Re: [PATCH v2] Bluetooth: btusb: using big-endian definition for board_id in struct qca_version

[tjiang]

Hi Marcel:
  yeah , you are right, but in fact we mixing little-endian and 
big-endian is defined by qc btsoc(have some reason), so host only should 
be align with it , I will make another change , need your help to 
review, thank you.

regards.
tim


On 2021-11-03 22:24, Marcel Holtmann wrote:
> Hi Tim,
>
> > As we name nvm file by using big-endian for boardID, so align host 
> > with it.
> >
> > Signed-off-by: Tim Jiang <tjiang@xxxxxxxxxxxxxx>
> > ---
> > drivers/bluetooth/btusb.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> > index 46d892bbde62..08a1c6d8390f 100644
> > --- a/drivers/bluetooth/btusb.c
> > +++ b/drivers/bluetooth/btusb.c
> > @@ -2883,7 +2883,7 @@ struct qca_version {
> > 	__le32	rom_version;
> > 	__le32	patch_version;
> > 	__le32	ram_version;
> > -	__le16	board_id;
> > +	__be16	board_id;
> > 	__le16	flag;
> > 	__u8	reserved[4];
> > } __packed;
> > @@ -3072,7 +3072,7 @@ static void btusb_generate_qca_nvm_name(char 
> > *fwname, size_t max_size,
> > 	u16 flag = le16_to_cpu(ver->flag);
> >
> > 	if (((flag >> 8) & 0xff) == QCA_FLAG_MULTI_NVM) {
> > -		u16 board_id = le16_to_cpu(ver->board_id);
> > +		u16 board_id = be16_to_cpu(ver->board_id);
> > 		const char *variant;
>
> my original comment still stands. Are you sure you are doing this
> correctly. The in-memory layout of your NVM is mixed little-endian and
> big-endian? Really? Or do you want to convert back from host endian to
> big endian?
>
> You commit message text suggest that you have to do this:
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 46d892bbde62..55a33a5fea56 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3090,7 +3090,7 @@ static void btusb_generate_qca_nvm_name(char
> *fwname, size_t max_size,
>                                 rom_version, variant);
>                 } else {
>                         snprintf(fwname, max_size,
> "qca/nvm_usb_%08x%s_%04x.bin",
> -                               rom_version, variant, board_id);
> +                               rom_version, variant, 
> cpu_to_be16(board_id));
>                 }
>         } else {
>                 snprintf(fwname, max_size, "qca/nvm_usb_%08x.bin”,
>
> And really, I can not do this anymore. Write lengthy commit messages
> explaining your change in detail. I am not looking a patches anymore
> until they have a proper paragraph explaining the change and why it is
> correct.
>
> Also this change had v16 before I merged and even in that version I
> had to fix issues. Please stop wasting my time. I have no idea why
> this wasn’t caught earlier. It is a fundamental flaw. I am close to
> just reverting the previous patch since it seems it clearly needs more
> testing.
>
> Regards
>
> Marcel