linux-kernel - Re: [PATCH] Revert "firewire: Annotate struct fw_iso_packet with __counted

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Message-ID: <20240727013657.GB163039@workstation.local>
Date: Sat, 27 Jul 2024 10:36:57 +0900
From: Takashi Sakamoto <o-takashi@...amocchi.jp>
To: linux1394-devel@...ts.sourceforge.net
Cc: linux-kernel@...r.kernel.org, gustavo@...eddedor.com
Subject: Re: [PATCH] Revert "firewire: Annotate struct fw_iso_packet with
 __counted_by()"

On Fri, Jul 26, 2024 at 01:16:48AM +0900, Takashi Sakamoto wrote:
> This reverts commit d3155742db89df3b3c96da383c400e6ff4d23c25.
> 
> The header_length field is byte unit, thus it can not express the number of
> elements in header field.
> 
> Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
> ---
>  include/linux/firewire.h | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/firewire.h b/include/linux/firewire.h
> index 00abe0e5d602..1cca14cf5652 100644
> --- a/include/linux/firewire.h
> +++ b/include/linux/firewire.h
> @@ -462,9 +462,8 @@ struct fw_iso_packet {
>  				/* rx: Sync bit, wait for matching sy	*/
>  	u32 tag:2;		/* tx: Tag in packet header		*/
>  	u32 sy:4;		/* tx: Sy in packet header		*/
> -	u32 header_length:8;	/* Length of immediate header		*/
> -				/* tx: Top of 1394 isoch. data_block    */
> -	u32 header[] __counted_by(header_length);
> +	u32 header_length:8;	/* Size of immediate header		*/
> +	u32 header[];		/* tx: Top of 1394 isoch. data_block	*/
>  };
>  
>  #define FW_ISO_CONTEXT_TRANSMIT			0

Applied to for-linus branch in firewire subsystem tree[1], with slight
change of comment. It would be sent to mainline today with another patch[2].


[1] https://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394.git/log/?h=for-linus
[2] https://lore.kernel.org/stable/20240725155640.128442-1-o-takashi@sakamocchi.jp/

Regards

Takashi Sakamoto