lkml.org 
[lkml]   [2009]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[patch 10/45] USB: usb-storage: increase max_sectors for tape drives
    -stable review patch.  If anyone has any objections, please let us know.
    ---------------------

    From: Alan Stern <stern@rowland.harvard.edu>

    upstream commit: 5c16034d73da2c1b663aa25dedadbc533b3d811c

    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@rowland.harvard.edu>
    Reported-and-tested-by: Phil Mitchell <philipm@sybase.com>
    Cc: stable <stable@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    Signed-off-by: Chris Wright <chrisw@sous-sol.org>
    ---
    drivers/usb/storage/scsiglue.c | 6 ++++++
    1 file changed, 6 insertions(+)

    --- a/drivers/usb/storage/scsiglue.c
    +++ b/drivers/usb/storage/scsiglue.c
    @@ -135,6 +135,12 @@ static int slave_configure(struct scsi_d
    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.


    \
     
     \ /
      Last update: 2009-04-01 01:33    [W:0.026 / U:61.868 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site