From 093a89d4c21701e61025386a08a2d1ec5d97c805 Mon Sep 17 00:00:00 2001 From: Alan Tull Date: Mon, 16 Apr 2018 20:43:37 -0700 Subject: [PATCH] fpga: fpga-region: comment on fpga_region_program_fpga locking Add a comment to the header of fpga_region_program_fpga() regarding locking of the bridges. Signed-off-by: Alan Tull Signed-off-by: Moritz Fischer Signed-off-by: Greg Kroah-Hartman --- 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 edab2a2e03ef..cb0603e07ff8 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)