usb: uas: add support for more quirk flags

The hope that UAS devices would be less broken than old style storage
devices has turned out to be unfounded. Make UAS support more of the
quirk flags of the old driver.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/storage/uas.c b/drivers/usb/storage/uas.c
index 9e9de5452860d39c2a6da87546459a38086b21b9..1f7b401c4d041d44390f3fa519dd95b46aab1b42 100644 (file)
--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -842,6 +842,27 @@ static int uas_slave_configure(struct scsi_device *sdev)
                sdev->skip_ms_page_8 = 1;
                sdev->wce_default_on = 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.
+        */
+       if (devinfo->flags & US_FL_FIX_CAPACITY)
+               sdev->fix_capacity = 1;
+
+       /*
+        * Some devices don't like MODE SENSE with page=0x3f,
+        * which is the command used for checking if a device
+        * is write-protected.  Now that we tell the sd driver
+        * to do a 192-byte transfer with this command the
+        * majority of devices work fine, but a few still can't
+        * handle it.  The sd driver will simply assume those
+        * devices are write-enabled.
+        */
+       if (devinfo->flags & US_FL_NO_WP_DETECT)
+               sdev->skip_ms_page_3f = 1;
+
        scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
        return 0;
 }