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Date: Thu, 1 Nov 2007 10:50:36 +0000 From: Alan Cox <alan@...rguk.ukuu.org.uk> To: Tejun Heo <htejun@...il.com> Cc: Jeff Garzik <jeff@...zik.org>, Jens Axboe <jens.axboe@...cle.com>, Daniel Drake <dsd@...too.org>, linux list <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org Subject: Re: "Fix ATAPI transfer lengths" causes CD writing regression O> Hmmm.... reading ide-cd.c::cdrom_pc_intr(). OIC, ide-cd is dealing with > this problem by draining PIO after BMDMA engine is done. This is > possible for BMDMA engines as they simply step out when the SG entries > are exhausted; then, the interrupt handler kicks in and drains the > left-over using PIO. This just isn't possible with more modern DMA engines. Its not possible with old ones either - its a bug not a feature and is why there is special casing for stuff like promise where this hangs the chip. Alan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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