On Mon, Oct 04, 2010 at 10:55:08PM +0200, Björn Smedman wrote: > Hi all, > > I've been looking at how ath9k does DMA and comparing with the > recommendations in the Linux kernel documentation for the DMA API[1]. To > me it looks like we risk setting up incorrect DMA descriptors on > platforms that can reorder writes because all data in the descriptor may > not be written to memory before the descriptor is linked into the DMA > chain. > > The patch below attempts to remove this risk by inserting a write memory > barrier between where we set up a descriptor and where we add it to the > DMA chain. My hope is that this may solve some of the harder chip lockups > on MIPS but more testing is required to determine if it has this effect. > > Any thoughts? > > /Björn > > 1. http://www.mjmwired.net/kernel/Documentation/DMA-API.txt I think this seems OK...? John -- John W. Linville Someday the world will need a hero, and you linville@xxxxxxxxxxxxx might be all we have. Be ready. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
