Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-21 02:21:36 +00:00
Code Issues Packages Projects Releases Wiki Activity
314b3e0881
linux/drivers
History
Hans de Goede 314b3e0881 [media] gspca: submit interrupt urbs *after* isoc urbs 
Currently gspca supported usb-1.1 webcams for which we support the input
button through an interrupt endpoint won't stream (not enough bandwidth
error) when used through an USB-2.0 hub.

After much debugging I've found out that the cause for this is that the
ehci-sched.c schedeling code does not like it when there are already urb's
scheduled when (large) isoc urbs are queued. By moving the submission
of the interrupt urbs to after submitting the isoc urbs the camera
starts working again through usb-2.0 hubs.

Note that this does not fix isoc. streaming through a usb-hub while another
1.1 usb device (like the microphone of the same cam) is also active
at the same time :(

I've spend a long time analyzing the linux kernel ehci scheduler code,
resulting in this (long) mail:
http://www.spinics.net/lists/linux-usb/msg37982.html

The conclusion of the following mail thread is that yes there are several
issues when using usb-1.1 devices through a usb-2.0 hub, but these are not
easily fixable in the current code. Fixing this in ehci-sched.c requires
an almost full rewrite, which is not bound to happen anytime soon.

So with this patch gspca driven usb-1.1 webcams will atleast work when
connected through an usb-2.0 hub when the microphone is not used.

