ide-cd: fix DMA alignment regression
e5318b53 ("ide: use the dma safe check for REQ_TYPE_ATA_PC") introduced a regression which caused some ATAPI drives to turn off DMA for REQ_TYPE_BLOCK_PC commands while burning and thus degrading performance and ultimately causing an excessive amount of underruns. The issue is documented also in: http://bugzilla.kernel.org/show_bug.cgi?id=11742. Signed-off-by: NBorislav Petkov <petkovbb@gmail.com> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Tested-by: NValerio Passini <valerio.passini@unicam.it> [bart: fixup patch description per comments from Sergei Shtylyov] Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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