1 files changed, 23 insertions, 7 deletions

diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 9285cdb734b2..fc5d86222bc3 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -104,14 +104,11 @@ static ssize_t target_type_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(target_type);
 
-static ssize_t target_list_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
+static ssize_t emit_target_list(struct cxl_decoder *cxld, char *buf)
 {
-	struct cxl_decoder *cxld = to_cxl_decoder(dev);
 	ssize_t offset = 0;
 	int i, rc = 0;
 
-	cxl_device_lock(dev);
 	for (i = 0; i < cxld->interleave_ways; i++) {
 		struct cxl_dport *dport = cxld->target[i];
 		struct cxl_dport *next = NULL;
@@ -124,13 +121,29 @@ static ssize_t target_list_show(struct device *dev,
 		rc = sysfs_emit_at(buf, offset, "%d%s", dport->port_id,
 				   next ? "," : "");
 		if (rc < 0)
-			break;
+			return rc;
 		offset += rc;
 	}
-	cxl_device_unlock(dev);
+
+	return offset;
+}
+
+static ssize_t target_list_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct cxl_decoder *cxld = to_cxl_decoder(dev);
+	ssize_t offset;
+	unsigned int seq;
+	int rc;
+
+	do {
+		seq = read_seqbegin(&cxld->target_lock);
+		rc = emit_target_list(cxld, buf);
+	} while (read_seqretry(&cxld->target_lock, seq));
 
 	if (rc < 0)
 		return rc;
+	offset = rc;
 
 	rc = sysfs_emit_at(buf, offset, "\n");
 	if (rc < 0)
@@ -494,15 +507,17 @@ static int decoder_populate_targets(struct cxl_decoder *cxld,
 		goto out_unlock;
 	}
 
+	write_seqlock(&cxld->target_lock);
 	for (i = 0; i < cxld->nr_targets; i++) {
 		struct cxl_dport *dport = find_dport(port, target_map[i]);
 
 		if (!dport) {
 			rc = -ENXIO;
-			goto out_unlock;
+			break;
 		}
 		cxld->target[i] = dport;
 	}
+	write_sequnlock(&cxld->target_lock);
 
 out_unlock:
 	cxl_device_unlock(&port->dev);
@@ -543,6 +558,7 @@ static struct cxl_decoder *cxl_decoder_alloc(struct cxl_port *port,
 
 	cxld->id = rc;
 	cxld->nr_targets = nr_targets;
+	seqlock_init(&cxld->target_lock);
 	dev = &cxld->dev;
 	device_initialize(dev);
 	device_set_pm_not_required(dev);