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authorAlan Tull <atull@kernel.org>2018-04-16 20:43:37 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-04-23 13:33:01 +0200
commit093a89d4c21701e61025386a08a2d1ec5d97c805 (patch)
tree8946b7d0eaacfee634419c7129cd3f7487fe7202 /drivers/fpga
parent88fb3a0023307356a05f6b8e61a0ccddc6d32b2c (diff)
downloadlinux-093a89d4c21701e61025386a08a2d1ec5d97c805.tar.bz2
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 <atull@kernel.org> Signed-off-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/fpga-region.c5
1 files changed, 5 insertions, 0 deletions
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)