linux-kernel - Re: [alsa-devel] [PATCH 1/6] soundwire: fix startup sequence for Intel/Cadence

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Date:   Mon, 16 Sep 2019 13:14:12 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [PATCH 1/6] soundwire: fix startup sequence for
 Intel/Cadence


>>> @@ -1043,8 +1043,6 @@ static int intel_probe(struct platform_device 
>>> *pdev)
>>>       if (ret)
>>>           goto err_init;
>>> -    ret = sdw_cdns_enable_interrupt(&sdw->cdns);
>>> -
>>>       /* Read the PDI config and initialize cadence PDI */
>>>       intel_pdi_init(sdw, &config);
>>>       ret = sdw_cdns_pdi_init(&sdw->cdns, config);
>>> @@ -1062,6 +1060,18 @@ static int intel_probe(struct platform_device 
>>> *pdev)
>>>           goto err_init;
>>>       }
>>> +    ret = sdw_cdns_enable_interrupt(&sdw->cdns);
>>> +    if (ret < 0) {
>>> +        dev_err(sdw->cdns.dev, "cannot enable interrupts\n");
>>> +        goto err_init;
>>> +    }
>>> +
>>> +    ret = sdw_cdns_exit_reset(&sdw->cdns);
>>> +    if (ret < 0) {
>>> +        dev_err(sdw->cdns.dev, "unable to exit bus reset sequence\n");
>>> +        goto err_init;
>>
>> Don't you want to disable interrupts at least... before you return
>> error? err_init does bus cleanup and not controller one
> 
> yes good point, let me look at this.

The existing code has no interrupt disable sequence.

I will add this improved error handling in a follow-up patch, after the 
capability to disable interrupts is added.