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| author | Alan Stern <stern@rowland.harvard.edu> | 2009-03-26 18:25:09 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-05-02 10:23:27 -0700 |
| commit | 9603c9411f59fa9925361f28743fd9e44be6ad6f (patch) | |
| tree | 2d828610780a9c3285feac9e5bd3b4fa23adeb17 /drivers | |
| parent | f4c96e1552f2459347f02afbfd3e2f1daf977e06 (diff) | |
| download | lwn-9603c9411f59fa9925361f28743fd9e44be6ad6f.tar.gz lwn-9603c9411f59fa9925361f28743fd9e44be6ad6f.zip | |
USB: usb-storage: increase max_sectors for tape drives
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | 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 8daaacedfa61..5f484ae77d55 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); } /* We can't put these settings in slave_alloc() because that gets |