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authorSven Schnelle <svens@stackframe.org>2019-09-24 17:01:31 +0200
committerHelge Deller <deller@gmx.de>2019-10-14 21:44:26 +0200
commitc32c47aa364096124c9c69c1a44918433832562b (patch)
tree8864eca46dee1310d505afe8b3371abd51e8359a /drivers/parisc
parent513f7f747e1cba81f28a436911fba0b485878ebd (diff)
downloadlinux-c32c47aa364096124c9c69c1a44918433832562b.tar.bz2
parisc: Remove 32-bit DMA enforcement from sba_iommu
This breaks booting from sata_sil24 with the recent DMA change. According to James Bottomley this was in to improve performance by kicking the device into 32 bit descriptors, which are usually more efficient, especially with older dual descriptor format cards like we have on parisc systems. Remove it for now to make DMA working again. Fixes: dcc02c19cc06 ("sata_sil24: use dma_set_mask_and_coherent") Signed-off-by: Sven Schnelle <svens@stackframe.org> Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'drivers/parisc')
-rw-r--r--drivers/parisc/sba_iommu.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c
index ed50502cc65a..de8e4e347249 100644
--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -678,14 +678,6 @@ static int sba_dma_supported( struct device *dev, u64 mask)
return(0);
}
- /* Documentation/DMA-API-HOWTO.txt tells drivers to try 64-bit
- * first, then fall back to 32-bit if that fails.
- * We are just "encouraging" 32-bit DMA masks here since we can
- * never allow IOMMU bypass unless we add special support for ZX1.
- */
- if (mask > ~0U)
- return 0;
-
ioc = GET_IOC(dev);
if (!ioc)
return 0;