From dfa7c4d869b7d3d37b70f1de856f2901b6ebfcf0 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Date: Mon, 22 Jun 2009 16:54:27 +0100 Subject: [PATCH] parport_pc: set properly the dma_mask for parport_pc device 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> Cc: stable@kernel.org 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> --- drivers/parport/parport_pc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c index 7f1cca701c11..1032d5fdbd42 100644 --- a/drivers/parport/parport_pc.c +++ b/drivers/parport/parport_pc.c @@ -2290,6 +2290,9 @@ 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); -- GitLab