Re: [PATCH v2] Bluetooth: btusb: fixed command length alignment on Intel 8260

[Tedd Ho-Jeong An <tedd.an@intel.com>]

Hi Marcel,

On Mon, 18 May 2015 15:52:07 -0700
Tedd Ho-Jeong An <tedd.an@intel.com> wrote:

> From: Tedd Ho-Jeong An <tedd.an@intel.com>
> 
> This patch fixes the command length alignment issue for Intel Bluetooth
> 8260.
> 
> The length of parameters in the firmware downloading command must be
> multiplication of 4. If not, the command must append Intel_NOP command
> with extra parameters, zeros, at the end, and the firmware file is
> already included Intel_NOP command for alignment.
> 
> This patch checks the next command and if the next command is Intel_NOP
> command, it reads the Intel_NOP command and send them together.
> 
> For example, if the data from the firmware file looks like this:
> 8E FC 03 11 22 33 02 FC 03 00 00 00
> 
> Previously, btusb sends two commands:
> 09 FC 06 8E FC 03 11 22 33
> 09 FC 06 02 FC 03 00 00 00
> 
> This won't work because the length of parameters are 6 which violates
> the 4 byte alignment.
> 
> This patch will append them together and send as one command:
> 09 FC 0B 8E FC 03 11 22 33 02 FC 03 00 00 00
> 
> Signed-off-by: Tedd Ho-Jeong An <tedd.an@intel.com>
> ---
>  drivers/bluetooth/btusb.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index d21f3b4..13b9969 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -2541,6 +2541,22 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
>  
>  		cmd_len = sizeof(*cmd) + cmd->plen;
>  
> +		/* The parameter length of secure send command should be a
> +		 * multiplication of 4. If it is not, it needs to append
> +		 * Intel_NOP command with arbitrary number of parameters (zeros)
> +		 * to meet the 4 byte alignment.
> +		 * The FW file has already formatted with this. So if the next
> +		 * command is Intel_NOP then send them together.
> +		 */
> +		cmd = (void *)(fw_ptr + cmd_len);
> +		if (le16_to_cpu(cmd->opcode) == 0xfc02) {
> +			BT_DBG("%s: Updated cmd to include Intel_NOP",
> +			       hdev->name);
> +			/* Update cmd_len to include the Intel_NOP command
> +			 */
> +			cmd_len += sizeof(*cmd) + cmd->plen;
> +		}
> +
>  		/* Send each command from the firmware data buffer as
>  		 * a single Data fragment.
>  		 */

I just wonder if you had a chance to review this patch.

Regards,
Tedd