video: deferred io cleanup fix for sh_mobile_lcdcfb

Fix deferred io cleanup patch in the sh_mobile_lcdcfb driver.

If probe() fails early the sh_mobile_lcdc_stop() function will
be called to clean up deferred io. This patch modifies the
code to only call fb_deferred_io_cleanup() after deferred io
has been initialized.

With this patch applied we no longer hit BUG_ON() inside
fb_deferred_io_cleanup(). Triggers on a Migo-R with the
SYS QVGA panel board unmounted.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index 0e2b8fd..2c5d069 100644 (file)
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -446,7 +446,6 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
 {
        struct sh_mobile_lcdc_chan *ch;
        struct sh_mobile_lcdc_board_cfg *board_cfg;
-       unsigned long tmp;
        int k;
 
        /* tell the board code to disable the panel */
@@ -456,9 +455,8 @@ static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
                if (board_cfg->display_off)
                        board_cfg->display_off(board_cfg->board_data);
 
-               /* cleanup deferred io if SYS bus */
-               tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
-               if (ch->ldmt1r_value & (1 << 12) && tmp) {
+               /* cleanup deferred io if enabled */
+               if (ch->info.fbdefio) {
                        fb_deferred_io_cleanup(&ch->info);
                        ch->info.fbdefio = NULL;
                }