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authorAlan Stern <stern@rowland.harvard.edu>2009-03-23 09:51:02 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-03-24 16:20:26 -0700
commit5c16034d73da2c1b663aa25dedadbc533b3d811c (patch)
tree49d0c57f87a8605ba178f0a3b916a853a3712556 /drivers/usb/storage
parent090b90118207e786d2990310d063fda5d52cce6e (diff)
USB: usb-storage: increase max_sectors for tape drives
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>
Diffstat (limited to 'drivers/usb/storage')
-rw-r--r--drivers/usb/storage/scsiglue.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 727c506417c..ed710bcdaab 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.