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From:   Geert Uytterhoeven <geert+renesas@glider.be>
To:     Pantelis Antoniou <pantelis.antoniou@konsulko.com>,
        Frank Rowand <frowand.list@gmail.com>,
        Rob Herring <robh+dt@kernel.org>
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Geert Uytterhoeven <geert+renesas@glider.be>
Subject: [PATCH 1/2] of: overlay: Move devicetree_corrupt() check up
Date:   Fri, 15 Jul 2022 16:03:14 +0200
Message-Id: <c91ce7112eb5167ea46a43d8a980e76b920010ba.1657893306.git.geert+renesas@glider.be>
In-Reply-To: <cover.1657893306.git.geert+renesas@glider.be>
References: <cover.1657893306.git.geert+renesas@glider.be>
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There is no point in doing several preparatory steps in
of_overlay_fdt_apply(), only to see of_overlay_apply() return early
because of a corrupt device tree.

Move the check for a corrupt device tree from of_overlay_apply() to
of_overlay_fdt_apply(), to check for this as early as possible.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/of/overlay.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
index 4044ddcb02c60a58..84a8d402009cb3b2 100644
--- a/drivers/of/overlay.c
+++ b/drivers/of/overlay.c
@@ -903,12 +903,6 @@ static int of_overlay_apply(struct overlay_changeset *ovcs)
 {
 	int ret = 0, ret_revert, ret_tmp;
 
-	if (devicetree_corrupt()) {
-		pr_err("devicetree state suspect, refuse to apply overlay\n");
-		ret = -EBUSY;
-		goto out;
-	}
-
 	ret = of_resolve_phandles(ovcs->overlay_root);
 	if (ret)
 		goto out;
@@ -983,6 +977,11 @@ int of_overlay_fdt_apply(const void *overlay_fdt, u32 overlay_fdt_size,
 
 	*ret_ovcs_id = 0;
 
+	if (devicetree_corrupt()) {
+		pr_err("devicetree state suspect, refuse to apply overlay\n");
+		return -EBUSY;
+	}
+
 	if (overlay_fdt_size < sizeof(struct fdt_header) ||
 	    fdt_check_header(overlay_fdt)) {
 		pr_err("Invalid overlay_fdt header\n");
-- 
2.25.1