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| author | James Hogan <james.hogan@imgtec.com> | 2015-03-27 08:33:43 +0000 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-10-28 16:38:04 +0100 |
| commit | 5c78135494fd42dfcf224f9b290c0ed9408da732 (patch) | |
| tree | 476544cbfcca53b8dce9db6002cb6f8381896147 /arch | |
| parent | bf020a9df55a36f51c0a92e353763f1c1c246642 (diff) | |
| download | lwn-5c78135494fd42dfcf224f9b290c0ed9408da732.tar.gz lwn-5c78135494fd42dfcf224f9b290c0ed9408da732.zip | |
MIPS: dma-default: Fix 32-bit fall back to GFP_DMA
commit 53960059d56ecef67d4ddd546731623641a3d2d1 upstream.
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: James Hogan <james.hogan@imgtec.com>
Fixes: a2e715a86c6d ("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
Patchwork: https://patchwork.linux-mips.org/patch/9610/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/mm/dma-default.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index 5f8b95512580..7dd78fc991bf 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -92,7 +92,7 @@ static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp) else #endif #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; else #endif |