From 9c016d61097cc39427a2f5025bdd97ac633d26a6 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sun, 23 Dec 2012 14:39:32 +0100 Subject: [PATCH] Partly revert "[media] uvcvideo: Set error_idx properly for extended controls API failures" Commit f0ed2ce840b3 ("[media] uvcvideo: Set error_idx properly for extended controls API failures") causes user space to behave incorrectly on one of my test machines (there is no sound under KDE 4.9.4 using pulseaudio and there is a knotify4 process occupying one of the CPU cores 100% of the time). Reverting that commit entirely fixes the problem for me. However, commit f0ed2ce840b3 appears to do more than it follows from its changelog, because the changelog only says about the changes related to ctrls->error_idx, while the commit additionally changes error codes returned by various functions in uvc_ctrl.c and uvc_v4l2.c. It turns out that the changes of the returned error codes confuse the user spce, so it is sufficient to revert the part of commit f0ed2ce840b3 not mentioned in its changelog to fix the problem. [ 'ENOENT' is not a valid error return from an ioctl to begin with, and I don't understand how anybody ever even thought it would be. - Linus ] Signed-off-by: Rafael J. Wysocki Cc: Laurent Pinchart Cc: Mauro Carvalho Chehab Cc: Hans Verkuil Signed-off-by: Linus Torvalds --- drivers/media/usb/uvc/uvc_ctrl.c | 19 ++++++++----------- drivers/media/usb/uvc/uvc_v4l2.c | 12 +++++------- 2 files changed, 13 insertions(+), 18 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 516a5b188ea5..2bb7613ddebb 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1061,7 +1061,7 @@ int uvc_query_v4l2_ctrl(struct uvc_video_chain *chain, ctrl = uvc_find_control(chain, v4l2_ctrl->id, &mapping); if (ctrl == NULL) { - ret = -ENOENT; + ret = -EINVAL; goto done; } @@ -1099,13 +1099,12 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain, return -ERESTARTSYS; ctrl = uvc_find_control(chain, query_menu->id, &mapping); - if (ctrl == NULL) { - ret = -ENOENT; + if (ctrl == NULL || mapping->v4l2_type != V4L2_CTRL_TYPE_MENU) { + ret = -EINVAL; goto done; } - if (mapping->v4l2_type != V4L2_CTRL_TYPE_MENU || - query_menu->index >= mapping->menu_count) { + if (query_menu->index >= mapping->menu_count) { ret = -EINVAL; goto done; } @@ -1264,7 +1263,7 @@ static int uvc_ctrl_add_event(struct v4l2_subscribed_event *sev, unsigned elems) ctrl = uvc_find_control(handle->chain, sev->id, &mapping); if (ctrl == NULL) { - ret = -ENOENT; + ret = -EINVAL; goto done; } @@ -1415,7 +1414,7 @@ int uvc_ctrl_get(struct uvc_video_chain *chain, ctrl = uvc_find_control(chain, xctrl->id, &mapping); if (ctrl == NULL) - return -ENOENT; + return -EINVAL; return __uvc_ctrl_get(chain, ctrl, mapping, &xctrl->value); } @@ -1432,10 +1431,8 @@ int uvc_ctrl_set(struct uvc_video_chain *chain, int ret; ctrl = uvc_find_control(chain, xctrl->id, &mapping); - if (ctrl == NULL) - return -ENOENT; - if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR)) - return -EACCES; + if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0) + return -EINVAL; /* Clamp out of range values. */ switch (mapping->v4l2_type) { diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 8e056046bc20..f2ee8c6b0d8d 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -607,10 +607,8 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) ret = uvc_ctrl_get(chain, &xctrl); uvc_ctrl_rollback(handle); - if (ret < 0) - return ret == -ENOENT ? -EINVAL : ret; - - ctrl->value = xctrl.value; + if (ret >= 0) + ctrl->value = xctrl.value; break; } @@ -634,7 +632,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) ret = uvc_ctrl_set(chain, &xctrl); if (ret < 0) { uvc_ctrl_rollback(handle); - return ret == -ENOENT ? -EINVAL : ret; + return ret; } ret = uvc_ctrl_commit(handle, &xctrl, 1); if (ret == 0) @@ -661,7 +659,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) uvc_ctrl_rollback(handle); ctrls->error_idx = ret == -ENOENT ? ctrls->count : i; - return ret == -ENOENT ? -EINVAL : ret; + return ret; } } ctrls->error_idx = 0; @@ -691,7 +689,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg) ctrls->error_idx = (ret == -ENOENT && cmd == VIDIOC_S_EXT_CTRLS) ? ctrls->count : i; - return ret == -ENOENT ? -EINVAL : ret; + return ret; } } -- GitLab