scsi: sd: Use READ(16) when reading block zero on large capacity disks

Commit 321da3dc1f3c ("scsi: sd: usb_storage: uas: Access media prior
to querying device properties") triggered a read to LBA 0 before
attempting to inquire about device characteristics. This was done
because some protocol bridge devices will return generic values until
an attached storage device's media has been accessed.

Pierre Tomon reported that this change caused problems on a large
capacity external drive connected via a bridge device. The bridge in
question does not appear to implement the READ(10) command.

Issue a READ(16) instead of READ(10) when a device has been identified
as preferring 16-byte commands (use_16_for_rw heuristic).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=218890
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]
Fixes: 321da3dc1f3c ("scsi: sd: usb_storage: uas: Access media prior to querying device properties")
Cc: [email protected]
Reported-by: Pierre Tomon <[email protected]>
Suggested-by: Alan Stern <[email protected]>
Tested-by: Pierre Tomon <[email protected]>
Reviewed-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 332eb9dac22d..fbc11046bbf6 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -3565,16 +3565,23 @@ static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
 
 static void sd_read_block_zero(struct scsi_disk *sdkp)
 {
-	unsigned int buf_len = sdkp->device->sector_size;
-	char *buffer, cmd[10] = { };
+	struct scsi_device *sdev = sdkp->device;
+	unsigned int buf_len = sdev->sector_size;
+	u8 *buffer, cmd[16] = { };
 
 	buffer = kmalloc(buf_len, GFP_KERNEL);
 	if (!buffer)
 		return;
 
-	cmd[0] = READ_10;
-	put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
-	put_unaligned_be16(1, &cmd[7]);	/* Transfer 1 logical block */
+	if (sdev->use_16_for_rw) {
+		cmd[0] = READ_16;
+		put_unaligned_be64(0, &cmd[2]); /* Logical block address 0 */
+		put_unaligned_be32(1, &cmd[10]);/* Transfer 1 logical block */
+	} else {
+		cmd[0] = READ_10;
+		put_unaligned_be32(0, &cmd[2]); /* Logical block address 0 */
+		put_unaligned_be16(1, &cmd[7]);	/* Transfer 1 logical block */
+	}
 
 	scsi_execute_cmd(sdkp->device, cmd, REQ_OP_DRV_IN, buffer, buf_len,
 			 SD_TIMEOUT, sdkp->max_retries, NULL);