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Subject: Re: [alsa-devel] Applied "ASoC: core: ensure component names are
 unique" to the asoc tree
To:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Mark Brown <broonie@kernel.org>,
        Jerome Brunet <jbrunet@baylibre.com>, Vinod <vkoul@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>
CC:     <alsa-devel@alsa-project.org>, Liam Girdwood <lgirdwood@gmail.com>,
        linux-rpi-kernel <linux-rpi-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        "dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>
References: <applied-20200214134704.342501-1-jbrunet@baylibre.com>
 <CGME20200217121336eucas1p2deb35417f5c4646a89762fd6146c3cf9@eucas1p2.samsung.com>
 <f666e600-2b44-f1fa-7ccf-aa44da6b8979@samsung.com>
From:   Peter Ujfalusi <peter.ujfalusi@ti.com>
Message-ID: <427d2360-d67c-48cf-327e-c764182a2758@ti.com>
Date:   Mon, 17 Feb 2020 15:22:21 +0200
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Hi,

On 17/02/2020 14.13, Marek Szyprowski wrote:
> Dear All,

Adding Vinod and Geert + dmaengine list

> 
> On 14.02.2020 21:56, Mark Brown wrote:
>> The patch
>>
>>     ASoC: core: ensure component names are unique
>>
>> has been applied to the asoc tree at
>>
>>     https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
>>
>> All being well this means that it will be integrated into the linux-next
>> tree (usually sometime in the next 24 hours) and sent to Linus during
>> the next merge window (or sooner if it is a bug fix), however if
>> problems are discovered then the patch may be dropped or reverted.
>>
>> You may get further e-mails resulting from automated or manual testing
>> and review of the tree, please engage with people reporting problems and
>> send followup patches addressing any issues that are reported if needed.
>>
>> If any updates are required or you are submitting further changes they
>> should be sent as incremental updates against current git, existing
>> patches will not be replaced.
>>
>> Please add any relevant lists and maintainers to the CCs when replying
>> to this mail.
>>
>> Thanks,
>> Mark
>>
>>  From b2354e4009a773c00054b964d937e1b81cb92078 Mon Sep 17 00:00:00 2001
>> From: Jerome Brunet <jbrunet@baylibre.com>
>> Date: Fri, 14 Feb 2020 14:47:04 +0100
>> Subject: [PATCH] ASoC: core: ensure component names are unique
>>
>> Make sure each ASoC component is registered with a unique name.
>> The component is derived from the device name. If a device registers more
>> than one component, the component names will be the same.
>>
>> This usually brings up a warning about the debugfs directory creation of
>> the component since directory already exists.
>>
>> In such case, start numbering the component of the device so the names
>> don't collide anymore.
>>
>> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
>> Link: https://lore.kernel.org/r/20200214134704.342501-1-jbrunet@baylibre.com
>> Signed-off-by: Mark Brown <broonie@kernel.org>
> 
> This patch landed in today's linux-next and I've noticed that it breaks 
> registration of VC4 DRM driver on Raspberry Pi3 boards (I've compiled 
> kernel from bcm2835_defconfig):
> 
> sysfs: cannot create duplicate filename 
> '/devices/platform/soc/3f902000.hdmi/dma:audio-rx'

It looks like that DMAengine tries to create the same link multiple times?

I'm not sure why reverting this patch fixes the issue...

