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[SCSI] Add a report opcode helper

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The REPORT SUPPORTED OPERATION CODES command can be used to query
whether a given opcode is supported by a device. Add a helper function
that allows us to look up commands.

We only issue RSOC if the device reports compliance with SPC-3 or
later. But to err on the side of caution we disable the command for ATA,
FireWire and USB.

Signed-off-by: Martin K. Petersen <[email protected]>
Acked-by: Mike Snitzer <[email protected]>
Signed-off-by: James Bottomley <[email protected]>
This commit is contained in:
Martin K. Petersen 2012-09-18 12:19:30 -04:00 • committed by James Bottomley
commit 3c6bdaeab4
5 changed files with 53 additions and 0 deletions
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3
drivers/usb/storage/scsiglue.c
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@ -186,6 +186,9 @@ static int slave_configure(struct scsi_device *sdev)
/* Some devices don't handle VPD pages correctly */
sdev->skip_vpd_pages = 1;
/* Do not attempt to use REPORT SUPPORTED OPERATION CODES */
sdev->no_report_opcodes = 1;
/* Some disks return the total number of blocks in response
* to READ CAPACITY rather than the highest block number.
* If this device makes that mistake, tell the sd driver. */