On Fri, Nov 04, 2005 at 01:41:06PM +0000, Alan Cox wrote: > While writing the new sl82c05 driver I noticed a real nasty lurking in > the old code. According to the errata docs you have to reset the DMA > engine every transfer to work around chip errata. It also says that this > resets any other ATA transfer in progress. > > If both channels are in use there is no locking between the channels to > stop a reset on one channel as DMA begins making a mess of the other > channel. Looks like serialize should be set on the driver ? Possibly, though benh needs to comment. (I think benh has the only hardware which has the possibility of both channels - the NetWinder only has one channel with one disk.) -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 Serial core - 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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