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fb: Flatten control flow in fb_set_var 

Instead of wiring almost everything down to the very last line using
goto soup (but not consistently, where would the fun be otherwise)
drop out early when checks fail. This allows us to flatten the huge
indent levels to just 1.

Aside: If a driver doesn't set ->fb_check_var, then FB_ACTIVATE_NOW
does nothing. This bug exists ever since this code was extracted as a
common helper in 2002, hence I decided against fixing it. Everyone
just better have a fb_check_var to make sure things work correctly.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: Peter Rosin <peda@axentia.se>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528090304.9388-28-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2019-05-28 11:02:58 +02:00
parent 3667617347
commit c428f35adf
1 changed files with 68 additions and 68 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

136
drivers/video/fbdev/core/fbmem.c
View File

@ -954,6 +954,9 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
{
int flags = info->flags;
int ret = 0;
u32 activate;
struct fb_var_screeninfo old_var;
struct fb_videomode mode;
if (var->activate & FB_ACTIVATE_INV_MODE) {
struct fb_videomode mode1, mode2;
@ -970,87 +973,84 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var)
fb_delete_videomode(&mode1, &info->modelist);
ret = (ret) ? -EINVAL : 0;
goto done;
return ret ? -EINVAL : 0;
}
if ((var->activate & FB_ACTIVATE_FORCE) ||
memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) {
u32 activate = var->activate;
if (!(var->activate & FB_ACTIVATE_FORCE) &&
!memcmp(&info->var, var, sizeof(struct fb_var_screeninfo)))
return 0;
/* When using FOURCC mode, make sure the red, green, blue and
* transp fields are set to 0.
*/
if ((info->fix.capabilities & FB_CAP_FOURCC) &&
var->grayscale > 1) {
if (var->red.offset || var->green.offset ||
var->blue.offset || var->transp.offset ||
var->red.length || var->green.length ||
var->blue.length || var->transp.length ||
var->red.msb_right || var->green.msb_right ||
var->blue.msb_right || var->transp.msb_right)
return -EINVAL;
}
activate = var->activate;
if (!info->fbops->fb_check_var) {
*var = info->var;
goto done;
}
/* When using FOURCC mode, make sure the red, green, blue and
* transp fields are set to 0.
*/
if ((info->fix.capabilities & FB_CAP_FOURCC) &&
var->grayscale > 1) {
if (var->red.offset || var->green.offset ||
var->blue.offset || var->transp.offset ||
var->red.length || var->green.length ||
var->blue.length || var->transp.length ||
var->red.msb_right || var->green.msb_right ||
var->blue.msb_right || var->transp.msb_right)
return -EINVAL;
}
ret = info->fbops->fb_check_var(var, info);
if (!info->fbops->fb_check_var) {
*var = info->var;
return 0;
}
ret = info->fbops->fb_check_var(var, info);
if (ret)
return ret;
if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW)
return 0;
if (info->fbops->fb_get_caps) {
ret = fb_check_caps(info, var, activate);
if (ret)
goto done;
return ret;
}
if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) {
struct fb_var_screeninfo old_var;
struct fb_videomode mode;
old_var = info->var;
info->var = *var;
if (info->fbops->fb_get_caps) {
ret = fb_check_caps(info, var, activate);
if (info->fbops->fb_set_par) {
ret = info->fbops->fb_set_par(info);
if (ret)
goto done;
}
old_var = info->var;
info->var = *var;
if (info->fbops->fb_set_par) {
ret = info->fbops->fb_set_par(info);
if (ret) {
info->var = old_var;
printk(KERN_WARNING "detected "
"fb_set_par error, "
"error code: %d\n", ret);
goto done;
}
}
fb_pan_display(info, &info->var);
fb_set_cmap(&info->cmap, info);
fb_var_to_videomode(&mode, &info->var);
if (info->modelist.prev && info->modelist.next &&
!list_empty(&info->modelist))
ret = fb_add_videomode(&mode, &info->modelist);
if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
struct fb_event event;
int evnt = (activate & FB_ACTIVATE_ALL) ?
FB_EVENT_MODE_CHANGE_ALL :
FB_EVENT_MODE_CHANGE;
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
event.data = &mode;
fb_notifier_call_chain(evnt, &event);
}
if (ret) {
info->var = old_var;
printk(KERN_WARNING "detected "
"fb_set_par error, "
"error code: %d\n", ret);
return ret;
}
}
done:
fb_pan_display(info, &info->var);
fb_set_cmap(&info->cmap, info);
fb_var_to_videomode(&mode, &info->var);
if (info->modelist.prev && info->modelist.next &&
!list_empty(&info->modelist))
ret = fb_add_videomode(&mode, &info->modelist);
if (!ret && (flags & FBINFO_MISC_USEREVENT)) {
struct fb_event event;
int evnt = (activate & FB_ACTIVATE_ALL) ?
FB_EVENT_MODE_CHANGE_ALL :
FB_EVENT_MODE_CHANGE;
info->flags &= ~FBINFO_MISC_USEREVENT;
event.info = info;
event.data = &mode;
fb_notifier_call_chain(evnt, &event);
}
return ret;
}
EXPORT_SYMBOL(fb_set_var);