linux-kernel - [PATCH] mtip32xx: Fix incorrect warning

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Date:	Fri, 10 Oct 2014 02:32:16 +1030
From:	Daniel Cotton <danielcotton.mailinglists@...il.com>
To:	axboe@...com
CC:	linux-kernel@...r.kernel.org
Subject: [PATCH] mtip32xx: Fix incorrect warning

Prevent mtip32xx block driver from showing a warning at load time 
("Error creating debugfs parent") when debugfs is not included in
the kernel. If debugfs is included, show the error code. Fixes bug
55831 in the Bugzilla.

Signed-off-by: Daniel Cotton <danielcotton.patches@...il.com>
---
  drivers/block/mtip32xx/mtip32xx.c | 11 +++++++----
  1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c 
b/drivers/block/mtip32xx/mtip32xx.c
index 5c8e7fe..1124c61 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -4686,16 +4686,19 @@ static int __init mtip_init(void)
  	mtip_major = error;

  	dfs_parent = debugfs_create_dir("rssd", NULL);
-	if (IS_ERR_OR_NULL(dfs_parent)) {
-		pr_warn("Error creating debugfs parent\n");
+	if (IS_ERR_OR_NULL(dfs_parent) && PTR_ERR(dfs_parent) != -ENODEV) {
+		pr_warn("Error creating debugfs parent, error code: %ld\n",
+			PTR_ERR(dfs_parent));
  		dfs_parent = NULL;
  	}
  	if (dfs_parent) {
  		dfs_device_status = debugfs_create_file("device_status",
  					S_IRUGO, dfs_parent, NULL,
  					&mtip_device_status_fops);
-		if (IS_ERR_OR_NULL(dfs_device_status)) {
-			pr_err("Error creating device_status node\n");
+		if (IS_ERR_OR_NULL(dfs_device_status) &&
+		    PTR_ERR(dfs_device_status) != -ENODEV) {
+			pr_err("Error creating device_status node, error code: %ld\n",
+				PTR_ERR(dfs_device_status));
  			dfs_device_status = NULL;
  		}
  	}
--
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