From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Subject: Re: [PATCH 2/2] ASoC: Intel: sst-acpi: Request
 firmware before SST platform driver probing
Date: Wed, 19 Feb 2014 09:28:39 +0200
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To: Takashi Iwai <tiwai@suse.de>
Cc: Liam Girdwood <liam.r.girdwood@linux.intel.com>, alsa-devel@alsa-project.org, Mark Brown <broonie@kernel.org>, Liam Girdwood <lgirdwood@gmail.com>
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Hi

On 02/19/2014 09:15 AM, Takashi Iwai wrote:
> At Wed, 19 Feb 2014 08:57:53 +0200,
> Jarkko Nikula wrote:
>>
>> I felt it was needless to test NULL pointers here since release_firmware
>> checks it directly and platform_device_unregister indirectly. Not in
>> platform_device_unregister but when calling platform_device_del and
>> platform_device_put there.
> The problem is that it may contain ERR_PTR(xxx).  You have to either
> clear to NULL in
>
> 	if (IS_ERR(sst_acpi->pdev_pcm)) {
> 		dev_err(dev, "Cannot register device %s. Error %d\n",
> 			desc->drv_name, (int)PTR_ERR(sst_acpi->pdev_pcm));
> 		sst_acpi->pdev_pcm = NULL;
> 	}
>
> or check conditionally like
>
> 	if (!IS_ERR_OR_NULL(sst_acpi->pdev_pcm))
> 	 	platform_device_unregister(sst_acpi->pdev_pcm);
> 	
> Maybe the former is better.
>
Oh yes and I'm even testing it with the IS_ERR and PTR_ERR. Why that 
knowledge did not carry to sst_acpi_remove... will fix.

-- 
Jarkko