linux-kernel - [PATCH 5.4 243/244] Revert "of/fdt: Make sure no-map does not remove already reserved regions"

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Date:   Wed, 12 May 2021 16:50:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alexandre TORGUE <alexandre.torgue@...s.st.com>,
        Quentin Perret <qperret@...gle.com>
Subject: [PATCH 5.4 243/244] Revert "of/fdt: Make sure no-map does not remove already reserved regions"

From: Quentin Perret <qperret@...gle.com>

This reverts commit 3cbd3038c9155038020560729cde50588311105d.
It is not really a fix, and the backport misses dependencies, which
breaks existing platforms.

Reported-by: Alexandre TORGUE <alexandre.torgue@...s.st.com>
Signed-off-by: Quentin Perret <qperret@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/of/fdt.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1153,16 +1153,8 @@ int __init __weak early_init_dt_mark_hot
 int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base,
 					phys_addr_t size, bool nomap)
 {
-	if (nomap) {
-		/*
-		 * If the memory is already reserved (by another region), we
-		 * should not allow it to be marked nomap.
-		 */
-		if (memblock_is_region_reserved(base, size))
-			return -EBUSY;
-
+	if (nomap)
 		return memblock_mark_nomap(base, size);
-	}
 	return memblock_reserve(base, size);
 }