linux-kernel - Re: [PATCH] fpga: fpga-region: comment on fpga_region_program

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Date:   Thu, 25 Jan 2018 11:09:50 -0800
From:   Moritz Fischer <mdf@...nel.org>
To:     Alan Tull <atull@...nel.org>
Cc:     Moritz Fischer <mdf@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: Re: [PATCH] fpga: fpga-region: comment on fpga_region_program_fpga
 locking

Hi Alan,

looks good.

On Thu, Jan 25, 2018 at 09:39:22AM -0600, Alan Tull wrote:
> Add a comment to the header of fpga_region_program_fpga()
> regarding locking of the bridges.
> 
> Signed-off-by: Alan Tull <atull@...nel.org>
Acked-by: Moritz Fischer <mdf@...nel.org>
> ---
>  drivers/fpga/fpga-region.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
> index edab2a2..cb0603e 100644
> --- a/drivers/fpga/fpga-region.c
> +++ b/drivers/fpga/fpga-region.c
> @@ -95,6 +95,11 @@ static void fpga_region_put(struct fpga_region *region)
>   * fpga_region_program_fpga - program FPGA
>   * @region: FPGA region
>   * Program an FPGA using fpga image info (region->info).
> + * If the region has a get_bridges function, the exclusive reference for the
> + * bridges will be held if programming succeeds.  This is intended to prevent
> + * reprogramming the region until the caller considers it safe to do so.
> + * The caller will need to call fpga_bridges_put() before attempting to
> + * reprogram the region.
>   * Return 0 for success or negative error code.
>   */
>  int fpga_region_program_fpga(struct fpga_region *region)
> -- 
> 2.7.4
> 

- Moritz

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