linux-kernel - [PATCH 2/4] powerpc/vas: Fix cleanup when VAS is not configured

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Message-Id: <1518234567-24869-2-git-send-email-sukadev@linux.vnet.ibm.com>
Date:   Fri,  9 Feb 2018 19:49:25 -0800
From:   Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        mikey@...ling.org, hbabu@...ibm.com, linuxppc-dev@...abs.org,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/4] powerpc/vas: Fix cleanup when VAS is not configured

When VAS is not configured in the system, make sure to remove
the VAS debugfs directory and unregister the platform driver.

Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/vas-debug.c | 5 +++++
 arch/powerpc/platforms/powernv/vas.c       | 5 ++++-
 arch/powerpc/platforms/powernv/vas.h       | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/vas-debug.c b/arch/powerpc/platforms/powernv/vas-debug.c
index b4de4c6..e6e4067 100644
--- a/arch/powerpc/platforms/powernv/vas-debug.c
+++ b/arch/powerpc/platforms/powernv/vas-debug.c
@@ -207,3 +207,8 @@ void vas_init_dbgdir(void)
 	if (IS_ERR(vas_debugfs))
 		vas_debugfs = NULL;
 }
+
+void vas_cleanup_dbgdir(void)
+{
+	debugfs_remove_recursive(vas_debugfs);
+}
diff --git a/arch/powerpc/platforms/powernv/vas.c b/arch/powerpc/platforms/powernv/vas.c
index aebbe95..f83e27d8 100644
--- a/arch/powerpc/platforms/powernv/vas.c
+++ b/arch/powerpc/platforms/powernv/vas.c
@@ -169,8 +169,11 @@ static int __init vas_init(void)
 		found++;
 	}
 
-	if (!found)
+	if (!found) {
+		platform_driver_unregister(&vas_driver);
+		vas_cleanup_dbgdir();
 		return -ENODEV;
+	}
 
 	pr_devel("Found %d instances\n", found);
 
diff --git a/arch/powerpc/platforms/powernv/vas.h b/arch/powerpc/platforms/powernv/vas.h
index ae0100f..2645613 100644
--- a/arch/powerpc/platforms/powernv/vas.h
+++ b/arch/powerpc/platforms/powernv/vas.h
@@ -406,6 +406,7 @@ extern struct mutex vas_mutex;
 
 extern struct vas_instance *find_vas_instance(int vasid);
 extern void vas_init_dbgdir(void);
+extern void vas_cleanup_dbgdir(void);
 extern void vas_instance_init_dbgdir(struct vas_instance *vinst);
 extern void vas_window_init_dbgdir(struct vas_window *win);
 extern void vas_window_free_dbgdir(struct vas_window *win);
-- 
2.7.4