diff options
| author |   Jiri Slaby <jslaby@suse.cz> | 2016-10-03 11:18:35 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-27 16:37:44 +0200 |
| commit | 35cc56f9a30480c8a0cca809cf341614a2144758 (patch) | |
| tree | f7edce136762932eaad0c7a448c72e3a1df3006d /drivers/video/console/vgacon.c | |
| parent | tty: vt, unify scrolling functions (diff) | |
| download | linux-dev-35cc56f9a30480c8a0cca809cf341614a2144758.tar.xz linux-dev-35cc56f9a30480c8a0cca809cf341614a2144758.zip | |
tty: vgacon+sisusb, move scrolldelta to a common helper
The code is mirrorred in scrolldelta implementations of both vgacon
and sisusb. Let's move the code to a separate helper where we will
perform a common cleanup and further changes.
While we are moving the code, make it linear and save one indentation
level. This is done by returning from the "!lines" then-branch
immediatelly. This allows flushing the else-branch 1 level to the
left, obviously.
Few more new lines and comments were added too.
And do not forget to export the helper function given sisusb can be
built as module.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: <linux-fbdev@vger.kernel.org>
Cc: <linux-usb@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video/console/vgacon.c')
| -rw-r--r-- | drivers/video/console/vgacon.c | 27 |
1 files changed, 2 insertions, 25 deletions
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 4c54a873452e..ede6a5a85ccd 100644 --- a/drivers/video/console/vgacon.c +++ b/drivers/video/console/vgacon.c @@ -332,31 +332,8 @@ static void vgacon_restore_screen(struct vc_data *c) static void vgacon_scrolldelta(struct vc_data *c, int lines) { - if (!lines) /* Turn scrollback off */ - c->vc_visible_origin = c->vc_origin; - else { - int margin = c->vc_size_row * 4; - int ul, we, p, st; - - if (vga_rolled_over > - (c->vc_scr_end - vga_vram_base) + margin) { - ul = c->vc_scr_end - vga_vram_base; - we = vga_rolled_over + c->vc_size_row; - } else { - ul = 0; - we = vga_vram_size; - } - p = (c->vc_visible_origin - vga_vram_base - ul + we) % we + - lines * c->vc_size_row; - st = (c->vc_origin - vga_vram_base - ul + we) % we; - if (st < 2 * margin) - margin = 0; - if (p < margin) - p = 0; - if (p > st - margin) - p = st; - c->vc_visible_origin = vga_vram_base + (p + ul) % we; - } + vc_scrolldelta_helper(c, lines, vga_rolled_over, (void *)vga_vram_base, + vga_vram_size); vga_set_mem_top(c); } #endif /* CONFIG_VGACON_SOFT_SCROLLBACK */ |