From: Rebecca Schultz Zavin <rebecca@android.com>
Date: Wed, 22 Aug 2012 04:35:20 +0000 (-0700)
Subject: gpu: ion: Switch to using kmalloc rather than kmap during allocation
X-Git-Tag: firefly_0821_release~4090^2~688
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9993b96e30cebbbfdce64775876ae7338bcfc10d;p=firefly-linux-kernel-4.4.55.git

gpu: ion: Switch to using kmalloc rather than kmap during allocation

Previously, metadata was stored in the allocated pages themselves
during allocation.  However the system can only have a limited
number of kmapped pages.  A very large allocation might exceed
this limit.

Change-Id: Ibe972096e83924bf5e621d8282c4cd133ca75b0a
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
---

diff --git a/drivers/gpu/ion/ion_system_heap.c b/drivers/gpu/ion/ion_system_heap.c
index e7fb07d45a2a..ca6de04f6c29 100644
--- a/drivers/gpu/ion/ion_system_heap.c
+++ b/drivers/gpu/ion/ion_system_heap.c
@@ -46,7 +46,7 @@ static struct page_info *alloc_largest_available(unsigned long size)
 		if (!page)
 			continue;
 		split_page(page, orders[i]);
-		info = kmap(page);
+		info = kmalloc(sizeof(struct page_info *), GFP_KERNEL);
 		info->page = page;
 		info->order = orders[i];
 		return info;
@@ -93,7 +93,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap,
 		}
 		list_del(&info->list);
 		memset(info, 0, sizeof(struct page_info));
-		kunmap(page);
+		kfree(info);
 	}
 
 	dma_sync_sg_for_device(NULL, table->sgl, table->nents,
@@ -107,7 +107,7 @@ err:
 	list_for_each_entry(info, &pages, list) {
 		for (i = 0; i < (1 << info->order); i++)
 			__free_page(info->page + i);
-		kunmap(info->page);
+		kfree(info);
 	}
 	return -ENOMEM;
 }