fbdev: Don't show logo if driver or fbcon are modular

PATCH Superseded Antonino A. Daplas 1 participant 2 messages Apr 9, 2007

Subsystems (2)

Framebuffer layer Console

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Antonino A. Daplas

author

2007-04-09 11:45 UTC #0 lore raw

PATCH 1/7 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 <[email protected]>

---

 drivers/video/console/fbcon.c |   17 +++++++++++++++++
 drivers/video/fbmem.c         |    6 ++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

drivers/video/console/fbcon.c +17 -0

index f1e3e3c..0d8e107 100644
@@ -107,7 +107,9 @@ static struct display fb_display[MAX_NR_
 
 static signed char con2fb_map[MAX_NR_CONSOLES];
 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
+#ifndef MODULE
 static int logo_height;
+#endif
 static int logo_lines;
 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
    enums.  */

@@ -576,6 +578,13 @@ static int fbcon_takeover(int show_logo)
 	return err;
 }
 
+#ifdef MODULE
+static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
+			       int cols, int rows, int new_cols, int new_rows)
+{
+	logo_shown = FBCON_LOGO_DONTSHOW;
+}
+#else
 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 			       int cols, int rows, int new_cols, int new_rows)
 {

@@ -584,6 +593,11 @@ static void fbcon_prepare_logo(struct vc
 	int cnt, erase = vc->vc_video_erase_char, step;
 	unsigned short *save = NULL, *r, *q;
 
+	if (info->flags & FBINFO_MODULE) {
+		logo_shown = FBCON_LOGO_DONTSHOW;
+		goto done;
+	}
+
 	/*
 	 * remove underline attribute from erase character
 	 * if black and white framebuffer.

@@ -654,7 +668,10 @@ static void fbcon_prepare_logo(struct vc
 		logo_shown = FBCON_LOGO_DRAW;
 		vc->vc_top = logo_lines;
 	}
+
+done:
 }
+#endif /* MODULE */
 
 #ifdef CONFIG_FB_TILEBLITTING
 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)

drivers/video/fbmem.c +4 -2

index 45f3839..08c292d 100644
@@ -418,7 +418,8 @@ int fb_prepare_logo(struct fb_info *info
 
 	memset(&fb_logo, 0, sizeof(struct logo_data));
 
-	if (info->flags & FBINFO_MISC_TILEBLITTING)
+	if (info->flags & FBINFO_MISC_TILEBLITTING ||
+	    info->flags & FBINFO_MODULE)
 		return 0;
 
 	if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {

@@ -483,7 +484,8 @@ int fb_show_logo(struct fb_info *info, i
 	struct fb_image image;
 
 	/* Return if the frame buffer is not mapped or suspended */
-	if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
+	if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
+	    info->flags & FBINFO_MODULE)
 		return 0;
 
 	image.depth = 8;

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Antonino A. Daplas

author

2007-04-09 16:14 UTC #1 lore raw

PATCH RESEND 1/7 bdev: Don't show logo if driver or fbcon are modular

Fix by drawing the logo only if both fbcon and the driver are statically compiled.

Signed-off-by Antonino Daplas <[email protected]>

---

 drivers/video/console/fbcon.c |   15 +++++++++++++++
 drivers/video/fbmem.c         |    6 ++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

drivers/video/console/fbcon.c +15 -0

index f1e3e3c..c8b4ae6 100644
@@ -107,7 +107,9 @@ static struct display fb_display[MAX_NR_
 
 static signed char con2fb_map[MAX_NR_CONSOLES];
 static signed char con2fb_map_boot[MAX_NR_CONSOLES];
+#ifndef MODULE
 static int logo_height;
+#endif
 static int logo_lines;
 /* logo_shown is an index to vc_cons when >= 0; otherwise follows FBCON_LOGO
    enums.  */

@@ -576,6 +578,13 @@ static int fbcon_takeover(int show_logo)
 	return err;
 }
 
+#ifdef MODULE
+static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
+			       int cols, int rows, int new_cols, int new_rows)
+{
+	logo_shown = FBCON_LOGO_DONTSHOW;
+}
+#else
 static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,
 			       int cols, int rows, int new_cols, int new_rows)
 {

@@ -584,6 +593,11 @@ static void fbcon_prepare_logo(struct vc
 	int cnt, erase = vc->vc_video_erase_char, step;
 	unsigned short *save = NULL, *r, *q;
 
+	if (info->flags & FBINFO_MODULE) {
+		logo_shown = FBCON_LOGO_DONTSHOW;
+		return;
+	}
+
 	/*
 	 * remove underline attribute from erase character
 	 * if black and white framebuffer.

@@ -655,6 +669,7 @@ static void fbcon_prepare_logo(struct vc
 		vc->vc_top = logo_lines;
 	}
 }
+#endif /* MODULE */
 
 #ifdef CONFIG_FB_TILEBLITTING
 static void set_blitting_type(struct vc_data *vc, struct fb_info *info)

drivers/video/fbmem.c +4 -2

index 45f3839..08c292d 100644
@@ -418,7 +418,8 @@ int fb_prepare_logo(struct fb_info *info
 
 	memset(&fb_logo, 0, sizeof(struct logo_data));
 
-	if (info->flags & FBINFO_MISC_TILEBLITTING)
+	if (info->flags & FBINFO_MISC_TILEBLITTING ||
+	    info->flags & FBINFO_MODULE)
 		return 0;
 
 	if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) {

@@ -483,7 +484,8 @@ int fb_show_logo(struct fb_info *info, i
 	struct fb_image image;
 
 	/* Return if the frame buffer is not mapped or suspended */
-	if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING)
+	if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING ||
+	    info->flags & FBINFO_MODULE)
 		return 0;
 
 	image.depth = 8;