Messages in this thread Patch in this message | | | Subject | [PATCH][RT] 2.6.24-rc5-rt1 drivers/dma/ioat_dma.c compile fix | From | Sven-Thorsten Dietrich <> | Date | Fri, 14 Dec 2007 19:56:13 -0800 |
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Hi Steve,
looks like this patch didn't make it into 2.6.23-rc5-rt1.
I refreshed Trem's final version - please review and include in the next RT release.
Thanks
Sven
On Tue, 2007-11-20 at 23:09 +0100, trem wrote: > Steven Rostedt wrote: > > On Fri, 16 Nov 2007, Nelson, Shannon wrote: > >> first->async_tx.phys; > >>> - __list_splice(&new_chain, ioat_chan->used_desc.prev); > >>> + list_splice_tail(&new_chain, ioat_chan->used_desc.prev); > >>> > >> NAK. > >> > >> These functions do insertions differently. The 'prev' is pointing > to > >> the last valid descriptor in the queue and you really want to get > the > >> new_chain stuck on after this. Your list_splice_tail() will insert > the > >> new_chain just before it which will muck up the order of the DMA > >> requests. > >> > >> You might have more success with > >> list_splice_tail(&new_chain, ioat_chan->used_desc); > >> where used_desc points to the whole list, rather than using > the .prev > >> pointer to a specific node. > >> > >> Please copy me on future ioatdma related comments. > >> > >
> Hi > > I've tried this change, but it still don't compile. So I propose this patch. > > regards, > trem
From: trem <tremyfr@yahoo.fr> Subject: Re: [PATCH][RT] 2.6.24-rc2-rt1 drivers/dma/ioat_dma.c compile fix
Steven Rostedt wrote: > On Fri, 16 Nov 2007, Nelson, Shannon wrote: >> first->async_tx.phys; >>> - __list_splice(&new_chain, ioat_chan->used_desc.prev); >>> + list_splice_tail(&new_chain, ioat_chan->used_desc.prev); >>> >> NAK. >> >> These functions do insertions differently. The 'prev' is pointing to >> the last valid descriptor in the queue and you really want to get the >> new_chain stuck on after this. Your list_splice_tail() will insert the >> new_chain just before it which will muck up the order of the DMA >> requests. >> >> You might have more success with >> list_splice_tail(&new_chain, ioat_chan->used_desc); >> where used_desc points to the whole list, rather than using the .prev >> pointer to a specific node. >> >> Please copy me on future ioatdma related comments. >> > > And people wonder why we post RT related patches to LKML. This is exactly > why! > > Thanks for the response Shannon! > > -- Steve >
Hi
I've tried this change, but it still don't compile. So I propose this patch.
regards, trem
Acked-by: Sven-Thorsten Dietrich <sdietrich@suse.de>
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--- drivers/dma/ioat_dma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6.23/drivers/dma/ioat_dma.c =================================================================== --- linux-2.6.23.orig/drivers/dma/ioat_dma.c +++ linux-2.6.23/drivers/dma/ioat_dma.c @@ -260,7 +260,7 @@ static dma_cookie_t ioat1_tx_submit(stru /* write address into NextDescriptor field of last desc in chain */ to_ioat_desc(ioat_chan->used_desc.prev)->hw->next = first->async_tx.phys; - __list_splice(&new_chain, ioat_chan->used_desc.prev); + list_splice(&new_chain, &ioat_chan->used_desc); ioat_chan->dmacount += desc_count; ioat_chan->pending += desc_count;
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