fbdev/vesafb: Replace references to global screen_info by local pointer

Get the global screen_info's address once and access the data via
this pointer. Limits the use of global state.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231206135153.2599-4-tzimmermann@suse.de

drivers/video/fbdev/vesafb.c

@@ -243,6 +243,7 @@ static int vesafb_setup(char *options)
 
 static int vesafb_probe(struct platform_device *dev)
 {
+	struct screen_info *si = &screen_info;
 	struct fb_info *info;
 	struct vesafb_par *par;
 	int i, err;
@@ -255,17 +256,17 @@ static int vesafb_probe(struct platform_device *dev)
 	fb_get_options("vesafb", &option);
 	vesafb_setup(option);
 
-	if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
+	if (si->orig_video_isVGA != VIDEO_TYPE_VLFB)
 		return -ENODEV;
 
-	vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
-	vesafb_fix.smem_start = screen_info.lfb_base;
-	vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
+	vga_compat = (si->capabilities & 2) ? 0 : 1;
+	vesafb_fix.smem_start = si->lfb_base;
+	vesafb_defined.bits_per_pixel = si->lfb_depth;
 	if (15 == vesafb_defined.bits_per_pixel)
 		vesafb_defined.bits_per_pixel = 16;
-	vesafb_defined.xres = screen_info.lfb_width;
-	vesafb_defined.yres = screen_info.lfb_height;
-	vesafb_fix.line_length = screen_info.lfb_linelength;
+	vesafb_defined.xres = si->lfb_width;
+	vesafb_defined.yres = si->lfb_height;
+	vesafb_fix.line_length = si->lfb_linelength;
 	vesafb_fix.visual   = (vesafb_defined.bits_per_pixel == 8) ?
 		FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
 
@@ -277,7 +278,7 @@ static int vesafb_probe(struct platform_device *dev)
 	/*   size_total -- all video memory we have. Used for mtrr
 	 *                 entries, resource allocation and bounds
 	 *                 checking. */
-	size_total = screen_info.lfb_size * 65536;
+	size_total = si->lfb_size * 65536;
 	if (vram_total)
 		size_total = vram_total * 1024 * 1024;
 	if (size_total < size_vmode)
@@ -297,7 +298,7 @@ static int vesafb_probe(struct platform_device *dev)
 	vesafb_fix.smem_len = size_remap;
 
 #ifndef __i386__
-	screen_info.vesapm_seg = 0;
+	si->vesapm_seg = 0;
 #endif
 
 	if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
@@ -317,23 +318,26 @@ static int vesafb_probe(struct platform_device *dev)
 	par = info->par;
 	info->pseudo_palette = par->pseudo_palette;
 
-	par->base = screen_info.lfb_base;
+	par->base = si->lfb_base;
 	par->size = size_total;
 
 	printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
-	       vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
+	       vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel,
+	       vesafb_fix.line_length, si->pages);
 
-	if (screen_info.vesapm_seg) {
+	if (si->vesapm_seg) {
 		printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
-		       screen_info.vesapm_seg,screen_info.vesapm_off);
+		       si->vesapm_seg, si->vesapm_off);
 	}
 
-	if (screen_info.vesapm_seg < 0xc000)
+	if (si->vesapm_seg < 0xc000)
 		ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
 
 	if (ypan || pmi_setpal) {
+		unsigned long pmi_phys;
 		unsigned short *pmi_base;
-		pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
+		pmi_phys  = ((unsigned long)si->vesapm_seg << 4) + si->vesapm_off;
+		pmi_base  = (unsigned short *)phys_to_virt(pmi_phys);
 		pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
 		pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
 		printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
@@ -377,14 +381,14 @@ static int vesafb_probe(struct platform_device *dev)
 	vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
 	vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
 
-	vesafb_defined.red.offset    = screen_info.red_pos;
-	vesafb_defined.red.length    = screen_info.red_size;
-	vesafb_defined.green.offset  = screen_info.green_pos;
-	vesafb_defined.green.length  = screen_info.green_size;
-	vesafb_defined.blue.offset   = screen_info.blue_pos;
-	vesafb_defined.blue.length   = screen_info.blue_size;
-	vesafb_defined.transp.offset = screen_info.rsvd_pos;
-	vesafb_defined.transp.length = screen_info.rsvd_size;
+	vesafb_defined.red.offset    = si->red_pos;
+	vesafb_defined.red.length    = si->red_size;
+	vesafb_defined.green.offset  = si->green_pos;
+	vesafb_defined.green.length  = si->green_size;
+	vesafb_defined.blue.offset   = si->blue_pos;
+	vesafb_defined.blue.length   = si->blue_size;
+	vesafb_defined.transp.offset = si->rsvd_pos;
+	vesafb_defined.transp.length = si->rsvd_size;
 
 	if (vesafb_defined.bits_per_pixel <= 8) {
 		depth = vesafb_defined.green.length;
@@ -399,14 +403,14 @@ static int vesafb_probe(struct platform_device *dev)
 	       (vesafb_defined.bits_per_pixel > 8) ?
 	       "Truecolor" : (vga_compat || pmi_setpal) ?
 	       "Pseudocolor" : "Static Pseudocolor",
-	       screen_info.rsvd_size,
-	       screen_info.red_size,
-	       screen_info.green_size,
-	       screen_info.blue_size,
-	       screen_info.rsvd_pos,
-	       screen_info.red_pos,
-	       screen_info.green_pos,
-	       screen_info.blue_pos);
+	       si->rsvd_size,
+	       si->red_size,
+	       si->green_size,
+	       si->blue_size,
+	       si->rsvd_pos,
+	       si->red_pos,
+	       si->green_pos,
+	       si->blue_pos);
 
 	vesafb_fix.ypanstep  = ypan     ? 1 : 0;
 	vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;