diff options
| author | Nicolás Reynolds <apoyosis@correo.inta.gob.ar> | 2011-03-09 17:10:00 -0300 |
|---|---|---|
| committer | Nicolás Reynolds <apoyosis@correo.inta.gob.ar> | 2011-03-09 17:10:00 -0300 |
| commit | f078deb8b369742fb70acb7c0894af41cafd983b (patch) | |
| tree | 696a77319a2841f29bd5e5635424fbeaf77f699f /libre/kernel26-libre-lts/libata-alignment.patch | |
| parent | 17585f4b12522f49adb24120a4bf39157577ae68 (diff) | |
kernel26-libre-lts-2.6.32.32-1
Diffstat (limited to 'libre/kernel26-libre-lts/libata-alignment.patch')
| -rw-r--r-- | libre/kernel26-libre-lts/libata-alignment.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libre/kernel26-libre-lts/libata-alignment.patch b/libre/kernel26-libre-lts/libata-alignment.patch new file mode 100644 index 000000000..edd96f3b1 --- /dev/null +++ b/libre/kernel26-libre-lts/libata-alignment.patch @@ -0,0 +1,48 @@ +diff -Nur linux-2.6.32.orig/drivers/ata/libata-scsi.c linux-2.6.32/drivers/ata/libata-scsi.c +--- linux-2.6.32.orig/drivers/ata/libata-scsi.c 2009-12-03 14:51:21.000000000 +1100 ++++ linux-2.6.32/drivers/ata/libata-scsi.c 2011-01-22 20:32:53.353775375 +1100 +@@ -1099,13 +1099,13 @@ + /* configure max sectors */ + blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); + ++ sdev->sector_size = ATA_SECT_SIZE; ++ + if (dev->class == ATA_DEV_ATAPI) { + struct request_queue *q = sdev->request_queue; + void *buf; + +- /* set the min alignment and padding */ +- blk_queue_update_dma_alignment(sdev->request_queue, +- ATA_DMA_PAD_SZ - 1); ++ /* set DMA padding */ + blk_queue_update_dma_pad(sdev->request_queue, + ATA_DMA_PAD_SZ - 1); + +@@ -1119,12 +1119,24 @@ + + blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN); + } else { +- /* ATA devices must be sector aligned */ +- blk_queue_update_dma_alignment(sdev->request_queue, +- ATA_SECT_SIZE - 1); + sdev->manage_start_stop = 1; + } + ++ /* ++ * ata_pio_sectors() expects buffer for each sector to not cross ++ * page boundary. Enforce it by requiring buffers to be sector ++ * aligned, which works iff sector_size is not larger than ++ * PAGE_SIZE. ATAPI devices also need the alignment as ++ * IDENTIFY_PACKET is executed as ATA_PROT_PIO. ++ */ ++ if (sdev->sector_size > PAGE_SIZE) ++ ata_dev_printk(dev, KERN_WARNING, ++ "sector_size=%u > PAGE_SIZE, PIO may malfunction\n", ++ sdev->sector_size); ++ ++ blk_queue_update_dma_alignment(sdev->request_queue, ++ sdev->sector_size - 1); ++ + if (dev->flags & ATA_DFLAG_AN) + set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); + |