[PATCH v2 44/71] ata: Don't try to use non-existent ports

[Simon Glass]

The controller indicates the number of ports but also has a port map
which specifies which ports are actually valid. Make use of this to
avoid trying to send commands to an invalid port.

This avoids a crash on some controllers.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v1)

 drivers/ata/ahci.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index de6131f1d9b..272c48b8e57 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -675,6 +675,12 @@ static int ata_scsiop_inquiry(struct ahci_uc_priv *uc_priv,
 	/* Read id from sata */
 	port = pccb->target;
 
+	/* If this port number is not valid, give up */
+	if (!(uc_priv->port_map & (1 << port))) {
+		debug("Port %x not valid in map %x\n", port, uc_priv->port_map);
+		return -ENODEV;
+	}
+
 	if (ahci_device_data_io(uc_priv, port, (u8 *)&fis, sizeof(fis),
 				(u8 *)tmpid, ATA_ID_WORDS * 2, 0)) {
 		debug("scsi_ahci: SCSI inquiry command failure.\n");
-- 
2.39.0.314.g84b9a713c41-goog