printk: only look for prefix levels in kernel messages

vprintk_emit() prefix parsing should only be done for internal kernel
messages.  This allows existing behavior to be kept in all cases.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/printk.c b/kernel/printk.c
index 0d882a2..6a76ab9 100644 (file)
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -1487,7 +1487,6 @@ asmlinkage int vprintk_emit(int facility, int level,
        size_t text_len;
        enum log_flags lflags = 0;
        unsigned long flags;
-       int kern_level;
        int this_cpu;
        int printed_len = 0;
 
@@ -1543,21 +1542,24 @@ asmlinkage int vprintk_emit(int facility, int level,
                lflags |= LOG_NEWLINE;
        }
 
-       /* strip syslog prefix and extract log level or control flags */
-       kern_level = printk_get_level(text);
-       if (kern_level) {
-               const char *end_of_header = printk_skip_level(text);
-               switch (kern_level) {
-               case '0' ... '7':
-                       if (level == -1)
-                               level = kern_level - '0';
-               case 'd':       /* KERN_DEFAULT */
-                       lflags |= LOG_PREFIX;
-               case 'c':       /* KERN_CONT */
-                       break;
+       /* strip kernel syslog prefix and extract log level or control flags */
+       if (facility == 0) {
+               int kern_level = printk_get_level(text);
+
+               if (kern_level) {
+                       const char *end_of_header = printk_skip_level(text);
+                       switch (kern_level) {
+                       case '0' ... '7':
+                               if (level == -1)
+                                       level = kern_level - '0';
+                       case 'd':       /* KERN_DEFAULT */
+                               lflags |= LOG_PREFIX;
+                       case 'c':       /* KERN_CONT */
+                               break;
+                       }
+                       text_len -= end_of_header - text;
+                       text = (char *)end_of_header;
                }
-               text_len -= end_of_header - text;
-               text = (char *)end_of_header;
        }
 
        if (level == -1)