---

yaml
---
r: 213627
b: refs/heads/master
c: 5ce524b
h: refs/heads/master
i:
  213625: 044d24e
  213623: 4f9dc1a
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: ae38c78a03e1b77ad45248fcf097e4568e740209
+refs/heads/master: 5ce524bdff367b4abda20bcfd4dafd9d30c773df

trunk/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 "

trunk/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 */