linux-kernel - Re: [PATCH v3 27/28] sound: usb: card: Allow for rediscovery of connected USB SND devices

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Message-ID: <9a05953e-fc43-3223-2c96-8e12eac93bf4@suse.com>
Date:   Thu, 9 Mar 2023 12:32:48 +0100
From:   Oliver Neukum <oneukum@...e.com>
To:     Wesley Cheng <quic_wcheng@...cinc.com>,
        srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, broonie@...nel.org, lgirdwood@...il.com,
        krzysztof.kozlowski+dt@...aro.org, agross@...nel.org,
        Thinh.Nguyen@...opsys.com, bgoswami@...cinc.com,
        andersson@...nel.org, robh+dt@...nel.org,
        gregkh@...uxfoundation.org, tiwai@...e.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, quic_jackp@...cinc.com,
        quic_plai@...cinc.com
Subject: Re: [PATCH v3 27/28] sound: usb: card: Allow for rediscovery of
 connected USB SND devices

On 09.03.23 00:57, Wesley Cheng wrote:
  
> +/*
> + * in case the platform driver was not ready at the time of USB SND
> + * device connect, expose an API to discover all connected USB devices
> + * so it can populate any dependent resources/structures.
> + */
> +void snd_usb_rediscover_devices(void)
> +{
> +	int i;
> +
> +	mutex_lock(&register_mutex);
> +	for (i = 0; i < SNDRV_CARDS; i++) {
> +		if (usb_chip[i])
> +			if (platform_ops && platform_ops->connect_cb)

Really check this every time?

	Regards
		Oliver