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authorOliver Neukum <oneukum@suse.de>2007-02-08 09:04:48 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-16 15:32:19 -0800
commit61bf54b71d5abf767ee46284be19965d7253ddbf (patch)
tree04bda12e495bc19be2712dff9da35f5e3271691a /drivers/usb
parent5b06470816fb5e658e81db2a55b530ff2ba711c9 (diff)
USB Storage: indistinguishable devices with broken and unbroken firmware
there's a USB mass storage device which exists in two version. One reports the correct size and the other does not. Apart from that they are identical and cannot be told apart. Here's a heuristic based on the empirical finding that drives have even sizes. Signed-off-by: Oliver Neukum <oneukum@suse.de> Acked-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Matthew Dharm <mdharm-usb@one-eyed-alien.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/storage/scsiglue.c6
-rw-r--r--drivers/usb/storage/unusual_devs.h2
2 files changed, 7 insertions, 1 deletions
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 70234f5dbeeb..e227f64d5641 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -153,6 +153,12 @@ static int slave_configure(struct scsi_device *sdev)
if (us->flags & US_FL_FIX_CAPACITY)
sdev->fix_capacity = 1;
+ /* A few disks have two indistinguishable version, one of
+ * which reports the correct capacity and the other does not.
+ * The sd driver has to guess which is the case. */
+ if (us->flags & US_FL_CAPACITY_HEURISTICS)
+ sdev->guess_capacity = 1;
+
/* Some devices report a SCSI revision level above 2 but are
* unable to handle the REPORT LUNS command (for which
* support is mandatory at level 3). Since we already have
diff --git a/drivers/usb/storage/unusual_devs.h b/drivers/usb/storage/unusual_devs.h
index bab054b8d94f..568366569769 100644
--- a/drivers/usb/storage/unusual_devs.h
+++ b/drivers/usb/storage/unusual_devs.h
@@ -1434,7 +1434,7 @@ UNUSUAL_DEV( 0xed06, 0x4500, 0x0001, 0x0001,
"DataStor",
"USB4500 FW1.04",
US_SC_DEVICE, US_PR_DEVICE, NULL,
- US_FL_FIX_CAPACITY),
+ US_FL_CAPACITY_HEURISTICS),
/* Control/Bulk transport for all SubClass values */
USUAL_DEV(US_SC_RBC, US_PR_CB, USB_US_TYPE_STOR),