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| author |   Rene Herman <rene.herman@keyaccess.nl> | 2008-07-25 19:44:45 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-26 12:00:02 -0700 |
| commit | 00412be1d7bdf451653c7dafeb09f4f83398d756 (patch) | |
| tree | 3f610f3fd8004de0195eaaa901be490def665722 | |
| parent | pnp: set the pnp_card dma_mask for use by ISAPnP cards (diff) | |
| download | linux-dev-00412be1d7bdf451653c7dafeb09f4f83398d756.tar.xz linux-dev-00412be1d7bdf451653c7dafeb09f4f83398d756.zip | |
isa: set 24-bit dma_mask for ISA devices
dma_alloc_coherent() on x86 currently takes a passed in NULL device
pointer to mean that it should allocate an ISA compatible (24-bit) buffer
which is a bit of a hack.
The ALSA ISA drivers are the main consumers of this but have a struct
device in fact readily available.
For the legacy drivers, this sets the device dma_mask in preparation for
using the actual device with the DMA API so as to eventually not need the
NULL hack in dma_alloc_coherent().
This does not fix a current bug -- 2.6.26-rc1 stumbled over the NULL hack
in dma_alloc_coherent() but this has already been fixed in commit
4a367f3a9dbf2e7ffcee4702203479809236ee6e by Takashi Iwai.
Signed-off-by: Rene Herman <rene.herman@gmail.com>
Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/base/isa.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/base/isa.c b/drivers/base/isa.c index d2222397a401..efd577574948 100644 --- a/drivers/base/isa.c +++ b/drivers/base/isa.c @@ -7,6 +7,7 @@ #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> +#include <linux/dma-mapping.h> #include <linux/isa.h> static struct device isa_bus = { @@ -141,6 +142,9 @@ int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev) isa_dev->dev.release = isa_dev_release; isa_dev->id = id; + isa_dev->dev.coherent_dma_mask = DMA_24BIT_MASK; + isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask; + error = device_register(&isa_dev->dev); if (error) { put_device(&isa_dev->dev); |