linux-kernel - [PATCH 3/5] resources: Print warning when inserting resource [mem 0x00000000]

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Message-Id: <1352343356-4006-4-git-send-email-peter@hurleysoftware.com>
Date:	Wed,  7 Nov 2012 21:55:54 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 3/5] resources: Print warning when inserting resource [mem 0x00000000]

Inserting iomem resource [0x0-0x0] is most likely a bug; at least
print a warning message. Eg.,
  resource: inserting NULL resource iTCO_wdt [mem 0x00000000]

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 kernel/resource.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/resource.c b/kernel/resource.c
index 268b5fa..ab758bb 100644
--- a/kernel/resource.c
+++ b/kernel/resource.c
@@ -589,6 +589,9 @@ static struct resource * __insert_resource(struct resource *parent, struct resou
 {
 	struct resource *first, *next;
 
+	if (new->flags & IORESOURCE_MEM && !new->start && !new->end)
+		pr_warn("inserting NULL resource %s %pR", new->name, new);
+
 	for (;; parent = first) {
 		first = __request_resource(parent, new);
 		if (!first)
-- 
1.7.12.3

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