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authorGeert Uytterhoeven <geert+renesas@glider.be>2020-10-26 16:27:55 +0100
committerChristoph Hellwig <hch@lst.de>2020-10-29 16:59:34 +0100
commit48ab6d5d1f096d6fac5b59f94af0aa394115a001 (patch)
tree9ea2fc1ffdf3242038e3c384393a8a7efdf30232 /drivers/of
parentMerge tag 'x86-urgent-2020-10-27' of git://git.kernel.org/pub/scm/linux/kerne... (diff)
downloadlinux-48ab6d5d1f096d6fac5b59f94af0aa394115a001.tar.xz
linux-48ab6d5d1f096d6fac5b59f94af0aa394115a001.zip
dma-mapping: fix 32-bit overflow with CONFIG_ARM_LPAE=n
On r8a7791/koelsch and shmobile_defconfig, PCIe probing fails with: rcar-pcie fe000000.pcie: Adjusted size 0x0 invalid rcar-pcie: probe of fe000000.pcie failed with error -22 of_dma_get_range() returns the following map: cpu_start 0x40000000 dma_start 0x40000000 size 0x080000000 offset 0 cpu_start 0x00000000 dma_start 0x00000000 size 0x100000000 offset 0 If CONFIG_ARM_LPAE=n, dma_addr_t is 32-bit. Hence when assigning r->dma_start + r->size to dma_end, this value will be truncated to 32-bit, yielding zero when processing the second table entry. Consequently, both dma_start and dma_end will be zero, leading to a zero size. Fix this by changing the dma_start and dma_end variables from dma_addr_t to u64. Fixes: e0d072782c734d27 ("dma-mapping: introduce DMA range map, supplanting dma_pfn_offset") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/of')
-rw-r--r--drivers/of/device.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c
index 655dee422563..3a469c79e6b0 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -93,7 +93,7 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
{
const struct iommu_ops *iommu;
const struct bus_dma_region *map = NULL;
- dma_addr_t dma_start = 0;
+ u64 dma_start = 0;
u64 mask, end, size = 0;
bool coherent;
int ret;
@@ -109,10 +109,10 @@ int of_dma_configure_id(struct device *dev, struct device_node *np,
return ret == -ENODEV ? 0 : ret;
} else {
const struct bus_dma_region *r = map;
- dma_addr_t dma_end = 0;
+ u64 dma_end = 0;
/* Determine the overall bounds of all DMA regions */
- for (dma_start = ~(dma_addr_t)0; r->size; r++) {
+ for (dma_start = ~0ULL; r->size; r++) {
/* Take lower and upper limits */
if (r->dma_start < dma_start)
dma_start = r->dma_start;