Re: [PATCH] cxl/memdev: Fix firmware upload exact-fit handling

On 7/13/26 4:27 AM, guzebing wrote:
> From: Guzebing <[email protected]>
> 
> cxl_fw_prepare() classifies a firmware image as a one-shot transfer
> only when its Transfer FW input payload is smaller than the mailbox
> payload size. An image that exactly fills the payload is therefore
> treated as a multi-part transfer.
> 
> The firmware loader invokes cxl_fw_write() only once for that image.
> Since both offset == 0 and remaining == 0, the multi-part action
> selection sends INITIATE, never sends END, and then attempts to activate
> the target slot.
> 
> Include equality in the one-shot classification so exact-fit images use
> the FULL action.
> 
> Fixes: 9521875bbe00 ("cxl: add a firmware update mechanism using the sysfs firmware loader")
> Signed-off-by: Guzebing <[email protected]>

Applied to cxl/next
af5035e1b3e4

> ---
>  drivers/cxl/core/memdev.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
> index 33a3d2e7b13af..45e7d2be17e09 100644
> --- a/drivers/cxl/core/memdev.c
> +++ b/drivers/cxl/core/memdev.c
> @@ -921,7 +921,7 @@ static enum fw_upload_err cxl_fw_prepare(struct fw_upload *fwl, const u8 *data,
>  	if (!size)
>  		return FW_UPLOAD_ERR_INVALID_SIZE;
>  
> -	mds->fw.oneshot = struct_size(transfer, data, size) <
> +	mds->fw.oneshot = struct_size(transfer, data, size) <=
>  			    cxl_mbox->payload_size;
>  
>  	if (cxl_mem_get_fw_info(mds))