ia64/xen-unstable

annotate patches/linux-2.6.16.13/fix-ide-cd-pio-mode.patch @ 10171:ad33b3882867

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Fix IDE CD-drive PIO mode.
CD drives in PIO mode don't work under Xen because of a change in Linux
between 2.6.12 and 2.6.16, as a result of the following thread:
http://lists.parisc-linux.org/pipermail/parisc-linux/2005-August/027197.html

The change breaks systems which have highmem and a swiotlb because the
ide-cd driver doesn't use the swiotlb, resulting in read/writes to/from
highmem pages in PIO mode not working any longer. Xen kernels usually have
both highmem and a swiotlb.

Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
author cl349@firebug.cl.cam.ac.uk
date Wed May 24 19:41:47 2006 +0100 (2006-05-24)
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cl349@10171 1 diff -ru ../pristine-linux-2.6.16.13/drivers/ide/ide-lib.c ./drivers/ide/ide-lib.c
cl349@10171 2 --- ../pristine-linux-2.6.16.13/drivers/ide/ide-lib.c 2006-05-02 22:38:44.000000000 +0100
cl349@10171 3 +++ ./drivers/ide/ide-lib.c 2006-05-24 18:37:05.000000000 +0100
cl349@10171 4 @@ -410,10 +410,10 @@
cl349@10171 5 {
cl349@10171 6 u64 addr = BLK_BOUNCE_HIGH; /* dma64_addr_t */
cl349@10171 7
cl349@10171 8 - if (!PCI_DMA_BUS_IS_PHYS) {
cl349@10171 9 - addr = BLK_BOUNCE_ANY;
cl349@10171 10 - } else if (on && drive->media == ide_disk) {
cl349@10171 11 - if (HWIF(drive)->pci_dev)
cl349@10171 12 + if (on && drive->media == ide_disk) {
cl349@10171 13 + if (!PCI_DMA_BUS_IS_PHYS)
cl349@10171 14 + addr = BLK_BOUNCE_ANY;
cl349@10171 15 + else if (HWIF(drive)->pci_dev)
cl349@10171 16 addr = HWIF(drive)->pci_dev->dma_mask;
cl349@10171 17 }
cl349@10171 18