linux-kernel - Regression: VIDIOCGMBUF ioctl hangs on bttv driver (2.6.24-rc6)

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Message-ID: <20080105223338.GA18690@vidsoft.de>
Date:	Sat, 5 Jan 2008 23:33:39 +0100
From:	Gregor Jasny <jasny@...soft.de>
To:	linux-kernel@...r.kernel.org,
	video4linux-list <video4linux-list@...hat.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	v4l-dvb-maintainer@...uxtv.org
Subject: Regression: VIDIOCGMBUF ioctl hangs on bttv driver (2.6.24-rc6)

Hi,

During some tests I've noticed that the VIDIOCGMBUF ioctl hangs on my
bttv video device. It simply does not return and the process is stuck in
the D+ state. With Kernel 2.6.22.9 the (attached) testcase works like a
charm. The V4L2 interface is working with 2.6.24, too (at least displays
xawtv the usual pixel snow).

Hard and Software:
64 bit Linux 2.6.24-rc6 (todays pull) on a Intel Core 2 Duo

WinTV PCI:
05:02.0 0400: 109e:036e (rev 02)
05:02.1 0480: 109e:0878 (rev 02)

dmesg:
Rincewind:~# dmesg |grep bttv
bttv: driver version 0.9.17 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 2) at 0000:05:02.0, irq: 23, latency: 64, mmio: 0xdfefe000
bttv0: detected: Hauppauge WinTV [card=10], PCI subsystem ID is 0070:13eb
bttv0: using: Hauppauge (bt878) [card=10,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=00ffffdb [init]
bttv0: Hauppauge/Voodoo msp34xx: reset line init [5]
bttv0: Hauppauge eeprom indicates model#61324
bttv0: tuner type=14
bttv0: i2c: checking for MSP34xx @ 0x80... found
bttv0: i2c: checking for TDA9875 @ 0xb0... not found
bttv0: i2c: checking for TDA7432 @ 0x8a... not found
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: registered device radio0
bttv0: PLL: 28636363 => 35468950 .. ok

from /proc/interrupts:
 23:      55900          0   IO-APIC-fasteoi   ehci_hcd:usb2, uhci_hcd:usb5, bttv0

If I could help with more logs, a bisection, some debug printks, please contact me.

Thanks!

Gregor

View attachment "bttvregression.c" of type "text/x-csrc" (506 bytes)