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linux/drivers/usb/host
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Alan Stern 1e12c910ee EHCI: don't rescan interrupt QHs needlessly 
This patch (as1466) speeds up processing of ehci-hcd's periodic list.
The existing code will pointlessly rescan an interrupt endpoint queue
each time it encounters the queue's QH in the periodic list, which can
happen quite a few times if the endpoint's period is low.  On some
embedded systems, this useless overhead can waste so much time that
the driver falls hopelessly behind and loses events.

The patch introduces a "periodic_stamp" variable, which gets
incremented each time scan_periodic() runs and each time the scan
advances to a new frame.  If the corresponding stamp in an interrupt
QH is equal to the current periodic_stamp, we assume the QH has
already been scanned and skip over it.  Otherwise we scan the QH as
usual, and if none of its URBs have completed then we store the
current periodic_stamp in the QH's stamp, preventing it from being
scanned again.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-17 11:20:24 -07:00
..
whci Fix common misspellings 2011-03-31 11:26:23 -03:00
ehci-ath79.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
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 USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-dbg.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-fsl.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-fsl.h USB: ehci-fsl: add MPC5121E specific suspend and resume 2011-05-02 16:59:36 -07:00
ehci-grlib.c USB: EHCI: Add bus glue for GRLIB GRUSBHC controller 2011-05-03 11:43:48 -07:00
ehci-hcd.c USB: EHCI: Add bus glue for GRLIB GRUSBHC controller 2011-05-03 11:43:48 -07:00
ehci-hub.c USB: extend ehci-fsl and fsl_udc_core driver for OTG operation 2011-05-02 16:59:38 -07:00
ehci-ixp4xx.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
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 USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-mxc.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-octeon.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-omap.c Merge branch 2.6.39-rc7 into usb-linus 2011-05-10 13:30:45 -07:00
ehci-orion.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-pci.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-pmcmsp.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-ppc-of.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-ps3.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-q.c EHCI: don't rescan interrupt QHs needlessly 2011-05-17 11:20:24 -07:00
ehci-s5p.c USB: ehci-s5p : use __devinit and __devexit macros for probe and remove 2011-05-10 14:14:59 -07:00
ehci-sched.c EHCI: don't rescan interrupt QHs needlessly 2011-05-17 11:20:24 -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-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 USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci-xilinx-of.c USB: EHCI: Support controllers with big endian capability regs 2011-05-03 11:43:21 -07:00
ehci.h EHCI: don't rescan interrupt QHs needlessly 2011-05-17 11:20:24 -07:00
fhci-dbg.c
fhci-hcd.c Fix common misspellings 2011-03-31 11:26:23 -03:00
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
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 3.0 Hub Changes 2011-03-13 18:07:11 -07:00
isp116x.h Fix common misspellings 2011-03-31 11:26:23 -03:00
isp1362-hcd.c Fix common misspellings 2011-03-31 11:26:23 -03:00
isp1362.h
isp1760-hcd.c usb/isp1760: Report correct urb status after unlink 2011-05-02 17:07:49 -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: Add support for GRLIB GRUSBHC controller 2011-05-06 18:24:02 -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 USB: ohci: add bus glue for the Atheros AR71XX/AR7240 SoCs 2011-04-13 16:58:19 -07:00
ohci-au1xxx.c USB: ohci-au1xxx: fix warning "__BIG_ENDIAN" is not defined 2011-04-13 15:44:03 -07:00
ohci-cns3xxx.c USB: cns3xxx: Add EHCI and OHCI bus glue for cns3xxx SOCs 2010-11-29 18:32:47 +03:00
ohci-da8xx.c
ohci-dbg.c llseek: automatically add .llseek fop 2010-10-15 15:53:27 +02:00
ohci-ep93xx.c
ohci-hcd.c USB: ohci: add bus glue for the Atheros AR71XX/AR7240 SoCs 2011-04-13 16:58:19 -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 USB: Add EHCI and OHCH glue for OCTEON II SOCs. 2010-10-29 19:08:44 +01:00
ohci-omap.c
ohci-omap3.c usb: host: omap: ehci and ohci simplification 2011-03-01 17:02:49 +02:00
ohci-pci.c OHCI: fix regression caused by nVidia shutdown workaround 2011-05-17 11:20:23 -07:00
ohci-pnx4008.c i2c: Add support for custom probe function 2010-08-11 18:20:56 +02:00
ohci-pnx8550.c
ohci-ppc-of.c dt/usb: Eliminate users of of_platform_{,un}register_driver 2011-02-28 13:22:45 -07:00
ohci-ppc-soc.c
ohci-ps3.c
ohci-pxa27x.c ARM: ohci-pxa27x: enable OHCI over U2DC for pxa3xx 2010-10-08 16:21:17 +08:00
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
ohci-sh.c usb: ohci-sh: Set IRQ as shared. 2010-11-01 17:01:27 -04:00
ohci-sm501.c USB: ohci-sm501: add iounmap on error path 2010-10-22 10:21:35 -07:00
ohci-spear.c USB host: Adding USB ehci & ohci support for spear platform 2010-11-16 13:53:29 -08:00
ohci-ssb.c
ohci-tmio.c tmio: Silence warnings introduced by mfd changes 2011-03-23 10:42:01 +01:00
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 Fix common misspellings 2011-03-31 11:26:23 -03:00
oxu210hp.h
pci-quirks.c ehci: workaround for pci quirk timeout on ExoPC 2011-05-12 09:42:01 -07:00
pci-quirks.h USB host: Move AMD PLL quirk to pci-quirks.c 2011-03-01 16:01:45 -05:00
r8a66597-hcd.c USB 3.0 Hub Changes 2011-03-13 18:07:11 -07:00
r8a66597.h usb: r8a66597-hcd: Change mistake of the outsw function 2010-10-22 10:22:11 -07:00
sl811-hcd.c USB: sl811: add Kconfig option for ISOCHRONOUS mode 2011-04-13 16:26:12 -07:00
sl811.h
sl811_cs.c pcmcia: move driver name to struct pcmcia_driver 2010-09-29 17:20:24 +02:00
u132-hcd.c usb: u132-hcd: Drop __TIME__ usage 2011-04-13 16:36:06 -07:00
uhci-debug.c USB: UHCI: Wrap I/O register accesses 2011-05-06 18:24:01 -07:00
uhci-grlib.c USB: UHCI: Add support for GRLIB GRUSBHC controller 2011-05-06 18:24:02 -07:00
uhci-hcd.c USB: UHCI: Add support for GRLIB GRUSBHC controller 2011-05-06 18:24:02 -07:00
uhci-hcd.h USB: UHCI: Support non-PCI host controllers 2011-05-06 18:24:01 -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: host: uhci-q: Fixed minor coding style issues 2010-12-10 14:18:36 -08:00
xhci-dbg.c xhci: Make xHCI driver endian-safe 2011-05-02 16:42:49 -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: move the common code to a function to get max ports and port array 2011-05-12 12:54:22 -07:00
xhci-mem.c xhci: Fix memory leak in ring cache deallocation. 2011-05-16 17:59:11 -07:00
xhci-pci.c xhci-hcd: Include <linux/slab.h> in xhci-pci.c 2011-04-29 17:33:12 -07:00
xhci-ring.c xhci: Fix bug in control transfer cancellation. 2011-05-11 16:17:59 -07:00
xhci.c xhci: Fix memory leak bug when dropping endpoints 2011-05-16 17:59:22 -07:00
xhci.h xHCI 1.0: Max Exit Latency Too Large Error 2011-05-09 09:34:48 -07:00