1 files changed, 32 insertions, 20 deletions

diff --git a/kernel/printk.c b/kernel/printk.c
index 2d607f4d1797..19c0d7bcf24a 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -87,6 +87,12 @@ static DEFINE_SEMAPHORE(console_sem);
 struct console *console_drivers;
 EXPORT_SYMBOL_GPL(console_drivers);
 
+#ifdef CONFIG_LOCKDEP
+static struct lockdep_map console_lock_dep_map = {
+        .name = "console_lock"
+};
+#endif
+
 /*
  * This is used for debugging the mess that is the VT code by
  * keeping track if we have the console semaphore held. It's
@@ -741,6 +747,21 @@ void __init setup_log_buf(int early)
                 free, (free * 100) / __LOG_BUF_LEN);
 }
 
+static bool __read_mostly ignore_loglevel;
+
+static int __init ignore_loglevel_setup(char *str)
+{
+        ignore_loglevel = 1;
+        printk(KERN_INFO "debug: ignoring loglevel setting.\n");
+
+        return 0;
+}
+
+early_param("ignore_loglevel", ignore_loglevel_setup);
+module_param(ignore_loglevel, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
+        "print all kernel messages to the console.");
+
 #ifdef CONFIG_BOOT_PRINTK_DELAY
 
 static int boot_delay; /* msecs delay after each printk during bootup */
@@ -764,13 +785,15 @@ static int __init boot_delay_setup(char *str)
 }
 __setup("boot_delay=", boot_delay_setup);
 
-static void boot_delay_msec(void)
+static void boot_delay_msec(int level)
 {
         unsigned long long k;
         unsigned long timeout;
 
-        if (boot_delay == 0 || system_state != SYSTEM_BOOTING)
+        if ((boot_delay == 0 || system_state != SYSTEM_BOOTING)
+                || (level >= console_loglevel && !ignore_loglevel)) {
                 return;
+        }
 
         k = (unsigned long long)loops_per_msec * boot_delay;
 
@@ -789,7 +812,7 @@ static void boot_delay_msec(void)
         }
 }
 #else
-static inline void boot_delay_msec(void)
+static inline void boot_delay_msec(int level)
 {
 }
 #endif
@@ -1232,21 +1255,6 @@ SYSCALL_DEFINE3(syslog, int, type, char __user *, buf, int, len)
         return do_syslog(type, buf, len, SYSLOG_FROM_CALL);
 }
 
-static bool __read_mostly ignore_loglevel;
-
-static int __init ignore_loglevel_setup(char *str)
-{
-        ignore_loglevel = 1;
-        printk(KERN_INFO "debug: ignoring loglevel setting.\n");
-
-        return 0;
-}
-
-early_param("ignore_loglevel", ignore_loglevel_setup);
-module_param(ignore_loglevel, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(ignore_loglevel, "ignore loglevel setting, to"
-        "print all kernel messages to the console.");
-
 /*
  * Call the console drivers, asking them to write out
  * log_buf[start] to log_buf[end - 1].
@@ -1492,7 +1500,7 @@ asmlinkage int vprintk_emit(int facility, int level,
         int this_cpu;
         int printed_len = 0;
 
-        boot_delay_msec();
+        boot_delay_msec(level);
         printk_delay();
 
         /* This stops the holder of console_sem just where we want him */
@@ -1908,12 +1916,14 @@ static int __cpuinit console_cpu_notify(struct notifier_block *self,
  */
 void console_lock(void)
 {
-        BUG_ON(in_interrupt());
+        might_sleep();
+
         down(&console_sem);
         if (console_suspended)
                 return;
         console_locked = 1;
         console_may_schedule = 1;
+        mutex_acquire(&console_lock_dep_map, 0, 0, _RET_IP_);
 }
 EXPORT_SYMBOL(console_lock);
 
@@ -1935,6 +1945,7 @@ int console_trylock(void)
         }
         console_locked = 1;
         console_may_schedule = 0;
+        mutex_acquire(&console_lock_dep_map, 0, 1, _RET_IP_);
         return 1;
 }
 EXPORT_SYMBOL(console_trylock);
@@ -2095,6 +2106,7 @@ skip:
                 local_irq_restore(flags);
         }
         console_locked = 0;
+        mutex_release(&console_lock_dep_map, 1, _RET_IP_);
 
         /* Release the exclusive_console once it is used */
         if (unlikely(exclusive_console))