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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-09-29 02:00:03 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:12 -0700
commitca9bda00b4aafc42cd3d1b9d32934463e2993b4c (patch)
treedbb7ba5320bb8d1cbf97b3493687cb87932ad5f4 /drivers/char/vt.c
parentae78bf9c4f5fde3c67e2829505f195d7347ce3e4 (diff)
[PATCH] tty locking on resize
The current kernel serializes console resizes but does not serialize the resize against the tty structure updates. This means that while two parallel resizes cannot mess up the console you can get incorrect results reported. Secondly while doing this I added vc_lock_resize() to lock and resize the console. This leaves all knowledge of the console_sem in the vt/console driver and kicks it out of the tty layer, which is good Thirdly while doing this I decided I couldn't stand "disallocate" any longer so I switched it to "deallocate". Signed-off-by: Alan Cox <alan@redhat.com> Cc: Paul Fulghum <paulkf@microgate.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/vt.c')
-rw-r--r--drivers/char/vt.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 0fca83ededf..b49f0337543 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -885,8 +885,17 @@ int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
return err;
}
+int vc_lock_resize(struct vc_data *vc, unsigned int cols, unsigned int lines)
+{
+ int rc;
+
+ acquire_console_sem();
+ rc = vc_resize(vc, cols, lines);
+ release_console_sem();
+ return rc;
+}
-void vc_disallocate(unsigned int currcons)
+void vc_deallocate(unsigned int currcons)
{
WARN_CONSOLE_UNLOCKED();
@@ -3790,6 +3799,7 @@ EXPORT_SYMBOL(default_blu);
EXPORT_SYMBOL(update_region);
EXPORT_SYMBOL(redraw_screen);
EXPORT_SYMBOL(vc_resize);
+EXPORT_SYMBOL(vc_lock_resize);
EXPORT_SYMBOL(fg_console);
EXPORT_SYMBOL(console_blank_hook);
EXPORT_SYMBOL(console_blanked);