Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

[pandora-kernel.git] / drivers / tty / sysrq.c

diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index c556ed9..81f1395 100644 (file)
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -46,7 +46,7 @@
 #include <asm/irq_regs.h>
 
 /* Whether we react on sysrq keys or just ignore them */
-static int __read_mostly sysrq_enabled = 1;
+static int __read_mostly sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 static bool __read_mostly sysrq_always_enabled;
 
 static bool sysrq_on(void)
@@ -571,6 +571,7 @@ struct sysrq_state {
        unsigned int alt_use;
        bool active;
        bool need_reinject;
+       bool reinjecting;
 };
 
 static void sysrq_reinject_alt_sysrq(struct work_struct *work)
@@ -581,6 +582,10 @@ static void sysrq_reinject_alt_sysrq(struct work_struct *work)
        unsigned int alt_code = sysrq->alt_use;
 
        if (sysrq->need_reinject) {
+               /* we do not want the assignment to be reordered */
+               sysrq->reinjecting = true;
+               mb();
+
                /* Simulate press and release of Alt + SysRq */
                input_inject_event(handle, EV_KEY, alt_code, 1);
                input_inject_event(handle, EV_KEY, KEY_SYSRQ, 1);
@@ -589,6 +594,9 @@ static void sysrq_reinject_alt_sysrq(struct work_struct *work)
                input_inject_event(handle, EV_KEY, KEY_SYSRQ, 0);
                input_inject_event(handle, EV_KEY, alt_code, 0);
                input_inject_event(handle, EV_SYN, SYN_REPORT, 1);
+
+               mb();
+               sysrq->reinjecting = false;
        }
 }
 
@@ -599,6 +607,13 @@ static bool sysrq_filter(struct input_handle *handle,
        bool was_active = sysrq->active;
        bool suppress;
 
+       /*
+        * Do not filter anything if we are in the process of re-injecting
+        * Alt+SysRq combination.
+        */
+       if (sysrq->reinjecting)
+               return false;
+
        switch (type) {
 
        case EV_SYN:
@@ -629,7 +644,7 @@ static bool sysrq_filter(struct input_handle *handle,
                                sysrq->alt_use = sysrq->alt;
                                /*
                                 * If nothing else will be pressed we'll need
-                                * to * re-inject Alt-SysRq keysroke.
+                                * to re-inject Alt-SysRq keysroke.
                                 */
                                sysrq->need_reinject = true;
                        }