linux-kernel - [PATCH 10/12] ACPI: processor: refactor internal map_lsapic

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Message-ID: <20100125214129.28510.72412.stgit@bob.kio>
Date:	Mon, 25 Jan 2010 14:41:29 -0700
From:	Alex Chiang <achiang@...com>
To:	lenb@...nel.org
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 10/12] ACPI: processor: refactor internal map_lsapic_id()

Un-nest the if statements for readability.

Remove comments that re-state the obvious.

Change the control flow so that we no longer need a temp variable.

Signed-off-by: Alex Chiang <achiang@...com>
---

 drivers/acpi/processor_core.c |   20 +++++---------------
 1 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 9213f95..ec5989c 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -83,27 +83,17 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
 {
 	struct acpi_madt_local_sapic *lsapic =
 		(struct acpi_madt_local_sapic *)entry;
-	u32 tmp = (lsapic->id << 8) | lsapic->eid;
 
-	/* Only check enabled APICs*/
 	if (!(lsapic->lapic_flags & ACPI_MADT_ENABLED))
 		return 0;
 
-	/* Device statement declaration type */
 	if (device_declaration) {
-		if (entry->length < 16)
-			printk(KERN_ERR PREFIX
-			    "Invalid LSAPIC with Device type processor (SAPIC ID %#x)\n",
-			    tmp);
-		else if (lsapic->uid == acpi_id)
-			goto found;
-	/* Processor statement declaration type */
-	} else if (lsapic->processor_id == acpi_id)
-		goto found;
+		if ((entry->length < 16) || (lsapic->uid != acpi_id))
+			return 0;
+	} else if (lsapic->processor_id != acpi_id)
+		return 0;
 
-	return 0;
-found:
-	*apic_id = tmp;
+	*apic_id = (lsapic->id << 8) | lsapic->eid;
 	return 1;
 }
 

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