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V4L/DVB (5399): Usbvideo module handling

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Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Oliver Neukum 2007-03-09 18:05:43 -03:00 committed by Mauro Carvalho Chehab
parent 5cdc178d1c
commit 5332bdbe9a
1 changed files with 7 additions and 11 deletions
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18
drivers/media/video/usbvideo/usbvideo.c
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@ -628,24 +628,21 @@ EXPORT_SYMBOL(usbvideo_HexDump);
/* ******************************************************************** */
/* XXX: this piece of crap really wants some error handling.. */
static void usbvideo_ClientIncModCount(struct uvd *uvd)
static int usbvideo_ClientIncModCount(struct uvd *uvd)
{
if (uvd == NULL) {
err("%s: uvd == NULL", __FUNCTION__);
return;
return -EINVAL;
}
if (uvd->handle == NULL) {
err("%s: uvd->handle == NULL", __FUNCTION__);
return;
}
if (uvd->handle->md_module == NULL) {
err("%s: uvd->handle->md_module == NULL", __FUNCTION__);
return;
return -EINVAL;
}
if (!try_module_get(uvd->handle->md_module)) {
err("%s: try_module_get() == 0", __FUNCTION__);
return;
return -ENODEV;
}
return 0;
}
static void usbvideo_ClientDecModCount(struct uvd *uvd)
@ -712,8 +709,6 @@ int usbvideo_register(
cams->num_cameras = num_cams;
cams->cam = (struct uvd *) &cams[1];
cams->md_module = md;
if (cams->md_module == NULL)
warn("%s: module == NULL!", __FUNCTION__);
mutex_init(&cams->lock); /* to 1 == available */
for (i = 0; i < num_cams; i++) {
@ -1119,7 +1114,8 @@ static int usbvideo_v4l_open(struct inode *inode, struct file *file)
if (uvd->debug > 1)
info("%s($%p)", __FUNCTION__, dev);
usbvideo_ClientIncModCount(uvd);
if (0 < usbvideo_ClientIncModCount(uvd))
return -ENODEV;
mutex_lock(&uvd->lock);
if (uvd->user) {