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Trent Piepho e42af83f48 V4L/DVB (5887): zr36067: Fix poll() operation 
During uncompressed capture, the poll() function was looking the wrong frame.
It was using the frame the driver was going to capture into next (pend_tail),
when it should have been looking at the next frame to be de-queued with
DQBUF/SYNC (sync_tail).

It also wasn't looking in the right spot.  It was looking at the file handle's
copy of the buffer status, rather than the driver core copy.  The interrupt
routine marks frames as done in the driver core copy, the file handle copy
isn't updated.  So even if poll() looked at the right frame, it would never
see it transition to done and return POLLIN.

The compressed capture code has this same problem, looking in fh->jpg_buffers
when it should have used zr->jpg_buffers.

There was some logic to detect when there was no current capture in process
nor any frames queued and try to return an error, which ends up being a bad
idea.  It's possible to call select() from one thread while no capture is in
process, or no frames queued, and then start a capture or queue frames from
another thread.

The buffer state variables are protected by a spin lock, which the code wasn't
acquiring.  That is fixed too.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Acked-by: Ronald S. Bultje <rbultje@ronald.bitfreak.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
 		2007-07-30 16:26:24 -03:00
..
acorn [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
acpi ACPI: restore CONFIG_ACPI_SLEEP 2007-07-29 16:53:59 -07:00
amba
…
ata Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev 2007-07-24 15:58:51 -07:00
atm [ATM]: nicstar needs virt_to_bus 2007-07-18 02:13:42 -07:00
auxdisplay Use menuconfig objects II - auxdisplay 2007-07-16 09:05:40 -07:00
base Introduce CONFIG_SUSPEND for suspend-to-Ram and standby 2007-07-29 16:45:38 -07:00
block Make lguest compile with CONFIG_BLOCK=n and CONFIG_NET=n 2007-07-29 17:37:45 -07:00
bluetooth [Bluetooth] Remove the redundant non-seekable llseek method 2007-07-11 06:53:45 +02:00
cdrom [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
char Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
clocksource x86_64: fix typo in acpi_pm.c 2007-07-21 18:37:12 -07:00
connector Use menuconfig objects: connector 2007-07-16 09:05:40 -07:00
cpufreq [CPUFREQ] Restore previously used governor on a hot-replugged CPU 2007-07-13 01:29:51 -04:00
crypto Use menuconfig objects: crypto hw 2007-07-16 09:05:40 -07:00
dio
…
dma dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs 2007-07-16 09:05:45 -07:00
edac drivers/edac: fix pasemi kconfig depends 2007-07-26 11:35:18 -07:00
eisa
…
fc4
…
firewire Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-07-22 11:36:49 -07:00
firmware edd: switch to pci_get based API 2007-07-16 09:05:42 -07:00
hid USB: add reset_resume method 2007-07-12 16:34:30 -07:00
hwmon Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6 2007-07-19 14:24:57 -07:00
i2c Replace CONFIG_SOFTWARE_SUSPEND with CONFIG_HIBERNATION 2007-07-29 16:45:38 -07:00
ide drivers/ misc __iomem annotations 2007-07-26 11:11:57 -07:00
ieee1394 raw1394 __user annotation 2007-07-26 11:11:57 -07:00
infiniband Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2007-07-29 17:22:03 -07:00
input Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 2007-07-28 19:33:04 -07:00
isdn Use menuconfig objects: ISDN/Gigaset 2007-07-21 17:49:17 -07:00
kvm KVM: disable writeback for 0x0f 0x01 instructions. 2007-07-25 14:31:27 +03:00
leds leds: Convert from struct class_device to struct device 2007-07-16 01:15:51 +01:00
lguest Make lguest compile with CONFIG_BLOCK=n and CONFIG_NET=n 2007-07-29 17:37:45 -07:00
macintosh [POWERPC] Clean up duplicate includes in drivers/macintosh/ 2007-07-22 21:31:00 +10:00
mca
…
md [BLOCK] Get rid of request_queue_t typedef 2007-07-24 09:28:11 +02:00
media V4L/DVB (5887): zr36067: Fix poll() operation 2007-07-30 16:26:24 -03:00
message Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2007-07-29 17:22:03 -07:00
mfd some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
misc Pull auto-load-modules into release branch 2007-07-25 01:36:53 -04:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2007-07-26 14:00:56 -07:00
mtd sun userflash is PCI-dependent 2007-07-26 11:11:56 -07:00
net setup and detect 2nd phy on MCF5275 in FEC driver 2007-07-30 10:52:09 -07:00
nubus some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
of Create drivers/of/platform.c 2007-07-20 14:25:51 +10:00
oprofile [CELL] oprofile: add support to OProfile for profiling CELL BE SPUs 2007-07-20 21:42:24 +02:00
parisc serial: add early_serial_setup() back to header file 2007-07-18 08:38:22 -07:00
parport m68k: exclude more unbuildable drivers 2007-07-20 08:24:49 -07:00
pci ACPI: restore CONFIG_ACPI_SLEEP 2007-07-29 16:53:59 -07:00
pcmcia [POWERPC] Constify of_platform_driver name 2007-07-22 21:30:59 +10:00
pnp ACPI: restore CONFIG_ACPI_SLEEP 2007-07-29 16:53:59 -07:00
power Merge git://git.infradead.org/battery-2.6 2007-07-15 16:56:12 -07:00
ps3
…
rapidio some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
rtc Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/cooloney/blackfin-2.6 2007-07-28 19:33:04 -07:00
s390 [S390] Fix sclp_vt220 error handling. 2007-07-27 12:29:20 +02:00
sbus [SPARC64]: Fix conflicts in SBUS/PCI/EBUS/ISA DMA handling. 2007-07-30 00:27:34 -07:00
scsi Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2007-07-29 17:22:03 -07:00
serial m68knommu: fix workqueues in 68328 serial driver 2007-07-25 11:05:01 -07:00
sh some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
sn some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
spi fixup s3c24xx build after arch moves 2007-07-26 11:35:16 -07:00
tc zs: move to the serial subsystem 2007-07-18 08:38:22 -07:00
telephony some kmalloc/memset ->kzalloc (tree wide) 2007-07-19 10:04:50 -07:00
uio UIO: Hilscher CIF card driver 2007-07-18 15:57:16 -07:00
usb Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-backlight 2007-07-22 11:19:46 -07:00
video [SPARC]: Mark SBUS framebuffer ioctls as IGNORE in compat_ioctl.c 2007-07-30 00:27:36 -07:00
w1 drivers/ misc __iomem annotations 2007-07-26 11:11:57 -07:00
xen xenbus_xs.c: fix a use-after-free 2007-07-26 11:35:17 -07:00
zorro sysfs: add parameter "struct bin_attribute *" in .read/.write methods for sysfs binary attributes 2007-07-11 16:09:09 -07:00
Kconfig Begin to consolidate of_device.c 2007-07-20 13:39:59 +10:00
Makefile Start split out of common open firmware code 2007-07-20 13:28:41 +10:00