From 897044e99e437e908eef566d910692830546c2d9 Mon Sep 17 00:00:00 2001 From: Tomi Valkeinen Date: Sat, 30 Apr 2011 15:26:40 +0300 Subject: OMAP: DSS2: OMAPFB: Reduce stack usage omapfb_mode_to_timings() had struct fb_info, struct fb_var and struct fb_ops allocated from stack. This caused the stack usage grow quite high. Use kzalloc to allocate the structs instead. Signed-off-by: Tomi Valkeinen --- drivers/video/omap2/omapfb/omapfb-main.c | 95 ++++++++++++++++++++------------ 1 file changed, 61 insertions(+), 34 deletions(-) (limited to 'drivers/video/omap2') diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c index 9a5b4bc81c80..505bc12a3031 100644 --- a/drivers/video/omap2/omapfb/omapfb-main.c +++ b/drivers/video/omap2/omapfb/omapfb-main.c @@ -1996,9 +1996,9 @@ static int omapfb_create_framebuffers(struct omapfb2_device *fbdev) static int omapfb_mode_to_timings(const char *mode_str, struct omap_video_timings *timings, u8 *bpp) { - struct fb_info fbi; - struct fb_var_screeninfo var; - struct fb_ops fbops; + struct fb_info *fbi; + struct fb_var_screeninfo *var; + struct fb_ops *fbops; int r; #ifdef CONFIG_OMAP2_DSS_VENC @@ -2016,39 +2016,66 @@ static int omapfb_mode_to_timings(const char *mode_str, /* this is quite a hack, but I wanted to use the modedb and for * that we need fb_info and var, so we create dummy ones */ - memset(&fbi, 0, sizeof(fbi)); - memset(&var, 0, sizeof(var)); - memset(&fbops, 0, sizeof(fbops)); - fbi.fbops = &fbops; - - r = fb_find_mode(&var, &fbi, mode_str, NULL, 0, NULL, 24); - - if (r != 0) { - timings->pixel_clock = PICOS2KHZ(var.pixclock); - timings->hbp = var.left_margin; - timings->hfp = var.right_margin; - timings->vbp = var.upper_margin; - timings->vfp = var.lower_margin; - timings->hsw = var.hsync_len; - timings->vsw = var.vsync_len; - timings->x_res = var.xres; - timings->y_res = var.yres; - - switch (var.bits_per_pixel) { - case 16: - *bpp = 16; - break; - case 24: - case 32: - default: - *bpp = 24; - break; - } + *bpp = 0; + fbi = NULL; + var = NULL; + fbops = NULL; - return 0; - } else { - return -EINVAL; + fbi = kzalloc(sizeof(*fbi), GFP_KERNEL); + if (fbi == NULL) { + r = -ENOMEM; + goto err; + } + + var = kzalloc(sizeof(*var), GFP_KERNEL); + if (var == NULL) { + r = -ENOMEM; + goto err; + } + + fbops = kzalloc(sizeof(*fbops), GFP_KERNEL); + if (fbops == NULL) { + r = -ENOMEM; + goto err; + } + + fbi->fbops = fbops; + + r = fb_find_mode(var, fbi, mode_str, NULL, 0, NULL, 24); + if (r == 0) { + r = -EINVAL; + goto err; } + + timings->pixel_clock = PICOS2KHZ(var->pixclock); + timings->hbp = var->left_margin; + timings->hfp = var->right_margin; + timings->vbp = var->upper_margin; + timings->vfp = var->lower_margin; + timings->hsw = var->hsync_len; + timings->vsw = var->vsync_len; + timings->x_res = var->xres; + timings->y_res = var->yres; + + switch (var->bits_per_pixel) { + case 16: + *bpp = 16; + break; + case 24: + case 32: + default: + *bpp = 24; + break; + } + + r = 0; + +err: + kfree(fbi); + kfree(var); + kfree(fbops); + + return r; } static int omapfb_set_def_mode(struct omapfb2_device *fbdev, -- cgit v1.2.3