From: Philipp Zabel <p.zabel@pengutronix.de>
Date: Mon, 6 Feb 2017 11:39:01 +0000 (+0100)
Subject: gpu: ipu-cpmem: set image base address even for incorrect formats
X-Git-Tag: v4.12-rc1~116^2~29^2~19
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5cd4337135f5d79bf655fa421980e467d76ba125;p=karo-tx-linux.git

gpu: ipu-cpmem: set image base address even for incorrect formats

Otherwise, if the image base address is kept at zero, and if the user
ignores the error return value, the IPU may be configured to write into
the dma-apbh@00110000 region for large frames, which will lock up the
system.

Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---

diff --git a/drivers/gpu/ipu-v3/ipu-cpmem.c b/drivers/gpu/ipu-v3/ipu-cpmem.c
index 4b2b67113d92..f29aa7b0853c 100644
--- a/drivers/gpu/ipu-v3/ipu-cpmem.c
+++ b/drivers/gpu/ipu-v3/ipu-cpmem.c
@@ -644,6 +644,7 @@ int ipu_cpmem_set_image(struct ipuv3_channel *ch, struct ipu_image *image)
 {
 	struct v4l2_pix_format *pix = &image->pix;
 	int offset, u_offset, v_offset;
+	int ret = 0;
 
 	pr_debug("%s: resolution: %dx%d stride: %d\n",
 		 __func__, pix->width, pix->height,
@@ -720,13 +721,16 @@ int ipu_cpmem_set_image(struct ipuv3_channel *ch, struct ipu_image *image)
 			image->rect.top * pix->bytesperline;
 		break;
 	default:
-		return -EINVAL;
+		/* This should not happen */
+		WARN_ON(1);
+		offset = 0;
+		ret = -EINVAL;
 	}
 
 	ipu_cpmem_set_buffer(ch, 0, image->phys0 + offset);
 	ipu_cpmem_set_buffer(ch, 1, image->phys1 + offset);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL_GPL(ipu_cpmem_set_image);