diff options
| author | Jason Wessel <jason.wessel@windriver.com> | 2010-03-03 15:35:55 -0600 |
|---|---|---|
| committer | Jason Wessel <jason.wessel@windriver.com> | 2010-03-03 15:35:55 -0600 |
| commit | 8b1f8e0baba1e8b49621e8cf39256bb56b0d6e06 (patch) | |
| tree | 9a43744f2aec5bd2a331eb093321aefb95c487fa /drivers/serial | |
| parent | 6bddd57aeac186f65f2be6a5317adc83571745ff (diff) | |
keyboard,kgdboc: Allow key release on kernel resume
When using a keyboard with kdb, a hook point to free all the
keystrokes is required for resuming kernel operations.
This is mainly because there is no way to force the end user to hold
down the original keys that were pressed prior to entering kdb when
resuming the kernel.
The kgdboc driver will call kbd_dbg_clear_keys() just prior to
resuming the kernel execution which will schedule a callback to clear
any keys which were depressed prior to the entering the kernel
debugger.
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Greg Kroah-Hartman <gregkh@suse.de>
CC: linux-input@vger.kernel.org
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/kgdboc.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c index a9a94ae72349..5af32b48d499 100644 --- a/drivers/serial/kgdboc.c +++ b/drivers/serial/kgdboc.c @@ -17,6 +17,7 @@ #include <linux/kdb.h> #include <linux/tty.h> #include <linux/console.h> +#include <linux/kbd_kern.h> #define MAX_CONFIG_LEN 40 @@ -35,12 +36,16 @@ static struct tty_driver *kgdb_tty_driver; static int kgdb_tty_line; #ifdef CONFIG_KDB_KEYBOARD +static bool kgdboc_use_kbd; + static int kgdboc_register_kbd(char **cptr) { + kgdboc_use_kbd = false; if (strncmp(*cptr, "kbd", 3) == 0) { if (kdb_poll_idx < KDB_POLL_FUNC_MAX) { kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char; kdb_poll_idx++; + kgdboc_use_kbd = true; if (cptr[0][3] == ',') *cptr += 4; else @@ -63,9 +68,16 @@ static void kgdboc_unregister_kbd(void) } } } + +static inline void kgdboc_clear_kbd(void) +{ + if (kgdboc_use_kbd) + kbd_dbg_clear_keys(); /* Release all pressed keys */ +} #else /* ! CONFIG_KDB_KEYBOARD */ #define kgdboc_register_kbd(x) 0 #define kgdboc_unregister_kbd() +#define kgdboc_clear_kbd() #endif /* ! CONFIG_KDB_KEYBOARD */ static int kgdboc_option_setup(char *opt) @@ -213,6 +225,7 @@ static void kgdboc_post_exp_handler(void) /* decrement the module count when the debugger detaches */ if (!kgdb_connected) module_put(THIS_MODULE); + kgdboc_clear_kbd(); } static struct kgdb_io kgdboc_io_ops = { |