linux-kernel - [PATCH] libata: remove superfluous NULL pointer checks

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Date:	Sun, 26 Jul 2009 16:05:13 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	jgarzik@...ox.com
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Dan Carpenter <error27@...il.com>, corbet@....net,
	eteo@...hat.com
Subject: [PATCH] libata: remove superfluous NULL pointer checks

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] libata: remove superfluous NULL pointer checks

host->ports[] always contain pointers to valid port structures since
a "dummy port" structure is used in case if there is no physical port.

This patch takes care of two entries from Dan's list:

drivers/ata/sata_sil.c +535 sil_interrupt(13) warning: variable derefenced before check 'ap'
drivers/ata/sata_mv.c +2517 mv_unexpected_intr(6) warning: variable derefenced before check 'ap'

and of another needless NULL pointer check in pata_octeon_cf.c.

Reported-by: Dan Carpenter <error27@...il.com>
Cc: corbet@....net
Cc: eteo@...hat.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ata/pata_octeon_cf.c |    3 ++-
 drivers/ata/sata_mv.c        |    2 +-
 drivers/ata/sata_sil.c       |    2 +-
 3 files changed, 4 insertions(+), 3 deletions(-)

Index: b/drivers/ata/pata_octeon_cf.c
===================================================================
--- a/drivers/ata/pata_octeon_cf.c
+++ b/drivers/ata/pata_octeon_cf.c
@@ -653,7 +653,8 @@ static irqreturn_t octeon_cf_interrupt(i
 
 		ap = host->ports[i];
 		ocd = ap->dev->platform_data;
-		if (!ap || (ap->flags & ATA_FLAG_DISABLED))
+
+		if (ap->flags & ATA_FLAG_DISABLED)
 			continue;
 
 		ocd = ap->dev->platform_data;
Index: b/drivers/ata/sata_mv.c
===================================================================
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -2514,7 +2514,7 @@ static void mv_unexpected_intr(struct at
 	char *when = "idle";
 
 	ata_ehi_clear_desc(ehi);
-	if (!ap || (ap->flags & ATA_FLAG_DISABLED)) {
+	if (ap->flags & ATA_FLAG_DISABLED) {
 		when = "disabled";
 	} else if (edma_was_enabled) {
 		when = "EDMA enabled";
Index: b/drivers/ata/sata_sil.c
===================================================================
--- a/drivers/ata/sata_sil.c
+++ b/drivers/ata/sata_sil.c
@@ -532,7 +532,7 @@ static irqreturn_t sil_interrupt(int irq
 		struct ata_port *ap = host->ports[i];
 		u32 bmdma2 = readl(mmio_base + sil_port[ap->port_no].bmdma2);
 
-		if (unlikely(!ap || ap->flags & ATA_FLAG_DISABLED))
+		if (unlikely(ap->flags & ATA_FLAG_DISABLED))
 			continue;
 
 		/* turn off SATA_IRQ if not supported */
--
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