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Subject[PATCH 06/10] video/uvc: use memweight()
Date
Use memweight() to count the total number of bits set in memory area.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: linux-media@vger.kernel.org
---
drivers/media/video/uvc/uvc_ctrl.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index 0efd3b1..8683be0 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -1851,7 +1851,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
/* Walk the entities list and instantiate controls */
list_for_each_entry(entity, &dev->entities, list) {
struct uvc_control *ctrl;
- unsigned int bControlSize = 0, ncontrols = 0;
+ unsigned int bControlSize = 0, ncontrols;
__u8 *bmControls = NULL;

if (UVC_ENTITY_TYPE(entity) == UVC_VC_EXTENSION_UNIT) {
@@ -1869,8 +1869,7 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
uvc_ctrl_prune_entity(dev, entity);

/* Count supported controls and allocate the controls array */
- for (i = 0; i < bControlSize; ++i)
- ncontrols += hweight8(bmControls[i]);
+ ncontrols = memweight(bmControls, bControlSize);
if (ncontrols == 0)
continue;

--
1.7.7.6


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