[PATCH 10/13] fbdev: allow apertures == NULL in remove_conflicting_framebuffers()

[Michał Mirosław <mirq-linux@xxxxxxxxxxxx>]

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: Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
---
 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 5ea980e5d3b7..927e016487e9 100644
--- a/drivers/video/fbdev/core/fbmem.c
+++ b/drivers/video/fbdev/core/fbmem.c
@@ -1780,11 +1780,25 @@ 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);
-- 
2.11.0

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