linux-kernel - Re: [PATCH v12 02/41] xhci: add helper to stop endpoint and wait for completion

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Date: Thu,  4 Jan 2024 18:54:42 +0800
From: Hillf Danton <hdanton@...a.com>
To: Wesley Cheng <quic_wcheng@...cinc.com>
Cc: Greg KH <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	linux-sound@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: Re: [PATCH v12 02/41] xhci: add helper to stop endpoint and wait for completion

On Tue, 2 Jan 2024 13:45:10 -0800
> From: Mathias Nyman <mathias.nyman@...ux.intel.com>
> +/*
> + * Synchronous XHCI stop endpoint helper.  Issues the stop endpoint command and
> + * waits for the command completion before returning.
> + */
> +int xhci_stop_endpoint_sync(struct xhci_hcd *xhci, struct xhci_virt_ep *ep, int suspend,
> +			    gfp_t gfp_flags)
> +{
> +	struct xhci_command *command;
> +	unsigned long flags;
> +	int ret;
> +
> +	command = xhci_alloc_command(xhci, true, GFP_KERNEL);

Given unused gfp_flags, s/GFP_KERNEL/gfp_flags/ ?

> +	if (!command)
> +		return -ENOMEM;
> +
> +	spin_lock_irqsave(&xhci->lock, flags);
> +	ret = xhci_queue_stop_endpoint(xhci, command, ep->vdev->slot_id,
> +				       ep->ep_index, suspend);
> +	if (ret < 0) {
> +		spin_unlock_irqrestore(&xhci->lock, flags);
> +		goto out;
> +	}
> +
> +	xhci_ring_cmd_db(xhci);
> +	spin_unlock_irqrestore(&xhci->lock, flags);
> +
> +	ret = wait_for_completion_timeout(command->completion, msecs_to_jiffies(3000));
> +	if (!ret)
> +		xhci_warn(xhci, "%s: Unable to stop endpoint.\n",
> +				__func__);
> +
> +	if (command->status == COMP_COMMAND_ABORTED ||
> +	    command->status == COMP_COMMAND_RING_STOPPED) {
> +		xhci_warn(xhci, "Timeout while waiting for stop endpoint command\n");
> +		ret = -ETIME;
> +	}
> +out:
> +	xhci_free_command(xhci, command);
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(xhci_stop_endpoint_sync);