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-q.c EHCI: fix direction handling for interrupt data toggles 2011-07-19 11:25:45 -07:00
ehci-s5p.c USB: ehci-s5p: add PM support 2011-06-06 16:32:36 -07:00
ehci-sched.c USB: EHCI: Allow users to override 80% max periodic bandwidth 2011-07-08 14:51:33 -07:00
ehci-sh.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-spear.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-sysfs.c USB: EHCI: Allow users to override 80% max periodic bandwidth 2011-07-08 14:51:33 -07:00
ehci-tegra.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-vt8500.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-w90x900.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci-xilinx-of.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ehci.h EHCI: fix direction handling for interrupt data toggles 2011-07-19 11:25:45 -07:00
fhci-dbg.c
fhci-hcd.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
fhci-hub.c
fhci-mem.c
fhci-q.c
fhci-sched.c
fhci-tds.c Fix common misspellings 2011-03-31 11:26:23 -03:00
fhci.h Fix common misspellings 2011-03-31 11:26:23 -03:00
fsl-mph-dr-of.c USB: ehci-fsl: Fix 'have_sysif_regs' detection 2011-01-22 18:38:58 -08:00
hwa-hc.c
imx21-dbg.c treewide: fix a few typos in comments 2011-05-10 10:16:21 +02:00
imx21-hcd.c Fix common misspellings 2011-03-31 11:26:23 -03:00
imx21-hcd.h USB: imx21-hcd accept arbitary transfer buffer alignement. 2010-10-22 10:22:03 -07:00
isp116x-hcd.c USB: remove remaining usages of hcd->state from usbcore and fix regression 2011-05-19 16:34:04 -07:00
isp116x.h Fix common misspellings 2011-03-31 11:26:23 -03:00
isp1362-hcd.c sanitize <linux/prefetch.h> usage 2011-05-20 12:50:29 -07:00
isp1362.h
isp1760-hcd.c usb/isp1760: Added missing call to usb_hcd_check_unlink_urb() during unlink 2011-08-08 12:34:48 -07:00
isp1760-hcd.h usb/isp1760: Improve urb queueing, get rid of BUG():s in normal code paths 2011-05-02 17:03:50 -07:00
isp1760-if.c dt/usb: Eliminate users of of_platform_{,un}register_driver 2011-02-28 13:22:45 -07:00
Kconfig USB: UHCI: Support big endian GRUSBHC HC 2011-05-19 16:45:32 -07:00
Makefile USB: Add EHCI and OHCH glue for OCTEON II SOCs. 2010-10-29 19:08:44 +01:00
octeon2-common.c usb: Configure octeon2 glue logic for proper uSOF cycle period. 2011-05-03 10:09:32 -07:00
ohci-at91.c
ohci-ath79.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-au1xxx.c USB: ohci-au1xxx: fix warning "__BIG_ENDIAN" is not defined 2011-04-13 15:44:03 -07:00
ohci-cns3xxx.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-da8xx.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-dbg.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
ohci-ep93xx.c
ohci-hcd.c USB: change maintainership of ohci-hcd and ehci-hcd 2011-06-15 17:44:56 -07:00
ohci-hub.c USB 3.0 Hub Changes 2011-03-13 18:07:11 -07:00
ohci-jz4740.c USB: ohci-jz4740: Fix spelling in MODULE_ALIAS 2010-11-11 07:14:07 -08:00
ohci-mem.c
ohci-octeon.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-omap3.c usb: host: omap: ehci and ohci simplification 2011-03-01 17:02:49 +02:00
ohci-omap.c
ohci-pci.c OHCI: fix regression caused by nVidia shutdown workaround 2011-05-17 11:20:23 -07:00
ohci-pnx4008.c
ohci-pnx8550.c
ohci-ppc-of.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-ppc-soc.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-ps3.c
ohci-pxa27x.c drivers/usb/host/ohci-pxa27x.c: add missing clk_put 2011-06-07 09:07:47 -07:00
ohci-q.c USB host: Move AMD PLL quirk to pci-quirks.c 2011-03-01 16:01:45 -05:00
ohci-s3c2410.c USB: ohci-s3c2410: return proper error if clk_get fails 2011-05-06 18:16:40 -07:00
ohci-sa1111.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-sh.c usb: update email address in ohci-sh and r8a66597-hcd 2011-07-08 14:57:12 -07:00
ohci-sm501.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci-spear.c USB host: Adding USB ehci & ohci support for spear platform 2010-11-16 13:53:29 -08:00
ohci-ssb.c Update my e-mail address 2011-07-07 15:18:01 +02:00
ohci-tmio.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
ohci.h Merge branch 'remove' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-03-16 19:05:40 -07:00
oxu210hp-hcd.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
oxu210hp.h
pci-quirks.c usb/host/pci-quirks.c: correct annotation of `ehci_dmi_nohandoff_table' 2011-08-08 14:00:14 -07:00
pci-quirks.h Intel xhci: Support EHCI/xHCI port switching. 2011-05-27 12:07:36 -07:00
r8a66597-hcd.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-07-25 23:08:32 -07:00
r8a66597.h usb: r8a66597-hcd: add function for external controller 2011-07-08 14:57:11 -07:00
sl811_cs.c pcmcia: Convert pcmcia_device_id declarations to const 2011-05-06 07:46:22 +02:00
sl811-hcd.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
sl811.h
u132-hcd.c usb: u132-hcd: Drop __TIME__ usage 2011-04-13 16:36:06 -07:00
uhci-debug.c USB: UHCI: Add support for big endian descriptors 2011-05-19 16:43:20 -07:00
uhci-grlib.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
uhci-hcd.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-05-23 12:33:02 -07:00
uhci-hcd.h USB: UHCI: Add support for big endian descriptors 2011-05-19 16:43:20 -07:00
uhci-hub.c USB: UHCI: Wrap I/O register accesses 2011-05-06 18:24:01 -07:00
uhci-pci.c USB: UHCI: Move PCI specific functions to uhci-pci.c 2011-05-06 18:24:00 -07:00
uhci-q.c USB: UHCI: Add support for big endian descriptors 2011-05-19 16:43:20 -07:00
xhci-dbg.c Merge 3.0-rc2 into usb-linus as it's needed by some USB patches 2011-06-14 06:51:23 -07:00
xhci-ext-caps.h xHCI: prolong host controller halt time limit 2011-03-13 18:07:09 -07:00
xhci-hub.c xHCI: report USB2 port in resuming as suspend 2011-08-09 14:44:50 -07:00
xhci-mem.c Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-07-25 23:08:32 -07:00
xhci-pci.c xhci: Add reset on resume quirk for asrock p67 host 2011-06-17 11:28:19 -07:00
xhci-ring.c xhci: Handle zero-length isochronous packets. 2011-08-16 16:46:57 -07:00
xhci.c xhci: Remove TDs from TD lists when URBs are canceled. 2011-08-09 14:49:25 -07:00
xhci.h Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2011-07-25 23:08:32 -07:00