[PATCH 2/2] atmel_lcdfb: Disallow to set larger resolution than framebuffer memory can handle

[Stanislaw Gruszka <stf_xl@wp.pl>]

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
CC: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 drivers/video/atmel_lcdfb.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c
index 3376f35..5d6cf33 100644
--- a/drivers/video/atmel_lcdfb.c
+++ b/drivers/video/atmel_lcdfb.c
@@ -342,6 +342,13 @@ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var,
 	var->transp.offset = var->transp.length = 0;
 	var->xoffset = var->yoffset = 0;
 
+	if (info->fix.smem_len) {
+		unsigned int smem_len = (var->xres_virtual * var->yres_virtual
+					 * ((var->bits_per_pixel + 7) / 8));
+		if (smem_len > info->fix.smem_len)
+			return -EINVAL;
+	}
+
 	/* Saturate vertical and horizontal timings at maximum values */
 	var->vsync_len = min_t(u32, var->vsync_len,
 			(ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1);
-- 
1.5.2.5


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