- Péter

> CPU: 0 PID: 67 Comm: kworker/0:2 Tainted: G        W 
> 5.6.0-rc2-next-20200217 #314
> Hardware name: BCM2835
> Workqueue: events deferred_probe_work_func
> Backtrace:
> [<c010c424>] (dump_backtrace) from [<c010c8a8>] (show_stack+0x20/0x24)
>   r7:eb73d5c0 r6:eb53a8f0 r5:eb73d5c0 r4:eb4d3000
> [<c010c888>] (show_stack) from [<c080ad40>] (dump_stack+0x20/0x28)
> [<c080ad20>] (dump_stack) from [<c02be6e0>] (sysfs_warn_dup+0x60/0x74)
> [<c02be680>] (sysfs_warn_dup) from [<c02bea00>] 
> (sysfs_do_create_link_sd+0xa4/0xc0)
>   r7:eb73d5c0 r6:eb53a8f0 r5:eb6becb8 r4:ffffffef
> [<c02be95c>] (sysfs_do_create_link_sd) from [<c02beb68>] 
> (sysfs_create_link+0x34/0x44)
>   r9:eb698c40 r8:c093e47c r7:00000000 r6:eb537e10 r5:eb6f9900 r4:eb537e10
> [<c02beb34>] (sysfs_create_link) from [<c0415afc>] 
> (dma_request_chan+0x1b8/0x208)
> [<c0415944>] (dma_request_chan) from [<c05f25a0>] 
> (snd_dmaengine_pcm_register+0xf4/0x1bc)
>   r10:c0963460 r9:eb537e10 r8:c093e47c r7:00000000 r6:eb537e10 r5:eb6f9900
>   r4:c093e468
> [<c05f24ac>] (snd_dmaengine_pcm_register) from [<c05f0ebc>] 
> (devm_snd_dmaengine_pcm_register+0x4c/0x84)
>   r10:eb715c4c r9:c093e3d4 r8:eb537e00 r7:00000000 r6:eb537e10 r5:eb7ca240
>   r4:c093e468
> [<c05f0e70>] (devm_snd_dmaengine_pcm_register) from [<c0492dc0>] 
> (vc4_hdmi_bind+0x3a8/0x590)
>   r7:eb537e10 r6:eb537e10 r5:eb715440 r4:eb715c40
> [<c0492a18>] (vc4_hdmi_bind) from [<c049b6e0>] 
> (component_bind_all+0x128/0x238)
>   r10:eb7267c0 r9:00000008 r8:eb73f800 r7:00000018 r6:00000000 r5:eb7016c0
>   r4:eb6c9240
> [<c049b5b8>] (component_bind_all) from [<c048c150>] 
> (vc4_drm_bind+0xe4/0x17c)
>   r9:00000008 r8:eb6c88c0 r7:eb6a2840 r6:eb53b210 r5:00000000 r4:eb73f800
> [<c048c06c>] (vc4_drm_bind) from [<c049adc8>] 
> (try_to_bring_up_master+0x190/0x264)
>   r7:eb6a2840 r6:000000a8 r5:eb7267c0 r4:eb6c9240
> [<c049ac38>] (try_to_bring_up_master) from [<c049b13c>] 
> (__component_add+0x80/0x114)
>   r10:c0d57488 r9:00000012 r8:00000000 r7:eb6c9240 r6:c093e924 r5:c0d572f8
>   r4:eb7267c0
> [<c049b0bc>] (__component_add) from [<c049b1ec>] (component_add+0x1c/0x20)
>   r7:c0d56f7c r6:c0d56f7c r5:eb534a10 r4:00000000
> [<c049b1d0>] (component_add) from [<c0493864>] (vc4_vec_dev_probe+0x20/0x28)
> [<c0493844>] (vc4_vec_dev_probe) from [<c04a43a4>] 
> (platform_drv_probe+0x58/0xa8)
> [<c04a434c>] (platform_drv_probe) from [<c04a2298>] 
> (really_probe+0x1a8/0x428)
>   r7:c0d56f7c r6:00000000 r5:c0e579b8 r4:eb534a10
> [<c04a20f0>] (really_probe) from [<c04a2840>] 
> (driver_probe_device+0x158/0x1ac)
>   r9:00000000 r8:00000001 r7:eb70fe9c r6:c0d56f7c r5:c0d56f7c r4:eb534a10
> [<c04a26e8>] (driver_probe_device) from [<c04a2a40>] 
> (__device_attach_driver+0xb0/0xf8)
>   r9:00000000 r8:00000001 r7:eb70fe9c r6:c0d56f7c r5:eb534a10 r4:00000001
> [<c04a2990>] (__device_attach_driver) from [<c04a0408>] 
> (bus_for_each_drv+0xa0/0xc8)
>   r7:c04a2990 r6:eb70fe9c r5:c0d04248 r4:00000000
> [<c04a0368>] (bus_for_each_drv) from [<c04a25bc>] 
> (__device_attach+0xa4/0x158)
>   r7:eb534a54 r6:c0d04248 r5:c0d576a8 r4:eb534a10
> [<c04a2518>] (__device_attach) from [<c04a2aa4>] 
> (device_initial_probe+0x1c/0x20)
>   r8:eb9c7300 r7:00000000 r6:eb534a10 r5:c0d576a8 r4:eb534a10
> [<c04a2a88>] (device_initial_probe) from [<c04a12d4>] 
> (bus_probe_device+0x38/0x90)
