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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 <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2011-04-30 15:26:40 +03:00
parent e1d0178901
commit 897044e99e
1 changed files with 61 additions and 34 deletions
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95
drivers/video/omap2/omapfb/omapfb-main.c
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@ -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;
*bpp = 0;
fbi = NULL;
var = NULL;
fbops = NULL;
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;
}
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,