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-rw-r--r--kernel/power/console.c63
1 files changed, 5 insertions, 58 deletions
diff --git a/kernel/power/console.c b/kernel/power/console.c
index a3961b205de7..5187136fe1de 100644
--- a/kernel/power/console.c
+++ b/kernel/power/console.c
@@ -14,56 +14,13 @@
14#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) 14#define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
15 15
16static int orig_fgconsole, orig_kmsg; 16static int orig_fgconsole, orig_kmsg;
17static int disable_vt_switch;
18
19/*
20 * Normally during a suspend, we allocate a new console and switch to it.
21 * When we resume, we switch back to the original console. This switch
22 * can be slow, so on systems where the framebuffer can handle restoration
23 * of video registers anyways, there's little point in doing the console
24 * switch. This function allows you to disable it by passing it '0'.
25 */
26void pm_set_vt_switch(int do_switch)
27{
28 acquire_console_sem();
29 disable_vt_switch = !do_switch;
30 release_console_sem();
31}
32EXPORT_SYMBOL(pm_set_vt_switch);
33 17
34int pm_prepare_console(void) 18int pm_prepare_console(void)
35{ 19{
36 acquire_console_sem(); 20 orig_fgconsole = vt_move_to_console(SUSPEND_CONSOLE, 1);
37 21 if (orig_fgconsole < 0)
38 if (disable_vt_switch) {
39 release_console_sem();
40 return 0;
41 }
42
43 orig_fgconsole = fg_console;
44
45 if (vc_allocate(SUSPEND_CONSOLE)) {
46 /* we can't have a free VC for now. Too bad,
47 * we don't want to mess the screen for now. */
48 release_console_sem();
49 return 1; 22 return 1;
50 }
51 23
52 if (set_console(SUSPEND_CONSOLE)) {
53 /*
54 * We're unable to switch to the SUSPEND_CONSOLE.
55 * Let the calling function know so it can decide
56 * what to do.
57 */
58 release_console_sem();
59 return 1;
60 }
61 release_console_sem();
62
63 if (vt_waitactive(SUSPEND_CONSOLE)) {
64 pr_debug("Suspend: Can't switch VCs.");
65 return 1;
66 }
67 orig_kmsg = kmsg_redirect; 24 orig_kmsg = kmsg_redirect;
68 kmsg_redirect = SUSPEND_CONSOLE; 25 kmsg_redirect = SUSPEND_CONSOLE;
69 return 0; 26 return 0;
@@ -71,19 +28,9 @@ int pm_prepare_console(void)
71 28
72void pm_restore_console(void) 29void pm_restore_console(void)
73{ 30{
74 acquire_console_sem(); 31 if (orig_fgconsole >= 0) {
75 if (disable_vt_switch) { 32 vt_move_to_console(orig_fgconsole, 0);
76 release_console_sem(); 33 kmsg_redirect = orig_kmsg;
77 return;
78 }
79 set_console(orig_fgconsole);
80 release_console_sem();
81
82 if (vt_waitactive(orig_fgconsole)) {
83 pr_debug("Resume: Can't switch VCs.");
84 return;
85 } 34 }
86
87 kmsg_redirect = orig_kmsg;
88} 35}
89#endif 36#endif