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Date: Tue, 4 Sep 2007 11:07:20 -0500 From: Jeff Norden <jeff@...h.tntech.edu> To: alan@...hat.com CC: linux-kernel@...r.kernel.org Subject: [PATCH 1/1] pata_it821x: fix lost interrupt with atapi devices From: Jeff Norden <jnorden@...h.tntech.edu> Fix "lost" interrupt problem when using dma with CD/DVD drives in some configurations. This problem can make installing linux from media impossible for distro's that have switched to libata-only configurations. The simple fix is to eliminate the use of dma for reading drive status, etc, by checking the number of bytes to transferred. This change will only affect the behavior of atapi devices, not disks. There is more info at http://bugzilla.redhat.com/show_bug.cgi?id=242229 This patch is for 2.6.22.1 Signed-off-by: Jeff Norden <jnorden@...h.tntech.edu> --- --- pata_it821x.c.orig 2007-08-16 14:20:49.000000000 -0500 +++ pata_it821x.c 2007-08-31 16:09:22.000000000 -0500 @@ -533,6 +533,10 @@ static int it821x_check_atapi_dma(struct struct ata_port *ap = qc->ap; struct it821x_dev *itdev = ap->private_data; + /* Only use dma for transfers to/from the media. */ + if (qc->nbytes < 2048) + return -EOPNOTSUPP; + /* No ATAPI DMA in smart mode */ if (itdev->smart) return -EOPNOTSUPP; - 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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