diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2009-06-22 16:54:27 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-02 16:31:58 -0700 |
| commit | c88667d608fd3491614b965c27a2d1b73a487872 (patch) | |
| tree | d2ab59a6bb0fb571fd7dd9fa36d2027da3778790 | |
| parent | 301c1074fae4197b12a9c36db8bc38480b51c283 (diff) | |
parport_pc: set properly the dma_mask for parport_pc device
commit dfa7c4d869b7d3d37b70f1de856f2901b6ebfcf0 upstream.
parport_pc_probe_port() creates the own 'parport_pc' device if the
device argument is NULL. Then parport_pc_probe_port() doesn't
initialize the dma_mask and coherent_dma_mask of the device and calls
dma_alloc_coherent with it. dma_alloc_coherent fails because
dma_alloc_coherent() doesn't accept the uninitialized dma_mask:
http://lkml.org/lkml/2009/6/16/150
Long ago, X86_32 and X86_64 had the own dma_alloc_coherent
implementations; X86_32 accepted a device having dma_mask that is not
initialized however X86_64 didn't. When we merged them, we chose to
prohibit a device having dma_mask that is not initialized. I think
that it's good to require drivers to set up dma_mask (and
coherent_dma_mask) properly if the drivers want DMA.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Reported-by: Malcom Blaney <malcolm.blaney@maptek.com.au>
Tested-by: Malcom Blaney <malcolm.blaney@maptek.com.au>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/parport/parport_pc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c index 65cf9c35ef33..7f0c60c35d18 100644 --- a/drivers/parport/parport_pc.c +++ b/drivers/parport/parport_pc.c @@ -2211,6 +2211,9 @@ struct parport *parport_pc_probe_port (unsigned long int base, if (IS_ERR(pdev)) return NULL; dev = &pdev->dev; + + dev->coherent_dma_mask = DMA_BIT_MASK(24); + dev->dma_mask = &dev->coherent_dma_mask; } ops = kmalloc(sizeof (struct parport_operations), GFP_KERNEL); |