Re: [PATCH] Bluetooth: btwilink driver

[Ville Tervo <ville.tervo@nokia.com>]

Hi Pavan,

On Mon, Feb 07, 2011 at 04:38:52AM -0600, ext pavan_savoy@ti.com wrote:
> From: Pavan Savoy <pavan_savoy@ti.com>
> 
> Gustavo,
> 
> As suggested, the modifications to TI ST driver to remove the bluetooth
> references have been made and the changes have been merged to the
> linux-next tree.
> 
> Find below the patch for the btwilink driver,
> I have taken care of your following comments,
> 1. channel IDs and the offsets are now being taken from the
> header file hci.h.
> 2. removed the un-necessary BT_ERR.
> 3. changed the order during return from st_register.
> 4. continue to unregister even if 1st unregister fails.
> 
> Please review and provide comments,

Will do. Some comment

> +/* Called from HCI core to initialize the device */
> +static int ti_st_open(struct hci_dev *hdev)
> +{
> +	unsigned long timeleft;
> +	struct ti_st *hst;
> +	int err, i;
> +
> +	BT_DBG("%s %p", hdev->name, hdev);
> +
> +	if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
> +		return -EBUSY;
> +
> +	/* provide contexts for callbacks from ST */
> +	hst = hdev->driver_data;
> +
> +	for (i = 0; i < MAX_BT_CHNL_IDS; i++) {
> +		ti_st_proto[i].priv_data = hst;
> +		ti_st_proto[i].max_frame_size = HCI_MAX_FRAME_SIZE;
> +
> +		err = st_register(&ti_st_proto[i]);
> +		if (!err)
> +			goto done_downloading_firmware;
> +
> +		if (err != -EINPROGRESS) {
> +			clear_bit(HCI_RUNNING, &hdev->flags);
> +			BT_ERR("st_register failed %d", err);
> +			return err;
> +		} else {

No need for else. Less indentation looks better to me at least.

> +			/* ST is busy with either protocol
> +			 * registration or firmware download.
> +			 */
> +			/* Prepare wait-for-completion handler data structures.
> +			*/
> +			init_completion(&hst->wait_reg_completion);

init_completion should be done before startin action which executes complete().
IOW this should be before st_register if I understood this correctly.

Otherwise the started action might call complete before init_completion and
wait_for_completion_timeout will just time even everything went fine.

-- 
Ville