samsung_sm8750/android_kernel_samsung_sm8750
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[PATCH] tty locking on resize

Browse Source 
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>
This commit is contained in:
Alan Cox
2006-09-29 02:00:03 -07:00
committed by Linus Torvalds
parent ae78bf9c4f
commit ca9bda00b4
5 changed files with 36 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/char/vt.c
View File

@@ -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;
void vc_disallocate(unsigned int currcons)
acquire_console_sem();
rc = vc_resize(vc, cols, lines);
release_console_sem();
return rc;
}
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);