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tty: vgacon+sisusb, move scrolldelta to a common helper

Browse source 
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 <[email protected]>
Cc: Thomas Winischhofer <[email protected]>
Cc: Tomi Valkeinen <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Jiri Slaby 2016-10-03 11:18:35 +02:00 • committed by Greg Kroah-Hartman
commit 35cc56f9a3
4 changed files with 44 additions and 60 deletions
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27
drivers/video/console/vgacon.c
View file

@ -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 */