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-rw-r--r--kernel/printk.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/kernel/printk.c b/kernel/printk.c
index 69188f226a93..e3602d0755b0 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -73,7 +73,6 @@ EXPORT_SYMBOL(oops_in_progress);
73 * driver system. 73 * driver system.
74 */ 74 */
75static DECLARE_MUTEX(console_sem); 75static DECLARE_MUTEX(console_sem);
76static DECLARE_MUTEX(secondary_console_sem);
77struct console *console_drivers; 76struct console *console_drivers;
78EXPORT_SYMBOL_GPL(console_drivers); 77EXPORT_SYMBOL_GPL(console_drivers);
79 78
@@ -891,12 +890,14 @@ void suspend_console(void)
891 printk("Suspending console(s) (use no_console_suspend to debug)\n"); 890 printk("Suspending console(s) (use no_console_suspend to debug)\n");
892 acquire_console_sem(); 891 acquire_console_sem();
893 console_suspended = 1; 892 console_suspended = 1;
893 up(&console_sem);
894} 894}
895 895
896void resume_console(void) 896void resume_console(void)
897{ 897{
898 if (!console_suspend_enabled) 898 if (!console_suspend_enabled)
899 return; 899 return;
900 down(&console_sem);
900 console_suspended = 0; 901 console_suspended = 0;
901 release_console_sem(); 902 release_console_sem();
902} 903}
@@ -912,11 +913,9 @@ void resume_console(void)
912void acquire_console_sem(void) 913void acquire_console_sem(void)
913{ 914{
914 BUG_ON(in_interrupt()); 915 BUG_ON(in_interrupt());
915 if (console_suspended) {
916 down(&secondary_console_sem);
917 return;
918 }
919 down(&console_sem); 916 down(&console_sem);
917 if (console_suspended)
918 return;
920 console_locked = 1; 919 console_locked = 1;
921 console_may_schedule = 1; 920 console_may_schedule = 1;
922} 921}
@@ -926,6 +925,10 @@ int try_acquire_console_sem(void)
926{ 925{
927 if (down_trylock(&console_sem)) 926 if (down_trylock(&console_sem))
928 return -1; 927 return -1;
928 if (console_suspended) {
929 up(&console_sem);
930 return -1;
931 }
929 console_locked = 1; 932 console_locked = 1;
930 console_may_schedule = 0; 933 console_may_schedule = 0;
931 return 0; 934 return 0;
@@ -979,7 +982,7 @@ void release_console_sem(void)
979 unsigned wake_klogd = 0; 982 unsigned wake_klogd = 0;
980 983
981 if (console_suspended) { 984 if (console_suspended) {
982 up(&secondary_console_sem); 985 up(&console_sem);
983 return; 986 return;
984 } 987 }
985 988