Date:   Sun, 12 Mar 2017 12:21:45 -0700
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     Russell King - ARM Linux <linux@...linux.org.uk>
Cc:     robh+dt@...nel.org, mark.rutland@....com, shawnguo@...nel.org,
        kernel@...gutronix.de, fabio.estevam@....com, mchehab@...nel.org,
        hverkuil@...all.nl, nick@...anahar.org, markus.heiser@...marIT.de,
        p.zabel@...gutronix.de, laurent.pinchart+renesas@...asonboard.com,
        bparrot@...com, geert@...ux-m68k.org, arnd@...db.de,
        sudipm.mukherjee@...il.com, minghsiu.tsai@...iatek.com,
        tiffany.lin@...iatek.com, jean-christophe.trotin@...com,
        horms+renesas@...ge.net.au, niklas.soderlund+renesas@...natech.se,
        robert.jarzmik@...e.fr, songjun.wu@...rochip.com,
        andrew-ct.chen@...iatek.com, gregkh@...uxfoundation.org,
        shuah@...nel.org, sakari.ailus@...ux.intel.com, pavel@....cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org,
        Steve Longerbeam <steve_longerbeam@...tor.com>
Subject: Re: [PATCH v5 00/39] i.MX Media Driver



On 03/12/2017 10:51 AM, Russell King - ARM Linux wrote:
> I've just looked at my test system's dmesg, and spotted this in the log.
> It's been a while since these popped out of the kernel, so I don't know
> what caused them (other than the obvious, a media-ctl command.)
>
> My script which sets this up only enables links, and then configures the
> formats etc, and doesn't disable them, so I don't see why the power
> count should be going negative.

There's actually nothing preventing userland from disabling a link
multiple times, and imx_media_link_notify() complies, and so
csi_s_power(OFF) gets called multiple times, and so that WARN_ON()
in there is silly, I borrowed this from other MC driver examples,
but it makes no sense to me, I'll remove it and prevent the power
count from going negative.

