From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> This patch (as1203) increases the max_sector limit for USB tape drives. By default usb-storage sets max_sectors to 240 (i.e., 120 KB) for all devices. But tape drives need a higher limit, since tapes can and do have very large block sizes. Without the ability to transfer an entire large block in a single command, such tapes can't be used. This fixes Bugzilla #12207. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Reported-and-tested-by: Phil Mitchell <philipm@xxxxxxxxxx> Cc: stable <stable@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx> --- drivers/usb/storage/scsiglue.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 727c506..ed710bc 100644 --- a/drivers/usb/storage/scsiglue.c +++ b/drivers/usb/storage/scsiglue.c @@ -135,6 +135,12 @@ static int slave_configure(struct scsi_device *sdev) if (sdev->request_queue->max_sectors > max_sectors) blk_queue_max_sectors(sdev->request_queue, max_sectors); + } else if (sdev->type == TYPE_TAPE) { + /* Tapes need much higher max_sector limits, so just + * raise it to the maximum possible (4 GB / 512) and + * let the queue segment size sort out the real limit. + */ + blk_queue_max_sectors(sdev->request_queue, 0x7FFFFF); } /* Some USB host controllers can't do DMA; they have to use PIO. -- 1.6.2 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html