linux-kernel - [PATCH] x86: srat: simplify memory affinity init error handling

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Date:	Tue, 08 Jan 2013 16:18:41 -0800
From:	Davidlohr Bueso <davidlohr.bueso@...com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] x86: srat: simplify memory affinity init error handling

The acpi_numa_memory_affinity_init() function can fail in several
scenarios, use a single point of error return.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@...com>
---
 arch/x86/mm/srat.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/arch/x86/mm/srat.c b/arch/x86/mm/srat.c
index 4ddf497..1100423 100644
--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -149,39 +149,40 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 	int node, pxm;
 
 	if (srat_disabled())
-		return -1;
-	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity)) {
-		bad_srat();
-		return -1;
-	}
+		goto err;
+	if (ma->header.length != sizeof(struct acpi_srat_mem_affinity))
+		goto badsrat;
 	if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
-		return -1;
-
+		goto err;
 	if ((ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) && !save_add_info())
-		return -1;
+		goto err;
+
 	start = ma->base_address;
 	end = start + ma->length;
 	pxm = ma->proximity_domain;
 	if (acpi_srat_revision <= 1)
 		pxm &= 0xff;
+
 	node = setup_node(pxm);
 	if (node < 0) {
 		printk(KERN_ERR "SRAT: Too many proximity domains.\n");
-		bad_srat();
-		return -1;
+		goto badsrat;
 	}
 
-	if (numa_add_memblk(node, start, end) < 0) {
-		bad_srat();
-		return -1;
-	}
+	if (numa_add_memblk(node, start, end) < 0)
+		goto badsrat;
 
 	node_set(node, numa_nodes_parsed);
 
 	printk(KERN_INFO "SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]\n",
 	       node, pxm,
 	       (unsigned long long) start, (unsigned long long) end - 1);
+
 	return 0;
+badsrat:
+	bad_srat();
+err:
+	return -1;
 }
 
 void __init acpi_numa_arch_fixup(void) {}
-- 
1.7.11.7



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