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| author | Alan Stern <stern@rowland.harvard.edu> | 2009-03-23 16:51:02 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-25 02:20:26 +0300 |
| commit | 5c16034d73da2c1b663aa25dedadbc533b3d811c (patch) | |
| tree | 49d0c57f87a8605ba178f0a3b916a853a3712556 /drivers/usb/storage/scsiglue.c | |
| parent | 090b90118207e786d2990310d063fda5d52cce6e (diff) | |
| download | linux-5c16034d73da2c1b663aa25dedadbc533b3d811c.tar.xz | |
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/scsiglue.c')
| -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 727c506417cc..ed710bcdaab2 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. |