usb-storage: add quirk for mandatory READ_CAPACITY_16

Some USB drive enclosures do not correctly report an
overflow condition if they hold a drive with a capacity
over 2TB and are confronted with a READ_CAPACITY_10.
They answer with their capacity modulo 2TB.
The generic layer cannot cope with that. It must be told
to use READ_CAPACITY_16 from the beginning.

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

diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 94d75ed..18509e6 100644 (file)
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -211,8 +211,11 @@ static int slave_configure(struct scsi_device *sdev)
                /*
                 * Many devices do not respond properly to READ_CAPACITY_16.
                 * Tell the SCSI layer to try READ_CAPACITY_10 first.
+                * However some USB 3.0 drive enclosures return capacity
+                * modulo 2TB. Those must use READ_CAPACITY_16
                 */
-               sdev->try_rc_10_first = 1;
+               if (!(us->fflags & US_FL_NEEDS_CAP16))
+                       sdev->try_rc_10_first = 1;
 
                /* assume SPC3 or latter devices support sense size > 18 */
                if (sdev->scsi_level > SCSI_SPC_2)

diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h
index c015f2c..de32cfa 100644 (file)
--- a/drivers/usb/storage/unusual_devs.h
+++ b/drivers/usb/storage/unusual_devs.h
@@ -1925,6 +1925,13 @@ UNUSUAL_DEV(  0x1652, 0x6600, 0x0201, 0x0201,
                USB_SC_DEVICE, USB_PR_DEVICE, NULL,
                US_FL_IGNORE_RESIDUE ),
 
+/* Reported by Oliver Neukum <oneukum@suse.com> */
+UNUSUAL_DEV(  0x174c, 0x55aa, 0x0100, 0x0100,
+               "ASMedia",
+               "AS2105",
+               USB_SC_DEVICE, USB_PR_DEVICE, NULL,
+               US_FL_NEEDS_CAP16),
+
 /* Reported by Jesse Feddema <jdfeddema@gmail.com> */
 UNUSUAL_DEV(  0x177f, 0x0400, 0x0000, 0x0000,
                "Yarvik",

diff --git a/include/linux/usb_usual.h b/include/linux/usb_usual.h
index bf99cd0..6303568 100644 (file)
--- a/include/linux/usb_usual.h
+++ b/include/linux/usb_usual.h
@@ -66,7 +66,9 @@
        US_FLAG(INITIAL_READ10, 0x00100000)                     \
                /* Initial READ(10) (and others) must be retried */     \
        US_FLAG(WRITE_CACHE,    0x00200000)                     \
-               /* Write Cache status is not available */
+               /* Write Cache status is not available */       \
+       US_FLAG(NEEDS_CAP16,    0x00400000)
+               /* cannot handle READ_CAPACITY_10 */
 
 #define US_FLAG(name, value)   US_FL_##name = value ,
 enum { US_DO_ALL_FLAGS };