Fix cleanup when VAS is not configured

Message ID 20180213195327.GA10678@us.ibm.com
State New
Headers show
Series
  • Fix cleanup when VAS is not configured
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Commit Message

Sukadev Bhattiprolu Feb. 13, 2018, 7:53 p.m.
From: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Date: Fri, 9 Feb 2018 11:49:06 -0600
Subject: [PATCH 1/1] powerpc/vas: Fix cleanup when VAS is not configured

When VAS is not configured, unregister the platform driver. Also simplify
cleanup by delaying vas debugfs init until we know VAS is configured.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
---
Changelog[v2]
	- [Michael Ellerman] Move vas_init_dbgdir() into a lower level
	  function to keep vas_init() cleaner.
---
 arch/powerpc/platforms/powernv/vas-debug.c | 11 +++++++++++
 arch/powerpc/platforms/powernv/vas.c       |  6 +++---
 2 files changed, 14 insertions(+), 3 deletions(-)

Patch

diff --git a/arch/powerpc/platforms/powernv/vas-debug.c b/arch/powerpc/platforms/powernv/vas-debug.c
index b4de4c6..4f7276e 100644
--- a/arch/powerpc/platforms/powernv/vas-debug.c
+++ b/arch/powerpc/platforms/powernv/vas-debug.c
@@ -179,6 +179,7 @@  void vas_instance_init_dbgdir(struct vas_instance *vinst)
 {
 	struct dentry *d;
 
+	vas_init_dbgdir();
 	if (!vas_debugfs)
 		return;
 
@@ -201,8 +202,18 @@  void vas_instance_init_dbgdir(struct vas_instance *vinst)
 	vinst->dbgdir = NULL;
 }
 
+/*
+ * Set up the "root" VAS debugfs dir. Return if we already set it up
+ * (or failed to) in an earlier instance of VAS.
+ */
 void vas_init_dbgdir(void)
 {
+	static bool first_time = true;
+
+	if (!first_time)
+		return;
+
+	first_time = false;
 	vas_debugfs = debugfs_create_dir("vas", NULL);
 	if (IS_ERR(vas_debugfs))
 		vas_debugfs = NULL;
diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
index aebbe95..5a2b24c 100644
--- a/arch/powerpc/platforms/powernv/vas.c
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -160,8 +160,6 @@  static int __init vas_init(void)
 	int found = 0;
 	struct device_node *dn;
 
-	vas_init_dbgdir();
-
 	platform_driver_register(&vas_driver);
 
 	for_each_compatible_node(dn, NULL, "ibm,vas") {
@@ -169,8 +167,10 @@  static int __init vas_init(void)
 		found++;
 	}
 
-	if (!found)
+	if (!found) {
+		platform_driver_unregister(&vas_driver);
 		return -ENODEV;
+	}
 
 	pr_devel("Found %d instances\n", found);