em28xx list_add corruption reported by list debug

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I ran also this kind of bug. Device was PCTV 290e, which has that video unused. I have no any analog em28xx webcam to test if that happens here too.

Fortunately I found one video device which does not crash nor dump debug bug warnings. It is some old gspca webcam. Have to look example how those videobuf callbacks are implemented there..

regards
Antti


[crope@localhost linux]$ cat /dev/video0
cat: /dev/video0: Invalid argument
[crope@localhost linux]$ cat /dev/video0
cat: /dev/video0: Device or resource busy
[crope@localhost linux]$


joulu 22 00:08:24 localhost.localdomain kernel: em28174 #0: no endpoint for analog mode and transfer type 0 joulu 22 00:08:31 localhost.localdomain kernel: ------------[ cut here ]------------ joulu 22 00:08:31 localhost.localdomain kernel: WARNING: CPU: 3 PID: 6892 at lib/list_debug.c:33 __list_add+0xac/0xc0() joulu 22 00:08:31 localhost.localdomain kernel: list_add corruption. prev->next should be next (ffff88030b686498), but was (null). (prev=ffff88030c6c1748). joulu 22 00:08:31 localhost.localdomain kernel: Modules linked in: rc_pinnacle_pctv_hd(O) em28xx_rc(O) tda18271(O) cxd2820r(O) em28xx_dvb(O) r820t(O) mn88472(O) rtl2832_sd...b_usb_af901 joulu 22 00:08:31 localhost.localdomain kernel: CPU: 3 PID: 6892 Comm: cat Tainted: G C O 3.13.0-rc1+ #77 joulu 22 00:08:31 localhost.localdomain kernel: Hardware name: System manufacturer System Product Name/M5A78L-M/USB3, BIOS 1503 11/14/2012 joulu 22 00:08:31 localhost.localdomain kernel: 0000000000000009 ffff8803052afcb8 ffffffff816b8da9 ffff8803052afd00 joulu 22 00:08:31 localhost.localdomain kernel: ffff8803052afcf0 ffffffff8106bcfd ffff88030c6c5348 ffff88030b686498 joulu 22 00:08:31 localhost.localdomain kernel: ffff88030c6c1748 0000000000000292 0000000000000001 ffff8803052afd50
joulu 22 00:08:31 localhost.localdomain kernel: Call Trace:
joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff816b8da9>] dump_stack+0x4d/0x66 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff8106bcfd>] warn_slowpath_common+0x7d/0xa0 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff8106bd6c>] warn_slowpath_fmt+0x4c/0x50 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff8134c2dc>] __list_add+0xac/0xc0 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa0273a7b>] buffer_queue+0x7b/0xb0 [em28xx] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa025a2d4>] __enqueue_in_driver+0x74/0x80 [videobuf2_core] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa025c568>] vb2_streamon+0xa8/0x190 [videobuf2_core] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa025dd12>] __vb2_init_fileio+0x332/0x3a0 [videobuf2_core] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa025e733>] __vb2_perform_fileio+0x483/0x620 [videobuf2_core] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa025eae4>] vb2_fop_read+0xc4/0x5e0 [videobuf2_core] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffffa022da55>] v4l2_read+0x65/0xb0 [videodev] joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff811cc498>] vfs_read+0x98/0x170 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff811ccfdc>] SyS_read+0x4c/0xa0 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff8110affc>] ? __audit_syscall_entry+0x9c/0xf0 joulu 22 00:08:31 localhost.localdomain kernel: [<ffffffff816ca729>] system_call_fastpath+0x16/0x1b joulu 22 00:08:31 localhost.localdomain kernel: ---[ end trace dcb247cebbcc2a82 ]---



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