This is an updated version of the patchset to revert the commit 22a9189fd073db3d03a4cf8b8c098aa207602de1 (cdrom: use kmalloced buffers instead of buffers on stack): http://marc.info/?l=linux-scsi&m=121125981930673&w=2 The major change is that this version avoids DMA on the stack on all the platforms (for simplicity) while the previous version uses the dma_pad_mask on a non-coherent platform (in a bit hacky way). With thic patchset, blk_rq_map_kern() always uses the bounce buffers if a caller passes a stack buffer. ide-cd has a mechanism to handle DMA alignment and padding for SG_IO. This patchset extends the mechanism with regard to a stack buffer. This patchset is against -mm, replaces the following patches in -mm: cdrom-revert-commit-22a9189-cdrom-use-kmalloced-buffers-instead-of-buffers-on-stack.patch ide-use-the-dma-safe-check-for-req_type_ata_pc.patch block-add-blk_queue_update_dma_pad.patch block-use-arch_kmalloc_minalign-as-the-default-dma-pad-mask.patch The diffstat is: block/blk-map.c | 5 + block/blk-settings.c | 24 ++++- drivers/ata/libata-scsi.c | 3 +- drivers/cdrom/cdrom.c | 274 +++++++++++++++------------------------------ drivers/ide/ide-cd.c | 22 +++- drivers/scsi/sr.c | 20 +--- include/linux/blkdev.h | 1 + 7 files changed, 143 insertions(+), 206 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
