linux-kernel - [PATCH 3/3] pata_macio: Adjust 11 checks for null pointers

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Date:   Fri, 16 Feb 2018 13:40:33 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-ide@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Tejun Heo <tj@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH 3/3] pata_macio: Adjust 11 checks for null pointers

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 16 Feb 2018 13:20:03 +0100
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The script “checkpatch.pl” pointed information out like the following.

Comparison to NULL could be written !…

Thus fix the affected source code places.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/ata/pata_macio.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/ata/pata_macio.c b/drivers/ata/pata_macio.c
index dc40af4c615c..04d546d672c0 100644
--- a/drivers/ata/pata_macio.c
+++ b/drivers/ata/pata_macio.c
@@ -405,23 +405,23 @@ static void pata_macio_set_timings(struct ata_port *ap,
 
 	/* Now get the PIO timings */
 	t = pata_macio_find_timing(priv, adev->pio_mode);
-	if (t == NULL) {
+	if (!t) {
 		dev_warn(priv->dev, "Invalid PIO timing requested: 0x%x\n",
 			 adev->pio_mode);
 		t = pata_macio_find_timing(priv, XFER_PIO_0);
 	}
-	BUG_ON(t == NULL);
+	BUG_ON(!t);
 
 	/* PIO timings only ever use the first treg */
 	priv->treg[adev->devno][0] |= t->reg1;
 
 	/* Now get DMA timings */
 	t = pata_macio_find_timing(priv, adev->dma_mode);
-	if (t == NULL || (t->reg1 == 0 && t->reg2 == 0)) {
+	if (!t || (t->reg1 == 0 && t->reg2 == 0)) {
 		dev_dbg(priv->dev, "DMA timing not set yet, using MW_DMA_0\n");
 		t = pata_macio_find_timing(priv, XFER_MW_DMA_0);
 	}
-	BUG_ON(t == NULL);
+	BUG_ON(!t);
 
 	/* DMA timings can use both tregs */
 	priv->treg[adev->devno][0] |= t->reg1;
@@ -705,7 +705,7 @@ static int pata_macio_port_start(struct ata_port *ap)
 {
 	struct pata_macio_priv *priv = ap->private_data;
 
-	if (ap->ioaddr.bmdma_addr == NULL)
+	if (!ap->ioaddr.bmdma_addr)
 		return 0;
 
 	/* Allocate space for the DBDMA commands.
@@ -717,7 +717,7 @@ static int pata_macio_port_start(struct ata_port *ap)
 		dmam_alloc_coherent(priv->dev,
 				    (MAX_DCMDS + 2) * sizeof(struct dbdma_cmd),
 				    &priv->dma_table_dma, GFP_KERNEL);
-	if (priv->dma_table_cpu == NULL) {
+	if (!priv->dma_table_cpu) {
 		dev_err(priv->dev, "Unable to allocate DMA command list\n");
 		ap->ioaddr.bmdma_addr = NULL;
 		ap->mwdma_mask = 0;
@@ -1055,7 +1055,7 @@ static int pata_macio_common_init(struct pata_macio_priv *priv,
 	pinfo.private_data	= priv;
 
 	priv->host = ata_host_alloc_pinfo(priv->dev, ppi, 1);
-	if (priv->host == NULL) {
+	if (!priv->host) {
 		dev_err(priv->dev, "Failed to allocate ATA port structure\n");
 		return -ENOMEM;
 	}
@@ -1065,7 +1065,7 @@ static int pata_macio_common_init(struct pata_macio_priv *priv,
 
 	/* Map base registers */
 	priv->tfregs = devm_ioremap(priv->dev, tfregs, 0x100);
-	if (priv->tfregs == NULL) {
+	if (!priv->tfregs) {
 		dev_err(priv->dev, "Failed to map ATA ports\n");
 		return -ENOMEM;
 	}
@@ -1075,14 +1075,14 @@ static int pata_macio_common_init(struct pata_macio_priv *priv,
 	if (dmaregs != 0) {
 		dma_regs = devm_ioremap(priv->dev, dmaregs,
 					sizeof(struct dbdma_regs));
-		if (dma_regs == NULL)
+		if (!dma_regs)
 			dev_warn(priv->dev, "Failed to map ATA DMA registers\n");
 	}
 
 	/* If chip has local feature control, map those regs too */
 	if (fcregs != 0) {
 		priv->kauai_fcr = devm_ioremap(priv->dev, fcregs, 4);
-		if (priv->kauai_fcr == NULL) {
+		if (!priv->kauai_fcr) {
 			dev_err(priv->dev, "Failed to map ATA FCR register\n");
 			return -ENOMEM;
 		}
@@ -1258,7 +1258,7 @@ static int pata_macio_pci_attach(struct pci_dev *pdev,
 
 	/* We cannot use a MacIO controller without its OF device node */
 	np = pci_device_to_OF_node(pdev);
-	if (np == NULL) {
+	if (!np) {
 		dev_err(&pdev->dev,
 			"Cannot find OF device node for controller\n");
 		return -ENODEV;
-- 
2.16.1