linux-kernel - [PATCH] drivers: cma: fix addressing on PAE machines

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Date:	Fri, 30 Nov 2012 07:58:03 -0500
From:	Vitaly Andrianov <vitalya@...com>
To:	<mina86@...a86.com>, <m.szyprowski@...sung.com>,
	<kyungmin.park@...sung.com>, <arnd@...db.de>,
	<linux-kernel@...r.kernel.org>, <linux-keystone@...t.ti.com>
CC:	Vitaly Andrianov <vitalya@...com>, Cyril Chemparathy <cyril@...com>
Subject: [PATCH] drivers: cma: fix addressing on PAE machines

This patch fixes a couple of bugs that otherwise impair CMA functionality on
PAE machines:

  - alignment must be a 64-bit type when running on systems with 64-bit
    physical addresses.  If this is not the case, the limit calculation thunks
    allocations down to an address range < 4G.

  - The allocated range check is removed. On 32bit ARM kernel with LPAE
    enabled the base may be allocated outside the fist 4GB of physical
    memory (keystone SoC for example).

Signed-off-by: Vitaly Andrianov <vitalya@...com>
Signed-off-by: Cyril Chemparathy <cyril@...com>
---
 drivers/base/dma-contiguous.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 9a14694..7936b2e 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -234,7 +234,7 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
 				  phys_addr_t base, phys_addr_t limit)
 {
 	struct cma_reserved *r = &cma_reserved[cma_reserved_count];
-	unsigned long alignment;
+	phys_addr_t alignment;
 
 	pr_debug("%s(size %lx, base %08lx, limit %08lx)\n", __func__,
 		 (unsigned long)size, (unsigned long)base,
@@ -271,10 +271,6 @@ int __init dma_declare_contiguous(struct device *dev, unsigned long size,
 		if (!addr) {
 			base = -ENOMEM;
 			goto err;
-		} else if (addr + size > ~(unsigned long)0) {
-			memblock_free(addr, size);
-			base = -EINVAL;
-			goto err;
 		} else {
 			base = addr;
 		}
-- 
1.7.9.5

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