fbdev: don't show logo if driver or fbcon are modular
It was always intended for the logo to be drawn only if both fbcon and the driver that is mapped to it are both compiled statically. Currently, if fbcon is loaded prior to the driver, the logo is not shown. Reverse the order, and the code may attempt to draw the logo which is __initdata. By accident, this bug is rarely seen because this method of loading the modules is not common and secondly, a code in fb_prepare_logo() that checks the height of the logo (now a random value) rarely succeeds. Fix by drawing the logo only if both fbcon and the driver are statically compiled. Signed-off-by: Antonino Daplas <adaplas@gmail.com> Cc: Jean Delvare <khali@linux-fr.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -107,7 +107,9 @@ static struct display fb_display[MAX_NR_CONSOLES];
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static signed char con2fb_map[MAX_NR_CONSOLES];
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static signed char con2fb_map_boot[MAX_NR_CONSOLES];
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#ifndef MODULE
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static int logo_height;
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#endif
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static int logo_lines;
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/* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
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enums. */
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@ -576,6 +578,13 @@ static int fbcon_takeover(int show_logo)
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return err;
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}
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#ifdef MODULE
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static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
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int cols, int rows, int new_cols, int new_rows)
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{
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logo_shown = FBCON_LOGO_DONTSHOW;
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}
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#else
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static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
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int cols, int rows, int new_cols, int new_rows)
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{
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@ -584,6 +593,11 @@ static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
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int cnt, erase = vc->vc_video_erase_char, step;
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unsigned short *save = NULL, *r, *q;
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if (info->flags & FBINFO_MODULE) {
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logo_shown = FBCON_LOGO_DONTSHOW;
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return;
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}
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/*
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* remove underline attribute from erase character
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* if black and white framebuffer.
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@ -655,6 +669,7 @@ static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
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vc->vc_top = logo_lines;
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}
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}
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#endif /* MODULE */
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#ifdef CONFIG_FB_TILEBLITTING
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static void set_blitting_type(struct vc_data *vc, struct fb_info *info)
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@ -418,7 +418,8 @@ int fb_prepare_logo(struct fb_info *info, int rotate)
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memset(&fb_logo, 0, sizeof(struct logo_data));
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if (info->flags & FBINFO_MISC_TILEBLITTING)
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if (info->flags & FBINFO_MISC_TILEBLITTING ||
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info->flags & FBINFO_MODULE)
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return 0;
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if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {
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@ -483,7 +484,8 @@ int fb_show_logo(struct fb_info *info, int rotate)
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struct fb_image image;
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/* Return if the frame buffer is not mapped or suspended */
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if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
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if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
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info->flags & FBINFO_MODULE)
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return 0;
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image.depth = 8;
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