diff options
| author | James Hogan <james.hogan@imgtec.com> | 2015-03-27 08:33:43 +0000 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-08-26 20:44:52 +0200 |
| commit | ee7eb39ba12cd463c4ad20ff98ac47d9f39606d0 (patch) | |
| tree | 2e2db5c0d45247d32dc3e7456e164dbb9d0437dd /arch | |
| parent | 115adcdf99ea84a3fb41513938467ed8e4bd0758 (diff) | |
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Guendhoer <stefan@guendhoer.com>
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 23129d100..5fa55b80b 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -91,7 +91,7 @@ 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 |