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[media] v4l2-dev.c: add debug sysfs entry

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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 <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2012-06-22 06:37:38 -03:00 committed by Mauro Carvalho Chehab
parent f18d8e07b2
commit 80131fe06e
2 changed files with 29 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/media/video/v4l2-dev.c
View File

@ -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
};

9
drivers/media/video/v4l2-ioctl.c
View File

@ -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);