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mtip32xx: fix user_buffer check in exec_drive_command

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Current user_buffer check is incorrect and causes hdparm to fail

# hdparm -I /dev/rssda
 HDIO_DRIVE_CMD(identify) failed: Input/output error

/dev/rssda:

Patching linux-3.6-rc5 hdparm works as expected

# hdparm -I /dev/rssda
/dev/rssda:

ATA device, with non-removable media
	Model Number:       DELL_P320h-MTFDGAL350SAH
	Serial Number:      00000000121302025F01
	Firmware Revision:  B1442808
<snip>

Reported-by: Tomas Henzl <[email protected]>
Signed-off-by: David Milburn <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
David Milburn 2012-09-12 14:06:12 -05:00 • committed by Jens Axboe
commit 97651ea687
1 changed files with 1 additions and 1 deletions
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2
drivers/block/mtip32xx/mtip32xx.c
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@ -1904,7 +1904,7 @@ static int exec_drive_command(struct mtip_port *port, u8 *command,
int rv = 0, xfer_sz = command[3];
if (xfer_sz) {
if (user_buffer)
if (!user_buffer)
return -EFAULT;
buf = dmam_alloc_coherent(&port->dd->pdev->dev,