From: Florian Tobias Schandinat Date: Tue, 22 Sep 2009 23:47:44 +0000 (-0700) Subject: fb: do not ignore fb_set_par errors X-Git-Tag: v2.6.32-rc1~193 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0fcf6ada2b8eb42d132c0846384f1299889609e3;p=platform%2Fkernel%2Flinux-stable.git fb: do not ignore fb_set_par errors At the moment about half of the framebuffer drivers can return an error code in fb_set_par. Until now it would be silently ignored by fbmem.c and fbcon.c. This patch fixes fbmem.c to return the error code and restore var on error. But it is not clear in which video mode the device is when fb_set_par fails. It would be good and reasonable if it were in the old state but there is no guarantee that this is true for all existing drivers. Additionally print a message if a failing fb_set_par is detected in fbmem.c or fbcon.c. Although most errors should be caught by the previous fb_check_var some errors can't as they are dynamic (memory allocations, ...) and can only be detected while performing the operations which is forbidden in fb_check_var. This patch shouldn't have a negative impact on normal operation as all drivers return 0 on success. The impact in case of error depends heavily on the driver and caller but it's expected to be better than before. Signed-off-by: Florian Tobias Schandinat Cc: Krzysztof Helt Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c index 3a44695..4bee7c2 100644 --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -725,7 +725,7 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo, int oldidx, int found) { struct fbcon_ops *ops = oldinfo->fbcon_par; - int err = 0; + int err = 0, ret; if (oldinfo->fbops->fb_release && oldinfo->fbops->fb_release(oldinfo, 0)) { @@ -752,8 +752,14 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo, newinfo in an undefined state. Thus, a call to fb_set_par() may be needed for the newinfo. */ - if (newinfo->fbops->fb_set_par) - newinfo->fbops->fb_set_par(newinfo); + if (newinfo->fbops->fb_set_par) { + ret = newinfo->fbops->fb_set_par(newinfo); + + if (ret) + printk(KERN_ERR "con2fb_release_oldinfo: " + "detected unhandled fb_set_par error, " + "error code %d\n", ret); + } } return err; @@ -763,11 +769,18 @@ static void con2fb_init_display(struct vc_data *vc, struct fb_info *info, int unit, int show_logo) { struct fbcon_ops *ops = info->fbcon_par; + int ret; ops->currcon = fg_console; - if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) - info->fbops->fb_set_par(info); + if (info->fbops->fb_set_par && !(ops->flags & FBCON_FLAGS_INIT)) { + ret = info->fbops->fb_set_par(info); + + if (ret) + printk(KERN_ERR "con2fb_init_display: detected " + "unhandled fb_set_par error, " + "error code %d\n", ret); + } ops->flags |= FBCON_FLAGS_INIT; ops->graphics = 0; @@ -1006,7 +1019,7 @@ static void fbcon_init(struct vc_data *vc, int init) struct vc_data *svc = *default_mode; struct display *t, *p = &fb_display[vc->vc_num]; int logo = 1, new_rows, new_cols, rows, cols, charcnt = 256; - int cap; + int cap, ret; if (info_idx == -1 || info == NULL) return; @@ -1092,8 +1105,15 @@ static void fbcon_init(struct vc_data *vc, int init) */ if (CON_IS_VISIBLE(vc) && vc->vc_mode == KD_TEXT) { if (info->fbops->fb_set_par && - !(ops->flags & FBCON_FLAGS_INIT)) - info->fbops->fb_set_par(info); + !(ops->flags & FBCON_FLAGS_INIT)) { + ret = info->fbops->fb_set_par(info); + + if (ret) + printk(KERN_ERR "fbcon_init: detected " + "unhandled fb_set_par error, " + "error code %d\n", ret); + } + ops->flags |= FBCON_FLAGS_INIT; } @@ -2119,7 +2139,7 @@ static int fbcon_switch(struct vc_data *vc) struct fbcon_ops *ops; struct display *p = &fb_display[vc->vc_num]; struct fb_var_screeninfo var; - int i, prev_console, charcnt = 256; + int i, ret, prev_console, charcnt = 256; info = registered_fb[con2fb_map[vc->vc_num]]; ops = info->fbcon_par; @@ -2174,8 +2194,14 @@ static int fbcon_switch(struct vc_data *vc) if (old_info != NULL && (old_info != info || info->flags & FBINFO_MISC_ALWAYS_SETPAR)) { - if (info->fbops->fb_set_par) - info->fbops->fb_set_par(info); + if (info->fbops->fb_set_par) { + ret = info->fbops->fb_set_par(info); + + if (ret) + printk(KERN_ERR "fbcon_switch: detected " + "unhandled fb_set_par error, " + "error code %d\n", ret); + } if (old_info != info) fbcon_del_cursor_timer(old_info); diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index 346f257..a1f2e7c 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -954,6 +954,7 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) goto done; if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { + struct fb_var_screeninfo old_var; struct fb_videomode mode; if (info->fbops->fb_get_caps) { @@ -963,10 +964,20 @@ fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) goto done; } + old_var = info->var; info->var = *var; - if (info->fbops->fb_set_par) - info->fbops->fb_set_par(info); + if (info->fbops->fb_set_par) { + ret = info->fbops->fb_set_par(info); + + if (ret) { + info->var = old_var; + printk(KERN_WARNING "detected " + "fb_set_par error, " + "error code: %d\n", ret); + goto done; + } + } fb_pan_display(info, &info->var); fb_set_cmap(&info->cmap, info);