From e64025850d11afd0a9ad14d40310bec7ff0f4847 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Tue, 14 Jun 2011 10:56:42 -0300 Subject: [PATCH] [media] v4l2-ctrls: split try_or_set_ext_ctrls() Split try_or_set_ext_ctrls() into a validate_ctrls() part ('Phase 1') and merge the second part ('Phase 2') into try_set_ext_ctrls(). This makes a lot more sense and it also does the validation before trying to try/set the controls. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/v4l2-ctrls.c | 88 +++++++++++++++----------------- 1 file changed, 41 insertions(+), 47 deletions(-) diff --git a/drivers/media/video/v4l2-ctrls.c b/drivers/media/video/v4l2-ctrls.c index 4ec3cfbdc3ae..eb6d6fd9b92d 100644 --- a/drivers/media/video/v4l2-ctrls.c +++ b/drivers/media/video/v4l2-ctrls.c @@ -1801,8 +1801,8 @@ EXPORT_SYMBOL(v4l2_ctrl_g_ctrl); /* Core function that calls try/s_ctrl and ensures that the new value is copied to the current value on a set. Must be called with ctrl->handler->lock held. */ -static int try_or_set_control_cluster(struct v4l2_fh *fh, - struct v4l2_ctrl *master, bool set) +static int try_or_set_cluster(struct v4l2_fh *fh, + struct v4l2_ctrl *master, bool set) { bool update_flag; int ret; @@ -1844,23 +1844,18 @@ static int try_or_set_control_cluster(struct v4l2_fh *fh, return 0; } -/* Try or set controls. */ -static int try_or_set_ext_ctrls(struct v4l2_fh *fh, - struct v4l2_ctrl_handler *hdl, - struct v4l2_ext_controls *cs, - struct v4l2_ctrl_helper *helpers, - bool set) +/* Validate controls. */ +static int validate_ctrls(struct v4l2_ext_controls *cs, + struct v4l2_ctrl_helper *helpers, bool set) { - unsigned i, j; + unsigned i; int ret = 0; - /* Phase 1: validation */ cs->error_idx = cs->count; for (i = 0; i < cs->count; i++) { struct v4l2_ctrl *ctrl = helpers[i].ctrl; - if (!set) - cs->error_idx = i; + cs->error_idx = i; if (ctrl->flags & V4L2_CTRL_FLAG_READ_ONLY) return -EACCES; @@ -1876,8 +1871,38 @@ static int try_or_set_ext_ctrls(struct v4l2_fh *fh, if (ret) return ret; } + return 0; +} + +/* Try or try-and-set controls */ +static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, + struct v4l2_ext_controls *cs, + bool set) +{ + struct v4l2_ctrl_helper helper[4]; + struct v4l2_ctrl_helper *helpers = helper; + unsigned i, j; + int ret; + + cs->error_idx = cs->count; + cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class); + + if (hdl == NULL) + return -EINVAL; + + if (cs->count == 0) + return class_check(hdl, cs->ctrl_class); - /* Phase 2: set/try controls */ + if (cs->count > ARRAY_SIZE(helper)) { + helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL); + if (!helpers) + return -ENOMEM; + } + ret = prepare_ext_ctrls(hdl, cs, helpers); + if (!ret) + ret = validate_ctrls(cs, helpers, set); + if (ret && set) + cs->error_idx = cs->count; for (i = 0; !ret && i < cs->count; i++) { struct v4l2_ctrl *master; u32 idx = i; @@ -1902,50 +1927,19 @@ static int try_or_set_ext_ctrls(struct v4l2_fh *fh, } while (!ret && idx); if (!ret) - ret = try_or_set_control_cluster(fh, master, set); + ret = try_or_set_cluster(fh, master, set); /* Copy the new values back to userspace. */ if (!ret) { idx = i; do { ret = user_to_new(cs->controls + idx, - helpers[idx].ctrl); + helpers[idx].ctrl); idx = helpers[idx].next; } while (!ret && idx); } v4l2_ctrl_unlock(master); } - return ret; -} - -/* Try or try-and-set controls */ -static int try_set_ext_ctrls(struct v4l2_fh *fh, struct v4l2_ctrl_handler *hdl, - struct v4l2_ext_controls *cs, - bool set) -{ - struct v4l2_ctrl_helper helper[4]; - struct v4l2_ctrl_helper *helpers = helper; - int ret; - - cs->error_idx = cs->count; - cs->ctrl_class = V4L2_CTRL_ID2CLASS(cs->ctrl_class); - - if (hdl == NULL) - return -EINVAL; - - if (cs->count == 0) - return class_check(hdl, cs->ctrl_class); - - if (cs->count > ARRAY_SIZE(helper)) { - helpers = kmalloc(sizeof(helper[0]) * cs->count, GFP_KERNEL); - if (!helpers) - return -ENOMEM; - } - ret = prepare_ext_ctrls(hdl, cs, helpers); - if (!ret) - ret = try_or_set_ext_ctrls(fh, hdl, cs, helpers, set); - else if (set) - cs->error_idx = cs->count; if (cs->count > ARRAY_SIZE(helper)) kfree(helpers); @@ -1997,7 +1991,7 @@ static int set_ctrl(struct v4l2_fh *fh, struct v4l2_ctrl *ctrl, s32 *val) ctrl->val = *val; ctrl->is_new = 1; - ret = try_or_set_control_cluster(fh, master, true); + ret = try_or_set_cluster(fh, master, true); *val = ctrl->cur.val; v4l2_ctrl_unlock(ctrl); return ret; -- 2.30.2