As an added bonus this patch avoids extra destroy/create input urb cycles
when we end up falling back to a lower speed alt setting because of bandwidth
limitations.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2010-12-29 08:16:30 -02:00
..
accessibility
acpi Merge branches 'bugzilla-25412' and 'bugzilla-25302' into release 2010-12-26 17:05:07 -05:00
amba
ata pata_cs5536: avoid implicit MSR API inclusion on x86-64 2010-12-26 19:42:15 -05:00
atm atm: correct sysfs 'device' link creation and parent relationships 2010-12-10 15:45:05 -08:00
auxdisplay
base PM: Allow devices to be removed during late suspend and early resume 2010-11-11 01:50:53 +01:00
block Fix build error in drivers/block/cciss.c 2010-12-20 21:21:49 -08:00
bluetooth Bluetooth: add NULL pointer check in HCI 2010-12-08 13:22:22 -02:00
cdrom cdrom: gdrom: ctrl_in/outX to __raw_read/writeX conversion. 2010-10-27 14:33:39 +09:00
char RAMOOPS: Don't overflow over non-allocated regions 2010-12-28 11:12:32 -08:00
clocksource clocksource: sh_cmt: Remove nested spinlock fix 2010-12-17 19:38:33 +09:00
connector connector: add module alias 2010-12-10 12:27:49 -08:00
cpufreq
cpuidle
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2010-11-13 09:55:56 -08:00
dca
dio
dma Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/djbw/async_tx 2010-12-14 13:35:47 -08:00
edac amd64_edac: Fix interleaving check 2010-12-08 19:52:54 +01:00
eisa
firewire firewire: ohci: fix regression with Agere FW643 rev 06, disable MSI 2010-12-12 15:47:02 +01:00
firmware dmi: log board, system, and BIOS information 2010-10-27 18:03:05 -07:00
gpio cs5535-gpio: handle GPIO regs where higher (clear) bits are set 2010-12-23 15:31:48 -08:00
gpu drm: Include the connector name in the output_poll_execute() debug message 2010-12-22 09:10:12 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2010-12-02 17:40:04 -08:00
hwmon Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/staging 2010-12-14 13:36:26 -08:00
i2c i2c_intel_mid: Fix slash in sysfs name 2010-12-14 18:46:01 -08:00
ide ide: clean up timed out request handling 2010-10-26 10:17:30 -07:00
idle intel_idle: recognize ARAT on WSM-EX 2010-12-02 01:19:32 -05:00
ieee802154
infiniband IB/uverbs: Handle large number of entries in poll CQ 2010-12-08 15:23:49 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2010-12-16 08:33:44 -08:00
isdn isdn: icn: Fix stack corruption bug. 2010-11-24 11:19:05 -08:00
leds led_class: fix typo in blink API 2010-12-22 19:43:34 -08:00
lguest
macintosh leds: fix up dependencies 2010-12-02 14:51:15 -08:00
mca
md Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block 2010-12-20 09:19:46 -08:00
media [media] gspca: submit interrupt urbs *after* isoc urbs 2010-12-29 08:16:30 -02:00
memstick
message SCSI host lock push-down 2010-11-16 13:33:23 -08:00
mfd mfd: Support additional parent IDs for wm831x 2010-12-22 12:05:22 +01:00
misc drivers/misc/isl29020.c: remove incorrect kfree in isl29020_remove() 2010-11-25 06:50:47 +09:00
mmc mmc: Fix re-probing with PM_POST_RESTORE notification 2010-12-21 11:46:49 -08:00
mtd Merge branch 'omap-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6 2010-12-14 17:36:35 -08:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2010-12-26 12:06:56 -08:00
nubus
of of/i2c: Fix request module by alias 2010-12-24 01:28:54 -07:00
oprofile Merge branches 'perf-fixes-for-linus' and 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2010-10-30 11:43:26 -07:00
parisc parisc: KittyHawk LCD fix 2010-12-04 11:18:25 -05:00
parport Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2010-10-24 13:41:39 -07:00
pci PCI hotplug: Fix unexpected driver unregister in pciehp_acpi.c 2010-12-23 12:51:49 -08:00
pcmcia ARM: 6456/1: Fix for building DEBUG with sa11xx_base.c as a module. 2010-12-04 12:47:48 +00:00
platform wmi: use memcmp instead of strncmp to compare GUIDs 2010-12-06 17:19:13 -05:00
pnp ACPI/PNP: avoid section mismatch warning 2010-12-11 02:01:47 -05:00
power power: Revert "power_supply: Mark twl4030_charger as broken" 2010-10-29 00:30:44 +02:00
pps
ps3
rapidio rapidio: use resource_size() 2010-11-12 07:55:30 -08:00
regulator regulator: tps6586x: correct register table 2010-12-09 09:23:43 +00:00
rtc rtc: rs5c372: fix buffer size 2010-12-22 19:43:34 -08:00
s390 [SCSI] zfcp: Issue FCP command without holding SCSI host_lock 2010-12-09 09:41:23 -06:00
sbus Merge branch 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6 2010-10-25 08:19:14 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2010-12-24 12:58:43 -08:00
serial Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb 2010-12-14 14:35:04 -08:00
sfi
sh sh: intc: Initialize radix tree gfp mask explicitly. 2010-12-24 19:38:37 +09:00
sn
spi Merge branch 'merge' of git://git.secretlab.ca/git/linux-2.6 2010-12-24 13:00:37 -08:00
ssb ssb: b43-pci-bridge: Add new vendor for BCM4318 2010-11-22 15:19:31 -05:00
staging Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6 2010-12-20 10:35:04 -08:00
tc
telephony
thermal
tty n_gsm: gsm_data_alloc buffer allocation could fail and it is not being checked 2010-12-16 13:03:13 -08:00
uio uio: Change mail address of Hans J. Koch 2010-11-10 16:57:11 -08:00
usb Merge branch 'usb-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2010-12-20 21:33:12 -08:00
uwb UWB: Return UWB_RSV_ALLOC_NOT_FOUND rather than crashing on NULL dereference if kzalloc fails 2010-11-11 07:14:07 -08:00
vhost vhost: correctly set bits of dirty pages 2010-11-29 10:26:55 +02:00
video Merge branch 'fbdev-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-2.6 2010-12-27 10:33:30 -08:00
virtio virtio: fix format of sysfs driver/vendor files 2010-11-24 15:21:12 +10:30
vlynq
w1 w1: don't allow arbitrary users to remove w1 devices 2010-10-27 18:03:17 -07:00
watchdog watchdog: Fix null pointer dereference while accessing rdc321x platform_data 2010-12-22 12:05:21 +01:00
xen Merge branch '2.6.37-rc4-pvhvm-fixes' of git://xenbits.xen.org/people/sstabellini/linux-pvhvm 2010-12-03 11:30:57 -08:00
zorro BKL: remove extraneous #include <smp_lock.h> 2010-11-17 08:59:32 -08:00
Kconfig
Makefile TTY: create drivers/tty and move the tty core files there 2010-11-05 08:10:33 -07:00