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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2010-03-21 22:31:26 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2010-04-13 23:26:02 -0700
commit97f5f0cd8cd0a05449cbb77d1e6f02e026875802 (patch)
treee101f38dfd7bf4e759e96617f69ceedd497608e3 /kernel/sysctl.c
parentb91c4be730668e801aa6a2ea95f467cd9a1e0983 (diff)
downloadlwn-97f5f0cd8cd0a05449cbb77d1e6f02e026875802.tar.gz
lwn-97f5f0cd8cd0a05449cbb77d1e6f02e026875802.zip
Input: implement SysRq as a separate input handler
Instead of keeping SysRq support inside of legacy keyboard driver split it out into a separate input handler (filter). This stops most SysRq input events from leaking into evdev clients (some events, such as first SysRq scancode - not keycode - event, are still leaked into both legacy keyboard and evdev). [martinez.javier@gmail.com: fix compile error when CONFIG_MAGIC_SYSRQ is not defined] Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c23
1 files changed, 22 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 8686b0f5fc12..ce724a0dd0bb 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -163,6 +163,27 @@ static int proc_taint(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
+#ifdef CONFIG_MAGIC_SYSRQ
+static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
+
+static int sysrq_sysctl_handler(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp,
+ loff_t *ppos)
+{
+ int error;
+
+ error = proc_dointvec(table, write, buffer, lenp, ppos);
+ if (error)
+ return error;
+
+ if (write)
+ sysrq_toggle_support(__sysrq_enabled);
+
+ return 0;
+}
+
+#endif
+
static struct ctl_table root_table[];
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
@@ -567,7 +588,7 @@ static struct ctl_table kern_table[] = {
.data = &__sysrq_enabled,
.maxlen = sizeof (int),
.mode = 0644,
- .proc_handler = proc_dointvec,
+ .proc_handler = sysrq_sysctl_handler,
},
#endif
#ifdef CONFIG_PROC_SYSCTL