Steve



>
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 1889 at drivers/staging/media/imx/imx-media-csi.c:806 csi_s_power+0x9c/0xa8 [imx_media_csi]
> Modules linked in: caam_jr uvcvideo snd_soc_imx_sgtl5000 snd_soc_fsl_asoc_card snd_soc_imx_spdif imx_media_csi(C) imx6_mipi_csi2(C) snd_soc_imx_audmux snd_soc_sgtl5000 imx219 imx_media_ic(C) imx_media_capture(C) imx_media_vdic(C) caam video_multiplexer imx_sdma coda v4l2_mem2mem videobuf2_v4l2 imx2_wdt imx_vdoa videobuf2_dma_contig videobuf2_core videobuf2_vmalloc videobuf2_memops snd_soc_fsl_ssi
> imx_thermal snd_soc_fsl_spdif imx_pcm_dma imx_media(C) imx_media_common(C) nfsd
> rc_pinnacle_pctv_hd dw_hdmi_ahb_audio dw_hdmi_cec etnaviv
> CPU: 1 PID: 1889 Comm: media-ctl Tainted: G         C      4.11.0-rc1+ #2125
> Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
> Backtrace:
> [<c0013ba4>] (dump_backtrace) from [<c0013de4>] (show_stack+0x18/0x1c)
>  r6:600e0013 r5:ffffffff r4:00000000 r3:00000000
> [<c0013dcc>] (show_stack) from [<c033f728>] (dump_stack+0xa4/0xdc)
> [<c033f684>] (dump_stack) from [<c00326cc>] (__warn+0xdc/0x108)
>  r6:bf124014 r5:00000000 r4:00000000 r3:c09ea4a8
> [<c00325f0>] (__warn) from [<c0032720>] (warn_slowpath_null+0x28/0x30)
>  r10:ede00010 r8:ede4a348 r7:d039501c r6:d0395140 r5:00000000 r4:d0395010
> [<c00326f8>] (warn_slowpath_null) from [<bf1229e0>] (csi_s_power+0x9c/0xa8 [imx_media_csi])
> [<bf122944>] (csi_s_power [imx_media_csi]) from [<bf04a930>] (imx_media_set_power+0x3c/0x108 [imx_media_common])
>  r7:d039501c r6:00000000 r5:00000000 r4:0000000c
> [<bf04a8f4>] (imx_media_set_power [imx_media_common]) from [<bf04aa34>] (imx_media_pipeline_set_power+0x38/0x40 [imx_media_common])
>  r10:00000001 r9:00000001 r8:ede4a348 r7:ede00010 r6:ede4a348 r5:d039501c
>  r4:00000001
> [<bf04a9fc>] (imx_media_pipeline_set_power [imx_media_common]) from [<bf052148>] (imx_media_link_notify+0xf0/0x144 [imx_media])
>  r7:ede00010 r6:ed59f900 r5:00000000 r4:d039501c
> [<bf052058>] (imx_media_link_notify [imx_media]) from [<c04fa858>] (__media_entity_setup_link+0x110/0x1d8)
>  r10:c0347c03 r9:d7eb3dc8 r8:befe92b0 r7:ede00010 r6:00000000 r5:00000001
>  r4:ed59f900 r3:bf052058
> [<c04fa748>] (__media_entity_setup_link) from [<c04f9bb0>] (media_device_setup_link+0x84/0x90)
>  r7:ede00010 r6:ede00010 r5:ef3fd810 r4:d7eb3dc8
> [<c04f9b2c>] (media_device_setup_link) from [<c04f9e94>] (media_device_ioctl+0xa4/0x148)
>  r6:00000000 r5:d7eb3dc8 r4:c077b014 r3:c04f9b2c
> [<c04f9df0>] (media_device_ioctl) from [<c04fa3a0>] (media_ioctl+0x38/0x4c)
>  r10:ed5eca68 r9:d7eb2000 r8:befe92b0 r7:00000003 r6:00000003 r5:e82ca280
>  r4:c0190304
> [<c04fa368>] (media_ioctl) from [<c018f9c0>] (do_vfs_ioctl+0x98/0x9a0)
> [<c018f928>] (do_vfs_ioctl) from [<c0190304>] (SyS_ioctl+0x3c/0x60)
>  r10:00000000 r9:d7eb2000 r8:befe92b0 r7:00000003 r6:c0347c03 r5:e82ca280
>  r4:e82ca280
> [<c01902c8>] (SyS_ioctl) from [<c000fd60>] (ret_fast_syscall+0x0/0x1c)
>  r8:c000ff04 r7:00000036 r6:000261d0 r5:00000001 r4:009162e8 r3:00000001
> ---[ end trace 4fdd40e5adfc4485 ]---
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 1889 at drivers/staging/media/imx/imx-media-csi.c:806 csi_s_power+0x9c/0xa8 [imx_media_csi]
> Modules linked in: caam_jr uvcvideo snd_soc_imx_sgtl5000 snd_soc_fsl_asoc_card snd_soc_imx_spdif imx_media_csi(C) imx6_mipi_csi2(C) snd_soc_imx_audmux snd_soc_sgtl5000 imx219 imx_media_ic(C) imx_media_capture(C) imx_media_vdic(C) caam video_multiplexer imx_sdma coda v4l2_mem2mem videobuf2_v4l2 imx2_wdt imx_vdoa videobuf2_dma_contig videobuf2_core videobuf2_vmalloc videobuf2_memops snd_soc_fsl_ssi
> imx_thermal snd_soc_fsl_spdif imx_pcm_dma imx_media(C) imx_media_common(C) nfsd
> rc_pinnacle_pctv_hd dw_hdmi_ahb_audio dw_hdmi_cec etnaviv
> CPU: 1 PID: 1889 Comm: media-ctl Tainted: G        WC      4.11.0-rc1+ #2125
> Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
> Backtrace:
> [<c0013ba4>] (dump_backtrace) from [<c0013de4>] (show_stack+0x18/0x1c)
>  r6:600e0013 r5:ffffffff r4:00000000 r3:00000000
> [<c0013dcc>] (show_stack) from [<c033f728>] (dump_stack+0xa4/0xdc)
> [<c033f684>] (dump_stack) from [<c00326cc>] (__warn+0xdc/0x108)
>  r6:bf124014 r5:00000000 r4:00000000 r3:c09ea4a8
> [<c00325f0>] (__warn) from [<c0032720>] (warn_slowpath_null+0x28/0x30)
>  r10:ede00010 r8:ede4a348 r7:ee000800 r6:d0395140 r5:00000000 r4:d0395010
> [<c00326f8>] (warn_slowpath_null) from [<bf1229e0>] (csi_s_power+0x9c/0xa8 [imx_media_csi])
> [<bf122944>] (csi_s_power [imx_media_csi]) from [<bf04a930>] (imx_media_set_power+0x3c/0x108 [imx_media_common])
>  r7:ee000800 r6:00000000 r5:00000000 r4:0000000c
> [<bf04a8f4>] (imx_media_set_power [imx_media_common]) from [<bf04aa34>] (imx_media_pipeline_set_power+0x38/0x40 [imx_media_common])
>  r10:00000001 r9:00000001 r8:ede4a348 r7:ede00010 r6:ede4a348 r5:ee000800
>  r4:00000001
> [<bf04a9fc>] (imx_media_pipeline_set_power [imx_media_common]) from [<bf052148>] (imx_media_link_notify+0xf0/0x144 [imx_media])
>  r7:ede00010 r6:d0320480 r5:ee000800 r4:ee000800
> [<bf052058>] (imx_media_link_notify [imx_media]) from [<c04fa858>] (__media_entity_setup_link+0x110/0x1d8)
>  r10:c0347c03 r9:d7eb3dc8 r8:befe92b0 r7:ede00010 r6:00000000 r5:00000001
>  r4:d0320480 r3:bf052058
> [<c04fa748>] (__media_entity_setup_link) from [<c04f9bb0>] (media_device_setup_link+0x84/0x90)
>  r7:ede00010 r6:ede00010 r5:d039501c r4:d7eb3dc8
> [<c04f9b2c>] (media_device_setup_link) from [<c04f9e94>] (media_device_ioctl+0xa4/0x148)
>  r6:00000000 r5:d7eb3dc8 r4:c077b014 r3:c04f9b2c
> [<c04f9df0>] (media_device_ioctl) from [<c04fa3a0>] (media_ioctl+0x38/0x4c)
>  r10:ed5eca68 r9:d7eb2000 r8:befe92b0 r7:00000003 r6:00000003 r5:e82ca500
>  r4:c0190304
> [<c04fa368>] (media_ioctl) from [<c018f9c0>] (do_vfs_ioctl+0x98/0x9a0)
> [<c018f928>] (do_vfs_ioctl) from [<c0190304>] (SyS_ioctl+0x3c/0x60)
>  r10:00000000 r9:d7eb2000 r8:befe92b0 r7:00000003 r6:c0347c03 r5:e82ca500
>  r4:e82ca500
> [<c01902c8>] (SyS_ioctl) from [<c000fd60>] (ret_fast_syscall+0x0/0x1c)
>  r8:c000ff04 r7:00000036 r6:000261d0 r5:00000001 r4:0091737c r3:00000001
> ---[ end trace 4fdd40e5adfc4486 ]---
>

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