> [<c04a129c>] (bus_probe_device) from [<c04a1848>] 
> (deferred_probe_work_func+0x70/0xb0)
>   r7:00000000 r6:c0d57478 r5:c0d5746c r4:eb534a10
> [<c04a17d8>] (deferred_probe_work_func) from [<c0135a50>] 
> (process_one_work+0x1a8/0x2ac)
>   r7:00000000 r6:c0d0c8a4 r5:c0d57484 r4:eb6ed880
> [<c01358a8>] (process_one_work) from [<c0136ddc>] 
> (worker_thread+0x1f0/0x2e8)
>   r10:00000000 r9:c0d156e0 r8:c0d0c8b8 r7:c0d156e0 r6:c0d0c8a4 r5:eb6ed894
>   r4:eb6ed880
> [<c0136bec>] (worker_thread) from [<c013b5a0>] (kthread+0x120/0x130)
>   r10:00000000 r9:eb6f5018 r8:eb4e9e98 r7:c0136bec r6:eb6ed880 r5:eb6e6b40
>   r4:eb6f5000 r3:00000000
> [<c013b480>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
> Exception stack(0xeb70ffb0 to 0xeb70fff8)
> ffa0:                                     00000000 00000000 00000000 
> 00000000
> ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
> 00000000
> ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
>   r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:c013b480 r4:eb6e6b40
> vc4_hdmi 3f902000.hdmi: Cannot create DMA dma:audio-rx symlink
> vc4_hdmi 3f902000.hdmi: ASoC: CODEC DAI vc4-hdmi-hifi not registered
> vc4_hdmi 3f902000.hdmi: Could not register sound card: -517
> vc4-drm soc:gpu: failed to bind 3f902000.hdmi (ops vc4_hdmi_ops): -517
> vc4-drm soc:gpu: master bind failed: -517
> 
> Reverting this patch fixes vc4-drm driver registration and 
> initialization. If I find some spare time I will debug this issue 
> further, but it looks that it is somehow related to deferred probe.
> 
> 
>> ---
>>   sound/soc/soc-core.c | 29 ++++++++++++++++++++++++++++-
>>   1 file changed, 28 insertions(+), 1 deletion(-)
>>
>> diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
>> index 03b87427faa7..6a58a8f6e3c4 100644
>> --- a/sound/soc/soc-core.c
>> +++ b/sound/soc/soc-core.c
>> @@ -2446,6 +2446,33 @@ static int snd_soc_register_dais(struct snd_soc_component *component,
>>   	return ret;
>>   }
>>   
>> +static char *snd_soc_component_unique_name(struct device *dev,
>> +					   struct snd_soc_component *component)
>> +{
>> +	struct snd_soc_component *pos;
>> +	int count = 0;
>> +	char *name, *unique;
>> +
>> +	name = fmt_single_name(dev, &component->id);
>> +	if (!name)
>> +		return name;
>> +
>> +	/* Count the number of components registred by the device */
>> +	for_each_component(pos) {
>> +		if (dev == pos->dev)
>> +			count++;
>> +	}
>> +
>> +	/* Keep naming as it is for the 1st component */
>> +	if (!count)
>> +		return name;
>> +
>> +	unique = devm_kasprintf(dev, GFP_KERNEL, "%s-%d", name, count);
>> +	devm_kfree(dev, name);
>> +
>> +	return unique;
>> +}
>> +
>>   static int snd_soc_component_initialize(struct snd_soc_component *component,
>>   	const struct snd_soc_component_driver *driver, struct device *dev)
>>   {
>> @@ -2454,7 +2481,7 @@ static int snd_soc_component_initialize(struct snd_soc_component *component,
>>   	INIT_LIST_HEAD(&component->card_list);
>>   	mutex_init(&component->io_mutex);
>>   
>> -	component->name = fmt_single_name(dev, &component->id);
>> +	component->name = snd_soc_component_unique_name(dev, component);
>>   	if (!component->name) {
>>   		dev_err(dev, "ASoC: Failed to allocate name\n");
>>   		return -ENOMEM;
> 
> Best regards
> 

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