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| author | Sricharan R <sricharan@codeaurora.org> | 2017-04-10 14:21:00 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2017-04-20 17:31:06 +0300 |
| commit | efc8551a276faab19d85079da02c5fb602b0dcbe (patch) | |
| tree | d4bc742878d00fba40a4b2de45eedbac7ae1aa5c /drivers | |
| parent | 1d9029d440e40b276c0691caed1de10c42d96bef (diff) | |
| download | linux-efc8551a276faab19d85079da02c5fb602b0dcbe.tar.xz | |
of: device: Fix overflow of coherent_dma_mask
Size of the dma-range is calculated as coherent_dma_mask + 1
and passed to arch_setup_dma_ops further. It overflows when
the coherent_dma_mask is set for full 64 bits 0xFFFFFFFFFFFFFFFF,
resulting in size getting passed as 0 wrongly. Fix this by
passsing in max(mask, mask + 1). Note that in this case
when the mask is set to full 64bits, we will be passing the mask
itself to arch_setup_dma_ops instead of the size. The real fix
for this should be to make arch_setup_dma_ops receive the
mask and handle it, to be done in the future.
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/of/device.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c index 0d378c03e1a4..e1ae9e7104a1 100644 --- a/drivers/of/device.c +++ b/drivers/of/device.c @@ -107,7 +107,7 @@ void of_dma_configure(struct device *dev, struct device_node *np) ret = of_dma_get_range(np, &dma_addr, &paddr, &size); if (ret < 0) { dma_addr = offset = 0; - size = dev->coherent_dma_mask + 1; + size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); } else { offset = PFN_DOWN(paddr - dma_addr); |