Commit 53960059 authored by James Hogan's avatar James Hogan Committed by Ralf Baechle

MIPS: dma-default: Fix 32-bit fall back to GFP_DMA

If there is a DMA zone (usually 24bit = 16MB I believe), but no DMA32
zone, as is the case for some 32-bit kernels, then massage_gfp_flags()
will cause DMA memory allocated for devices with a 32..63-bit
coherent_dma_mask to fall back to using __GFP_DMA, even though there may
only be 32-bits of physical address available anyway.

Correct that case to compare against a mask the size of phys_addr_t
instead of always using a 64-bit mask.
Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Fixes: a2e715a8 ("MIPS: DMA: Fix computation of DMA flags from device's coherent_dma_mask.")
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: <stable@vger.kernel.org> # 2.6.36+
Patchwork: https://patchwork.linux-mips.org/patch/9610/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 96fc7a9c
...@@ -100,7 +100,7 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) ...@@ -100,7 +100,7 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
else else
#endif #endif
#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32) #if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
if (dev->coherent_dma_mask < DMA_BIT_MASK(64)) if (dev->coherent_dma_mask < DMA_BIT_MASK(sizeof(phys_addr_t) * 8))
dma_flag = __GFP_DMA; dma_flag = __GFP_DMA;
else else
#endif #endif
......
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