Re: [patch 11/12] drivers/block/umem.c: Use the DMA_{64, 32}BIT_MASK constants

On 2005-06-21 at 09:19:39 +0200, Jens Axboe <[email protected]> wrote:
> On Mon, Jun 20 2005, [email protected] wrote:
> > From: Tobias Klauser <[email protected]>
> > 
> > 
> > 
> > Use the DMA_{64,32}BIT_MASK constants from dma-mapping.h when calling
> > pci_set_dma_mask() or pci_set_consistent_dma_mask()
> > These patches include dma-mapping.h explicitly because it caused errors
> > on some architectures otherwise.
> > See http://marc.theaimsgroup.com/?t=108001993000001&r=1&w=2 for details
> > 
> > Signed-off-by: Tobias Klauser <[email protected]>
> > Signed-off-by: Domen Puncer <[email protected]>
> > ---
> >  umem.c |    5 +++--
> >  1 files changed, 3 insertions(+), 2 deletions(-)
> > 
> > Index: quilt/drivers/block/umem.c
> > ===================================================================
> > --- quilt.orig/drivers/block/umem.c
> > +++ quilt/drivers/block/umem.c
> > @@ -50,6 +50,7 @@
> >  #include <linux/timer.h>
> >  #include <linux/pci.h>
> >  #include <linux/slab.h>
> > +#include <linux/dma-mapping.h>
> >  
> >  #include <linux/fcntl.h>        /* O_ACCMODE */
> >  #include <linux/hdreg.h>  /* HDIO_GETGEO */
> > @@ -892,8 +893,8 @@ static int __devinit mm_pci_probe(struct
> >  	printk(KERN_INFO "Micro Memory(tm) controller #%d found at %02x:%02x (PCI Mem Module (Battery Backup))\n",
> >  	       card->card_number, dev->bus->number, dev->devfn);
> >  
> > -	if (pci_set_dma_mask(dev, 0xffffffffffffffffLL) &&
> > -	    !pci_set_dma_mask(dev, 0xffffffffLL)) {
> > +	if (pci_set_dma_mask(dev, DMA_64BIT_MASK) &&
> > +	    !pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
> >  		printk(KERN_WARNING "MM%d: NO suitable DMA found\n",num_cards);
> >  		return  -ENOMEM;
> >  	}
> 
> Not from your patch, but that code looks a little strange. We error if
> setting a 64-bit mask fails _but_ the 32-bit one succeeds? That can't be
> right.

Oh yes. I remember Alexey Dobriyan bringing this up some time ago on the
kernel-janitor list:
http://lists.osdl.org/mailman/htdig/kernel-janitors/2005-May/004063.html

Thanks, Tobias
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• References:
  • [patch 11/12] drivers/block/umem.c: Use the DMA_{64, 32}BIT_MASK constants
    • From: [email protected]
  • Re: [patch 11/12] drivers/block/umem.c: Use the DMA_{64, 32}BIT_MASK constants
    • From: Jens Axboe <[email protected]>

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