Messages in this thread | | | Date | Sun, 28 Feb 2010 22:14:27 -0700 | Subject | Re: [async_tx-next PATCH v2 2/2] fsldma: Fix cookie issues | From | Dan Williams <> |
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On Thu, Feb 25, 2010 at 12:39 PM, Steven J. Magnani <steve@digidescorp.com> wrote: > fsl_dma_update_completed_cookie() appears to calculate the last completed > cookie incorrectly in the corner case where DMA on cookie 1 is in progress > just following a cookie wrap. > > Signed-off-by: Steven J. Magnani <steve@digidescorp.com> > --- > diff -uprN a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c > --- a/drivers/dma/fsldma.c 2010-02-22 11:16:36.000000000 -0600 > +++ b/drivers/dma/fsldma.c 2010-02-22 11:08:41.000000000 -0600 > @@ -819,8 +819,11 @@ static void fsl_dma_update_completed_coo > desc = to_fsl_desc(chan->ld_running.prev); > if (dma_is_idle(chan)) > cookie = desc->async_tx.cookie; > - else > + else { > cookie = desc->async_tx.cookie - 1; > + if (unlikely(cookie < DMA_MIN_COOKIE)) > + cookie = DMA_MAX_COOKIE; > + } > > chan->completed_cookie = cookie; > > diff -uprN a/include/linux/dmaengine.h b/include/linux/dmaengine.h > --- a/include/linux/dmaengine.h 2010-02-22 11:18:11.000000000 -0600 > +++ b/include/linux/dmaengine.h 2010-02-22 11:18:30.000000000 -0600 > @@ -31,6 +31,8 @@ > * if dma_cookie_t is >0 it's a DMA request cookie, <0 it's an error code > */ > typedef s32 dma_cookie_t; > +#define DMA_MIN_COOKIE 1 > +#define DMA_MAX_COOKIE ((1 << 31) - 1) >
This patch introduces a new warning::
drivers/dma/fsldma.c:825: warning: integer overflow in expression
I'll fix this up to use INT_MAX instead.
-- Dan
powerpc-linux-gnu-gcc --version powerpc-linux-gnu-gcc (Sourcery G++ Lite 4.2-50) 4.2.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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