2 files changed, 19 insertions, 1 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 20295774bf7..57d1e3e1bd4 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->physical_block_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/drivers/scsi/sr.c b/drivers/scsi/sr.c
index e148341079b..d7b383c96d5 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -862,10 +862,16 @@ static void get_capabilities(struct scsi_cd *cd)
 static int sr_packet(struct cdrom_device_info *cdi,
                 struct packet_command *cgc)
 {
+        struct scsi_cd *cd = cdi->handle;
+        struct scsi_device *sdev = cd->device;
+
+        if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info)
+                return -EDRIVE_CANT_DO_THIS;
+
         if (cgc->timeout <= 0)
                 cgc->timeout = IOCTL_TIMEOUT;
 
-        sr_do_ioctl(cdi->handle, cgc);
+        sr_do_ioctl(cd, cgc);
 
         return cgc->stat;
 }