From 35cc56f9a30480c8a0cca809cf341614a2144758 Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Mon, 3 Oct 2016 11:18:35 +0200 Subject: [PATCH] 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 Cc: Thomas Winischhofer Cc: Tomi Valkeinen Cc: Cc: Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 38 +++++++++++++++++++++++++++++++++ drivers/usb/misc/sisusbvga/sisusb_con.c | 37 ++------------------------------ drivers/video/console/vgacon.c | 27 ++--------------------- include/linux/vt_kern.h | 2 ++ 4 files changed, 44 insertions(+), 60 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index a0b7576..2eab714 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -4279,6 +4279,44 @@ void vcs_scr_updated(struct vc_data *vc) notify_update(vc); } +void vc_scrolldelta_helper(struct vc_data *c, int lines, + unsigned int rolled_over, void *base, unsigned int size) +{ + unsigned long ubase = (unsigned long)base; + int margin = c->vc_size_row * 4; + int ul, we, p, st; + + /* Turn scrollback off */ + if (!lines) { + c->vc_visible_origin = c->vc_origin; + return; + } + + /* Do we have already enough to allow jumping from 0 to the end? */ + if (rolled_over > (c->vc_scr_end - ubase) + margin) { + ul = c->vc_scr_end - ubase; + we = rolled_over + c->vc_size_row; + } else { + ul = 0; + we = size; + } + + p = (c->vc_visible_origin - ubase - ul + we) % we + + lines * c->vc_size_row; + st = (c->vc_origin - ubase - ul + we) % we; + + /* Only a little piece would be left? Show all incl. the piece! */ + if (st < 2 * margin) + margin = 0; + if (p < margin) + p = 0; + if (p > st - margin) + p = st; + + c->vc_visible_origin = ubase + (p + ul) % we; +} +EXPORT_SYMBOL_GPL(vc_scrolldelta_helper); + /* * Visible symbols for modules */ diff --git a/drivers/usb/misc/sisusbvga/sisusb_con.c b/drivers/usb/misc/sisusbvga/sisusb_con.c index 6331965..4b5777e 100644 --- a/drivers/usb/misc/sisusbvga/sisusb_con.c +++ b/drivers/usb/misc/sisusbvga/sisusb_con.c @@ -686,8 +686,6 @@ static void sisusbcon_scrolldelta(struct vc_data *c, int lines) { struct sisusb_usb_data *sisusb; - int margin = c->vc_size_row * 4; - int ul, we, p, st; sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num); if (!sisusb) @@ -700,39 +698,8 @@ sisusbcon_scrolldelta(struct vc_data *c, int lines) return; } - if (!lines) /* Turn scrollback off */ - c->vc_visible_origin = c->vc_origin; - else { - - if (sisusb->con_rolled_over > - (c->vc_scr_end - sisusb->scrbuf) + margin) { - - ul = c->vc_scr_end - sisusb->scrbuf; - we = sisusb->con_rolled_over + c->vc_size_row; - - } else { - - ul = 0; - we = sisusb->scrbuf_size; - - } - - p = (c->vc_visible_origin - sisusb->scrbuf - ul + we) % we + - lines * c->vc_size_row; - - st = (c->vc_origin - sisusb->scrbuf - ul + we) % we; - - if (st < 2 * margin) - margin = 0; - - if (p < margin) - p = 0; - - if (p > st - margin) - p = st; - - c->vc_visible_origin = sisusb->scrbuf + (p + ul) % we; - } + vc_scrolldelta_helper(c, lines, sisusb->con_rolled_over, + (void *)sisusb->scrbuf, sisusb->scrbuf_size); sisusbcon_set_start_address(sisusb, c); diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c index 4c54a87..ede6a5a 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 */ diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h index 6abd24f..833fdd4 100644 --- a/include/linux/vt_kern.h +++ b/include/linux/vt_kern.h @@ -191,5 +191,7 @@ extern void vt_set_led_state(int console, int leds); extern void vt_kbd_con_start(int console); extern void vt_kbd_con_stop(int console); +void vc_scrolldelta_helper(struct vc_data *c, int lines, + unsigned int rolled_over, void *_base, unsigned int size); #endif /* _VT_KERN_H */ -- 2.7.4