diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/sd.c | 11 | ||||
| -rw-r--r-- | drivers/usb/storage/scsiglue.c | 6 | ||||
| -rw-r--r-- | drivers/usb/storage/unusual_devs.h | 2 |
3 files changed, 17 insertions, 2 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3f048bd6326d..5a8f55fea5ff 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1269,9 +1269,18 @@ repeat: /* Some devices return the total number of sectors, not the * highest sector number. Make the necessary adjustment. */ - if (sdp->fix_capacity) + if (sdp->fix_capacity) { --sdkp->capacity; + /* Some devices have version which report the correct sizes + * and others which do not. We guess size according to a heuristic + * and err on the side of lowering the capacity. */ + } else { + if (sdp->guess_capacity) + if (sdkp->capacity & 0x01) /* odd sizes are odd */ + --sdkp->capacity; + } + got_data: if (sector_size == 0) { sector_size = 512; 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), |
