Re: [PATCH v4 1/7] fpga-mgr: wrap the write_init() op

[Moritz Fischer <mdf@kernel.org>]

On Fri, Jun 25, 2021 at 12:51:42PM -0700, trix@redhat.com wrote:
> From: Tom Rix <trix@redhat.com>
> 
> An FPGA manager should not be required to provide a
> write_init() op if there is nothing for it do.
> So add a wrapper and move the op checking.
> Default to success.
> 
> Signed-off-by: Tom Rix <trix@redhat.com>
> ---
>  drivers/fpga/fpga-mgr.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/fpga/fpga-mgr.c b/drivers/fpga/fpga-mgr.c
> index ecb4c3c795fa5..c047de8a059b7 100644
> --- a/drivers/fpga/fpga-mgr.c
> +++ b/drivers/fpga/fpga-mgr.c
> @@ -25,6 +25,15 @@ struct fpga_mgr_devres {
>  	struct fpga_manager *mgr;
>  };
>  
> +static inline int fpga_mgr_write_init(struct fpga_manager *mgr,
> +				      struct fpga_image_info *info,
> +				      const char *buf, size_t count)
> +{
> +	if (mgr->mops->write_init)

Will you need a if (mgr->mops && mgr->mops->write_init) here later?
> +		return  mgr->mops->write_init(mgr, info, buf, count);
> +	return 0;
> +}
> +
>  /**
>   * fpga_image_info_alloc - Allocate an FPGA image info struct
>   * @dev: owning device
> @@ -83,9 +92,9 @@ static int fpga_mgr_write_init_buf(struct fpga_manager *mgr,
>  
>  	mgr->state = FPGA_MGR_STATE_WRITE_INIT;
>  	if (!mgr->mops->initial_header_size)
> -		ret = mgr->mops->write_init(mgr, info, NULL, 0);
> +		ret = fpga_mgr_write_init(mgr, info, NULL, 0);
>  	else
> -		ret = mgr->mops->write_init(
> +		ret = fpga_mgr_write_init(
>  		    mgr, info, buf, min(mgr->mops->initial_header_size, count));
>  
>  	if (ret) {
> @@ -569,7 +578,7 @@ struct fpga_manager *fpga_mgr_create(struct device *parent, const char *name,
>  	int id, ret;
>  
>  	if (!mops || !mops->write_complete || !mops->state ||
> -	    !mops->write_init || (!mops->write && !mops->write_sg) ||
> +	    (!mops->write && !mops->write_sg) ||
>  	    (mops->write && mops->write_sg)) {
>  		dev_err(parent, "Attempt to register without fpga_manager_ops\n");
>  		return NULL;
> -- 
> 2.26.3
> 
Looks good to me, I might reword the commit message some when applying.

- Moritz