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[media] v4l2 core: return -ENOTTY if an ioctl doesn't exist

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Currently, -EINVAL is used to return either when an IOCTL is not
implemented, or if the ioctl was not implemented.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2011-07-06 14:08:08 -03:00
parent c28f53f6cd
commit 9190d191b1
3 changed files with 10 additions and 9 deletions
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13
Documentation/DocBook/media/v4l/gen-errors.xml
View File

@ -30,13 +30,6 @@
allowed range. This is a widely used error code. See the individual
ioctl requests for specific causes.</entry>
</row>
<row>
<entry>EINVAL or ENOTTY</entry>
<entry>The ioctl is not supported by the driver, actually meaning that
the required functionality is not available, or the file
descriptor is not for a media device. The usage of EINVAL is
deprecated and will be fixed on a latter patch.</entry>
</row>
<row>
<entry>ENODEV</entry>
<entry>Device not found or was removed.</entry>
@ -45,6 +38,12 @@
<entry>ENOMEM</entry>
<entry>There's not enough memory to handle the desired operation.</entry>
</row>
<row>
<entry>ENOTTY</entry>
<entry>The ioctl is not supported by the driver, actually meaning that
the required functionality is not available, or the file
descriptor is not for a media device.</entry>
</row>
<row>
<entry>ENOSPC</entry>
<entry>On USB devices, the stream ioctl's can return this error, meaning

2
Documentation/DocBook/media/v4l/v4l2.xml
View File

@ -132,7 +132,9 @@ applications. -->
<date>2011-06-27</date>
<authorinitials>mcc, po</authorinitials>
<revremark>Documented that VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one.</revremark>
<revremark>Standardize an error code for invalid ioctl.</revremark>
</revision>
<revision>
<revnumber>2.6.39</revnumber>
<date>2011-03-01</date>

4
drivers/media/video/v4l2-ioctl.c
View File

@ -543,12 +543,12 @@ static long __video_do_ioctl(struct file *file,
struct v4l2_fh *vfh = NULL;
struct v4l2_format f_copy;
int use_fh_prio = 0;
long ret = -EINVAL;
long ret = -ENOTTY;
if (ops == NULL) {
printk(KERN_WARNING "videodev: \"%s\" has no ioctl_ops.\n",
vfd->name);
return -EINVAL;
return ret;
}
if ((vfd->debug & V4L2_DEBUG_IOCTL) &&