diff options
| author | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-05-28 12:02:35 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2019-06-12 21:27:13 +0300 |
| commit | ddde3c18b70061cc09b84a52624909349c212822 (patch) | |
| tree | 6dda603611fbbcb6bdafea499f4977046ef1e972 /drivers/tty | |
| parent | a135513c0b579be55c534b35e628be55578576b2 (diff) | |
| download | linux-ddde3c18b70061cc09b84a52624909349c212822.tar.xz | |
vt: More locking checks
I honestly have no idea what the subtle differences between
con_is_visible, con_is_fg (internal to vt.c) and con_is_bound are. But
it looks like both vc->vc_display_fg and con_driver_map are protected
by the console_lock, so probably better if we hold that when checking
this.
To do that I had to deinline the con_is_visible function.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Martin Hostettler <textshell@uchuujin.de>
Cc: Adam Borowski <kilobyte@angband.pl>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528090304.9388-5-daniel.vetter@ffwll.ch
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/vt.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 30d29a04bfee..ec92f36ab5c4 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3822,6 +3822,8 @@ int con_is_bound(const struct consw *csw) { int i, bound = 0; + WARN_CONSOLE_UNLOCKED(); + for (i = 0; i < MAX_NR_CONSOLES; i++) { if (con_driver_map[i] == csw) { bound = 1; @@ -3834,6 +3836,20 @@ int con_is_bound(const struct consw *csw) EXPORT_SYMBOL(con_is_bound); /** + * con_is_visible - checks whether the current console is visible + * @vc: virtual console + * + * RETURNS: zero if not visible, nonzero if visible + */ +bool con_is_visible(const struct vc_data *vc) +{ + WARN_CONSOLE_UNLOCKED(); + + return *vc->vc_display_fg == vc; +} +EXPORT_SYMBOL(con_is_visible); + +/** * con_debug_enter - prepare the console for the kernel debugger * @sw: console driver * |