forked from luck/tmp_suning_uos_patched
libata: set queue DMA alignment to sector size for ATAPI too
ata_pio_sectors() expects buffer for each sector to be contained in a single page; otherwise, it ends up overrunning the first page. This is achieved by setting queue DMA alignment. If sector_size is smaller than PAGE_SIZE and all buffers are sector_size aligned, buffer for each sector is always contained in a single page. This wasn't applied to ATAPI devices but IDENTIFY_PACKET is executed as ATA_PROT_PIO and thus uses ata_pio_sectors(). Newer versions of udev issue IDENTIFY_PACKET with unaligned buffer triggering the problem and causing oops. This patch fixes the problem by setting sdev->sector_size to ATA_SECT_SIZE on ATATPI devices and always setting DMA alignment to sector_size. While at it, add a warning for the unlikely but still possible scenario where sector_size is larger than PAGE_SIZE, in which case the alignment wouldn't be enough. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: John Stanley <jpsinthemix@verizon.net> Tested-by: John Stanley <jpsinthemix@verizon.net> Cc: stable@kernel.org Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -1099,9 +1099,9 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
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struct request_queue *q = sdev->request_queue;
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void *buf;
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/* set the min alignment and padding */
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blk_queue_update_dma_alignment(sdev->request_queue,
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ATA_DMA_PAD_SZ - 1);
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sdev->sector_size = ATA_SECT_SIZE;
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/* set DMA padding */
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blk_queue_update_dma_pad(sdev->request_queue,
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ATA_DMA_PAD_SZ - 1);
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@ -1115,13 +1115,25 @@ static int ata_scsi_dev_config(struct scsi_device *sdev,
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blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
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} else {
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/* ATA devices must be sector aligned */
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sdev->sector_size = ata_id_logical_sector_size(dev->id);
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blk_queue_update_dma_alignment(sdev->request_queue,
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sdev->sector_size - 1);
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sdev->manage_start_stop = 1;
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}
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/*
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* ata_pio_sectors() expects buffer for each sector to not cross
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* page boundary. Enforce it by requiring buffers to be sector
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* aligned, which works iff sector_size is not larger than
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* PAGE_SIZE. ATAPI devices also need the alignment as
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* IDENTIFY_PACKET is executed as ATA_PROT_PIO.
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*/
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if (sdev->sector_size > PAGE_SIZE)
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ata_dev_printk(dev, KERN_WARNING,
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"sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
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sdev->sector_size);
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blk_queue_update_dma_alignment(sdev->request_queue,
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sdev->sector_size - 1);
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if (dev->flags & ATA_DFLAG_AN)
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set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
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