linux-kernel - [PATCH 12/26] dynamic_debug: dont kill entire facility on error parsing ddebug

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Message-Id: <1316642115-20029-13-git-send-email-jim.cromie@gmail.com>
Date:	Wed, 21 Sep 2011 15:55:01 -0600
From:	jim.cromie@...il.com
To:	jbaron@...hat.com
Cc:	joe@...ches.com, bart.vanassche@...il.com, greg@...ah.com,
	linux-kernel@...r.kernel.org, Jim Cromie <jim.cromie@...il.com>
Subject: [PATCH 12/26] dynamic_debug: dont kill entire facility on error parsing ddebug_query

From: Jim Cromie <jim.cromie@...il.com>

Currently, a parsing error on ddebug_query results in effective loss
of the facility; all tables are removed, and the init-call returns error.
This is way too severe, especially when an innocent quoting error can
be the cause:

Kernel command line: ... ddebug_query='file char_dev.c +p'
yields:

ddebug_exec_queries: query 0: "'file"
query before parse <'file>
ddebug_exec_queries: processed 1 queries, with 1 errs
Invalid ddebug boot param 'file

Fix this by zeroing return-code for query parse errors before
returning from dynamic_debug_init().

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 0676de0..3f37b5e 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -922,12 +922,10 @@ static int __init dynamic_debug_init(void)
 		pr_info("ddebug initializing with string \"%s\"",
 			ddebug_setup_string);
 		ret = ddebug_exec_queries(ddebug_setup_string);
-		if (ret)
-			pr_warn("Invalid ddebug boot param %s",
-				ddebug_setup_string);
-		else
-			pr_info("ddebug initialized with string %s",
-				ddebug_setup_string);
+		if (ret) {
+			ret = 0; /* make this non-fatal */
+			pr_warn("invalid ddebug_query\n");
+		}
 	}
 
 out_free:
-- 
1.7.4.4

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