linux-kernel - [PATCH 4.9 08/32] ata: Fix ZBC

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Date:   Mon, 16 Jul 2018 09:36:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        David Butterfield <david.butterfield@....com>,
        Damien Le Moal <damien.lemoal@....com>,
        Tejun Heo <tj@...nel.org>
Subject: [PATCH 4.9 08/32] ata: Fix ZBC_OUT all bit handling

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Damien Le Moal <damien.lemoal@....com>

commit 6edf1d4cb0acde3a0a5dac849f33031bd7abb7b1 upstream.

If the ALL bit is set in the ZBC_OUT command, the command zone ID field
(block) should be ignored.

Reported-by: David Butterfield <david.butterfield@....com>
Signed-off-by: Damien Le Moal <damien.lemoal@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/ata/libata-scsi.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3772,7 +3772,14 @@ static unsigned int ata_scsi_zbc_out_xla
 		 */
 		goto invalid_param_len;
 	}
-	if (block >= dev->n_sectors) {
+
+	all = cdb[14] & 0x1;
+	if (all) {
+		/*
+		 * Ignore the block address (zone ID) as defined by ZBC.
+		 */
+		block = 0;
+	} else if (block >= dev->n_sectors) {
 		/*
 		 * Block must be a valid zone ID (a zone start LBA).
 		 */
@@ -3780,8 +3787,6 @@ static unsigned int ata_scsi_zbc_out_xla
 		goto invalid_fld;
 	}
 
-	all = cdb[14] & 0x1;
-
 	if (ata_ncq_enabled(qc->dev) &&
 	    ata_fpdma_zac_mgmt_out_supported(qc->dev)) {
 		tf->protocol = ATA_PROT_NCQ_NODATA;