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drm: Reshuffle getfb error returns 

Make it a little more clear what's going on inside of getfb, and also
make it easier to add alternate paths to get a handle in future.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180323134553.15993-3-daniels@collabora.com
This commit is contained in:
Daniel Stone 2018-03-23 13:45:51 +00:00
parent 83fd26c3f3
commit 487da6172f
1 changed files with 18 additions and 16 deletions
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34
drivers/gpu/drm/drm_framebuffer.c
View File

@ -468,29 +468,31 @@ int drm_mode_getfb(struct drm_device *dev,
goto out;
}
if (!fb->funcs->create_handle) {
ret = -ENODEV;
goto out;
}
r->height = fb->height;
r->width = fb->width;
r->depth = fb->format->depth;
r->bpp = fb->format->cpp[0] * 8;
r->pitch = fb->pitches[0];
if (fb->funcs->create_handle) {
if (drm_is_current_master(file_priv) || capable(CAP_SYS_ADMIN) ||
drm_is_control_client(file_priv)) {
ret = fb->funcs->create_handle(fb, file_priv,
&r->handle);
} else {
/* GET_FB() is an unprivileged ioctl so we must not
* return a buffer-handle to non-master processes! For
* backwards-compatibility reasons, we cannot make
* GET_FB() privileged, so just return an invalid handle
* for non-masters. */
r->handle = 0;
ret = 0;
}
} else {
ret = -ENODEV;
/* GET_FB() is an unprivileged ioctl so we must not return a
* buffer-handle to non-master processes! For
* backwards-compatibility reasons, we cannot make GET_FB() privileged,
* so just return an invalid handle for non-masters.
*/
if (!drm_is_current_master(file_priv) && !capable(CAP_SYS_ADMIN) &&
!drm_is_control_client(file_priv)) {
r->handle = 0;
ret = 0;
goto out;
}
ret = fb->funcs->create_handle(fb, file_priv, &r->handle);
out:
drm_framebuffer_put(fb);