1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/s390/scsi/zfcp_diag.c b/drivers/s390/scsi/zfcp_diag.c
index d7d2db85b32e..8df3ace6135d 100644
--- a/drivers/s390/scsi/zfcp_diag.c
+++ b/drivers/s390/scsi/zfcp_diag.c
@@ -10,6 +10,8 @@
 #include <linux/spinlock.h>
 #include <linux/jiffies.h>
 #include <linux/string.h>
+#include <linux/kernfs.h>
+#include <linux/sysfs.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
 
@@ -78,6 +80,46 @@ void zfcp_diag_adapter_free(struct zfcp_adapter *const adapter)
 }
 
 /**
+ * zfcp_diag_sysfs_setup() - Setup the sysfs-group for adapter-diagnostics.
+ * @adapter: target adapter to which the group should be added.
+ *
+ * Return: 0 on success; Something else otherwise (see sysfs_create_group()).
+ */
+int zfcp_diag_sysfs_setup(struct zfcp_adapter *const adapter)
+{
+	int rc = sysfs_create_group(&adapter->ccw_device->dev.kobj,
+				    &zfcp_sysfs_diag_attr_group);
+	if (rc == 0)
+		adapter->diagnostics->sysfs_established = 1;
+
+	return rc;
+}
+
+/**
+ * zfcp_diag_sysfs_destroy() - Remove the sysfs-group for adapter-diagnostics.
+ * @adapter: target adapter from which the group should be removed.
+ */
+void zfcp_diag_sysfs_destroy(struct zfcp_adapter *const adapter)
+{
+	if (adapter->diagnostics == NULL ||
+	    !adapter->diagnostics->sysfs_established)
+		return;
+
+	/*
+	 * We need this state-handling so we can prevent warnings being printed
+	 * on the kernel-console in case we have to abort a halfway done
+	 * zfcp_adapter_enqueue(), in which the sysfs-group was not yet
+	 * established. sysfs_remove_group() does this checking as well, but
+	 * still prints a warning in case we try to remove a group that has not
+	 * been established before
+	 */
+	adapter->diagnostics->sysfs_established = 0;
+	sysfs_remove_group(&adapter->ccw_device->dev.kobj,
+			   &zfcp_sysfs_diag_attr_group);
+}
+
+
+/**
  * zfcp_diag_update_xdata() - Update a diagnostics buffer.
  * @hdr: the meta data to update.
  * @data: data to use for the update.