From 80131fe06e0bdd7b429594493c1317ddede89a61 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 22 Jun 2012 06:37:38 -0300 Subject: [PATCH] [media] v4l2-dev.c: add debug sysfs entry Since this could theoretically change the debug value while in the middle of v4l2-ioctl.c, we make a copy of vfd->debug to ensure consistent debug behavior. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/v4l2-dev.c | 24 ++++++++++++++++++++++++ drivers/media/video/v4l2-ioctl.c | 9 +++++---- 2 files changed, 29 insertions(+), 4 deletions(-) diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c index 83dbb2ddff10..c2122e53f051 100644 --- a/drivers/media/video/v4l2-dev.c +++ b/drivers/media/video/v4l2-dev.c @@ -46,6 +46,29 @@ static ssize_t show_index(struct device *cd, return sprintf(buf, "%i\n", vdev->index); } +static ssize_t show_debug(struct device *cd, + struct device_attribute *attr, char *buf) +{ + struct video_device *vdev = to_video_device(cd); + + return sprintf(buf, "%i\n", vdev->debug); +} + +static ssize_t set_debug(struct device *cd, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct video_device *vdev = to_video_device(cd); + int res = 0; + u16 value; + + res = kstrtou16(buf, 0, &value); + if (res) + return res; + + vdev->debug = value; + return len; +} + static ssize_t show_name(struct device *cd, struct device_attribute *attr, char *buf) { @@ -56,6 +79,7 @@ static ssize_t show_name(struct device *cd, static struct device_attribute video_device_attrs[] = { __ATTR(name, S_IRUGO, show_name, NULL), + __ATTR(debug, 0644, show_debug, set_debug), __ATTR(index, S_IRUGO, show_index, NULL), __ATTR_NULL }; diff --git a/drivers/media/video/v4l2-ioctl.c b/drivers/media/video/v4l2-ioctl.c index 9ded54b16e88..273c6d7bef65 100644 --- a/drivers/media/video/v4l2-ioctl.c +++ b/drivers/media/video/v4l2-ioctl.c @@ -1999,6 +1999,7 @@ static long __video_do_ioctl(struct file *file, void *fh = file->private_data; struct v4l2_fh *vfh = NULL; int use_fh_prio = 0; + int debug = vfd->debug; long ret = -ENOTTY; if (ops == NULL) { @@ -2032,7 +2033,7 @@ static long __video_do_ioctl(struct file *file, } write_only = _IOC_DIR(cmd) == _IOC_WRITE; - if (write_only && vfd->debug > V4L2_DEBUG_IOCTL) { + if (write_only && debug > V4L2_DEBUG_IOCTL) { v4l_print_ioctl(vfd->name, cmd); pr_cont(": "); info->debug(arg, write_only); @@ -2054,8 +2055,8 @@ static long __video_do_ioctl(struct file *file, } done: - if (vfd->debug) { - if (write_only && vfd->debug > V4L2_DEBUG_IOCTL) { + if (debug) { + if (write_only && debug > V4L2_DEBUG_IOCTL) { if (ret < 0) printk(KERN_DEBUG "%s: error %ld\n", video_device_node_name(vfd), ret); @@ -2064,7 +2065,7 @@ done: v4l_print_ioctl(vfd->name, cmd); if (ret < 0) pr_cont(": error %ld\n", ret); - else if (vfd->debug == V4L2_DEBUG_IOCTL) + else if (debug == V4L2_DEBUG_IOCTL) pr_cont("\n"); else if (_IOC_DIR(cmd) == _IOC_NONE) info->debug(arg, write_only); -- 2.30.2