linux-kernel - [PATCH RFC v3 08/22] scsi: scsi_transport

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Date:   Tue, 25 Oct 2022 18:18:02 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <damien.lemoal@...nsource.wdc.com>,
        <jejb@...ux.ibm.com>, <martin.petersen@...cle.com>,
        <jinpu.wang@...ud.ionos.com>, <hare@...e.de>, <bvanassche@....org>,
        <hch@....de>, <ming.lei@...hat.com>, <niklas.cassel@....com>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-ide@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <linuxarm@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v3 08/22] scsi: scsi_transport_sas: Alloc sdev for expander

Allocate a scsi device for an expander for sending SMP commands on the
expander sdev request queue.

Use channel=1 to not conflict with scsi target devices.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/scsi_transport_sas.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index 2f88c61216ee..da075dfc7cd0 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -1548,6 +1548,11 @@ int sas_rphy_add(struct sas_rphy *rphy)
 
 		scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun,
 				 SCSI_SCAN_INITIAL);
+	} else if (identify->device_type == SAS_EDGE_EXPANDER_DEVICE ||
+		   identify->device_type == SAS_FANOUT_EXPANDER_DEVICE) {
+
+		if (!scsi_get_dev(&rphy->dev, 1, rphy->scsi_target_id, 0))
+			return -ENODEV;
 	}
 
 	return 0;
@@ -1627,6 +1632,7 @@ sas_rphy_remove(struct sas_rphy *rphy)
 	case SAS_EDGE_EXPANDER_DEVICE:
 	case SAS_FANOUT_EXPANDER_DEVICE:
 		sas_remove_children(dev);
+		scsi_remove_target(dev);
 		break;
 	default:
 		break;
-- 
2.35.3