linux-kernel - Re: Missing additional V4L2 caps in cx18

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Message-ID: <5539E945.3070603@xs4all.nl>
Date:	Fri, 24 Apr 2015 08:57:09 +0200
From:	Hans Verkuil <hverkuil@...all.nl>
To:	Laura Abbott <labbott@...hat.com>,
	Andy Walls <awalls@...metrocast.net>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
CC:	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	quantum.analyst@...il.com
Subject: Re: Missing additional V4L2 caps in cx18

Hi Laura,

Thanks for the report. I've made a patch and CC-ed you on it.
The TS and IDX streams are internal (i.e., they do not map to a V4L2
device node), but the PCM stream isn't, and that's the one causing the
warning.

Regards,

	Hans

On 04/23/2015 07:57 PM, Laura Abbott wrote:
> Hi,
> 
> We received a report of a backtrace from v4l2 with
> the cx18 module:
> 
> 
> [    6.229393] ------------[ cut here ]------------
> [    6.229414] WARNING: CPU: 1 PID: 593 at 
> drivers/media/v4l2-core/v4l2-ioctl.c:1025 v4l_querycap+0x41/0x70 
> [videodev]()
> [    6.229415] Modules linked in: cx18_alsa mxl5005s s5h1409 
> tuner_simple tuner_types cs5345 tuner intel_rapl iosf_mbi 
> x86_pkg_temp_thermal coretemp raid1 snd_hda_codec_realtek kvm_intel 
> snd_hda_codec_generic snd_hda_codec_hdmi kvm snd_oxygen(+) snd_hda_intel 
> snd_oxygen_lib snd_hda_controller snd_hda_codec snd_mpu401_uart iTCO_wdt 
> snd_rawmidi iTCO_vendor_support snd_hwdep crct10dif_pclmul crc32_pclmul 
> crc32c_intel snd_seq cx18 snd_seq_device ghash_clmulni_intel 
> videobuf_vmalloc tveeprom cx2341x snd_pcm serio_raw videobuf_core vfat 
> dvb_core fat v4l2_common snd_timer videodev snd lpc_ich i2c_i801 joydev 
> mfd_core mei_me media soundcore tpm_infineon soc_button_array tpm_tis 
> mei shpchp tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc binfmt_misc 
> i915 nouveau mxm_wmi wmi e1000e ttm i2c_algo_bit drm_kms_helper
> [    6.229444]  drm ptp pps_core video
> [    6.229446] CPU: 1 PID: 593 Comm: v4l_id Not tainted 
> 3.19.3-200.fc21.x86_64 #1
> [    6.229447] Hardware name: Gigabyte Technology Co., Ltd. 
> Z87-D3HP/Z87-D3HP-CF, BIOS F6 01/20/2014
> [    6.229448]  0000000000000000 00000000d12b1131 ffff88042dacfc28 
> ffffffff8176e215
> [    6.229449]  0000000000000000 0000000000000000 ffff88042dacfc68 
> ffffffff8109bc1a
> [    6.229451]  ffffffffa0594000 ffff88042dacfd90 0000000000000000 
> ffffffffa04e2140
> [    6.229452] Call Trace:
> [    6.229466]  [<ffffffff8176e215>] dump_stack+0x45/0x57
> [    6.229469]  [<ffffffff8109bc1a>] warn_slowpath_common+0x8a/0xc0
> [    6.229472]  [<ffffffff8109bd4a>] warn_slowpath_null+0x1a/0x20
> [    6.229474]  [<ffffffffa04ca401>] v4l_querycap+0x41/0x70 [videodev]
> [    6.229477]  [<ffffffffa04ca6cc>] __video_do_ioctl+0x29c/0x320 [videodev]
> [    6.229479]  [<ffffffff81227131>] ? do_last+0x2f1/0x1210
> [    6.229491]  [<ffffffffa04cc776>] video_usercopy+0x366/0x5d0 [videodev]
> [    6.229494]  [<ffffffffa04ca430>] ? v4l_querycap+0x70/0x70 [videodev]
> [    6.229497]  [<ffffffffa04cc9f5>] video_ioctl2+0x15/0x20 [videodev]
> [    6.229499]  [<ffffffffa04c6794>] v4l2_ioctl+0x164/0x180 [videodev]
> [    6.229501]  [<ffffffff8122e298>] do_vfs_ioctl+0x2f8/0x500
> [    6.229502]  [<ffffffff8122e521>] SyS_ioctl+0x81/0xa0
> [    6.229505]  [<ffffffff81774a09>] system_call_fastpath+0x12/0x17
> [    6.229506] ---[ end trace dacd80d4b19277ea ]---
> 
> This is the warning about querycap not filling device_caps properly.
> The tree has dfdf780b4651cf4932b96d3fe296230afacc360a
> ('[media] cx18: add device_caps support') present already but
> I noticed several of the streams types are missing capabilities
> in cx18-streams.c (CX18_ENC_STREAM_TYPE_TS, CX18_ENC_STREAM_TYPE_PCM,
> CX18_ENC_STREAM_TYPE_IDX)
> 
> Do these need to have proper capabilities added as well to silence
> this warning?
> 
> Thanks,
> Laura
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