[PATCH v3 02/13] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[mirq-linux@xxxxxxxxxxxx (Michał Mirosław)]

Interpret (otherwise-invalid) NULL apertures argument to mean all-memory
range. This will allow to remove several duplicates of this code
from drivers in following patches.

Signed-off-by: MichaÅ? MirosÅ?aw <mirq-linux at rere.qmqm.pl>
Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie at samsung.com>

---
v2: added kerneldoc to corresponding DRM helper
v3: split kerneldoc to another patch
---
 drivers/video/fbdev/core/fbmem.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c
index 30a18d4c9de4..0df148eb4699 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1779,11 +1779,25 @@ int remove_conflicting_framebuffers(struct apertures_struct *a,
 				    const char *name, bool primary)
 {
 	int ret;
+	bool do_free = false;
+
+	if (!a) {
+		a = alloc_apertures(1);
+		if (!a)
+			return -ENOMEM;
+
+		a->ranges[0].base = 0;
+		a->ranges[0].size = ~0;
+		do_free = true;
+	}
 
 	mutex_lock(&registration_lock);
 	ret = do_remove_conflicting_framebuffers(a, name, primary);
 	mutex_unlock(&registration_lock);
 
+	if (do_free)
+		kfree(a);
+
 	return ret;
 }
 EXPORT_SYMBOL(remove_conflicting_framebuffers);
-- 
2.18.0