diff options
| -rw-r--r-- | drivers/scsi/sd.c | 12 | ||||
| -rw-r--r-- | include/scsi/scsi_device.h | 1 |
2 files changed, 13 insertions, 0 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index ffa0689ee840..ff4c9a3aa5b2 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1498,6 +1498,9 @@ static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp, unsigned long long lba; unsigned sector_size; + if (sdp->no_read_capacity_16) + return -EINVAL; + do { memset(cmd, 0, 16); cmd[0] = SERVICE_ACTION_IN; @@ -1626,6 +1629,15 @@ static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp, sector_size = get_unaligned_be32(&buffer[4]); lba = get_unaligned_be32(&buffer[0]); + if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) { + /* Some buggy (usb cardreader) devices return an lba of + 0xffffffff when the want to report a size of 0 (with + which they really mean no media is present) */ + sdkp->capacity = 0; + sdkp->hw_sector_size = sector_size; + return sector_size; + } + if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) { sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a " "kernel compiled with support for large block " diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index e8c2433ad8a8..85867dcde335 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -149,6 +149,7 @@ struct scsi_device { unsigned last_sector_bug:1; /* do not use multisector accesses on SD_LAST_BUGGY_SECTORS */ unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */ + unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */ unsigned is_visible:1; /* is the device visible in sysfs */ DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ |