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ARM: dma-mapping: check DMA mask against available memory

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Some buses have negative offsets, which causes the DMA mask checks to
falsely fail.  Fix this by using the actual amount of memory fitted in
the system.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-11-25 21:52:25 +00:00
parent 6ce4eac1f6
commit 11a5aa3256
1 changed files with 7 additions and 2 deletions
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9
arch/arm/mm/dma-mapping.c
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@ -9,6 +9,7 @@
*
* DMA uncached mapping support.
*/
#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/gfp.h>
@ -162,6 +163,8 @@ static u64 get_coherent_dma_mask(struct device *dev)
u64 mask = (u64)DMA_BIT_MASK(32);
if (dev) {
unsigned long max_dma_pfn;
mask = dev->coherent_dma_mask;
/*
@ -173,6 +176,8 @@ static u64 get_coherent_dma_mask(struct device *dev)
return 0;
}
max_dma_pfn = min(max_pfn, arm_dma_pfn_limit);
/*
* If the mask allows for more memory than we can address,
* and we actually have that much memory, then fail the
@ -180,7 +185,7 @@ static u64 get_coherent_dma_mask(struct device *dev)
*/
if (sizeof(mask) != sizeof(dma_addr_t) &&
mask > (dma_addr_t)~0 &&
dma_to_pfn(dev, ~0) > arm_dma_pfn_limit) {
dma_to_pfn(dev, ~0) > max_dma_pfn) {
dev_warn(dev, "Coherent DMA mask %#llx is larger than dma_addr_t allows\n",
mask);
dev_warn(dev, "Driver did not use or check the return value from dma_set_coherent_mask()?\n");
@ -192,7 +197,7 @@ static u64 get_coherent_dma_mask(struct device *dev)
* fits within the allowable addresses which we can
* allocate.
*/
if (dma_to_pfn(dev, mask) < arm_dma_pfn_limit) {
if (dma_to_pfn(dev, mask) < max_dma_pfn) {
dev_warn(dev, "Coherent DMA mask %#llx (pfn %#lx-%#lx) covers a smaller range of system memory than the DMA zone pfn 0x0-%#lx\n",
mask,
dma_to_pfn(dev, 0), dma_to_pfn(dev, mask) + 1,