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Date: Wed, 17 May 2017 13:55:31 +0200
From: SF Markus Elfring <elfring@...rs.sourceforge.net>
To: linux-spi@...r.kernel.org, Mark Brown <broonie@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2] spi-bfin5xx: Adjust 14 checks for null pointers
From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 17 May 2017 13:13:26 +0200
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 affected source code places.
Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
drivers/spi/spi-bfin5xx.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/drivers/spi/spi-bfin5xx.c b/drivers/spi/spi-bfin5xx.c
index 3265f4967d2b..c1353ac49c9c 100644
--- a/drivers/spi/spi-bfin5xx.c
+++ b/drivers/spi/spi-bfin5xx.c
@@ -489,7 +489,7 @@ static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id)
"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
dmastat, spistat);
- if (drv_data->rx != NULL) {
+ if (drv_data->rx) {
u16 cr = bfin_read(&drv_data->regs->ctl);
/* discard old RX data and clear RXS */
bfin_spi_dummy_read(drv_data);
@@ -506,7 +506,7 @@ static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id)
* to be transmitted ... software needs to poll TXS in the SPI_STAT
* register until it goes low for 2 successive reads
*/
- if (drv_data->tx != NULL) {
+ if (drv_data->tx) {
while ((bfin_read(&drv_data->regs->stat) & BIT_STAT_TXS) ||
(bfin_read(&drv_data->regs->stat) & BIT_STAT_TXS))
cpu_relax();
@@ -612,7 +612,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
return;
}
- if (transfer->tx_buf != NULL) {
+ if (transfer->tx_buf) {
drv_data->tx = (void *)transfer->tx_buf;
drv_data->tx_end = drv_data->tx + transfer->len;
dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n",
@@ -621,7 +621,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
drv_data->tx = NULL;
}
- if (transfer->rx_buf != NULL) {
+ if (transfer->rx_buf) {
full_duplex = transfer->tx_buf != NULL;
drv_data->rx = transfer->rx_buf;
drv_data->rx_end = drv_data->rx + transfer->len;
@@ -723,7 +723,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
/* In dma mode, rx or tx must be NULL in one transfer */
dma_config = (RESTART | dma_width | DI_EN);
- if (drv_data->rx != NULL) {
+ if (drv_data->rx) {
/* set transfer mode, and enable SPI */
dev_dbg(&drv_data->pdev->dev, "doing DMA in to %p (size %zx)\n",
drv_data->rx, drv_data->len_in_bytes);
@@ -738,7 +738,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
dma_start_addr = (unsigned long)drv_data->rx;
cr |= BIT_CTL_TIMOD_DMA_RX | BIT_CTL_SENDOPT;
- } else if (drv_data->tx != NULL) {
+ } else if (drv_data->tx) {
dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
/* flush caches, if needed */
@@ -789,7 +789,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
bfin_spi_dummy_read(drv_data);
/* start transfer */
- if (drv_data->tx == NULL)
+ if (!drv_data->tx)
bfin_write(&drv_data->regs->tdbr, chip->idle_tx_val);
else {
int loop;
@@ -827,7 +827,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
if (drv_data->tx != drv_data->tx_end)
tranf_success = 0;
- } else if (drv_data->tx != NULL) {
+ } else if (drv_data->tx) {
/* write only half duplex */
dev_dbg(&drv_data->pdev->dev,
"IO write: cr is 0x%x\n", cr);
@@ -836,7 +836,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
if (drv_data->tx != drv_data->tx_end)
tranf_success = 0;
- } else if (drv_data->rx != NULL) {
+ } else if (drv_data->rx) {
/* read only half duplex */
dev_dbg(&drv_data->pdev->dev,
"IO read: cr is 0x%x\n", cr);
@@ -979,6 +979,6 @@ static int bfin_spi_setup(struct spi_device *spi)
/* Only alloc (or use chip_info) on first setup */
chip_info = NULL;
chip = spi_get_ctldata(spi);
- if (chip == NULL) {
+ if (!chip) {
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip) {
@@ -1086,7 +1086,7 @@ static int bfin_spi_setup(struct spi_device *spi)
if (chip->chip_select_num >= MAX_CTRL_CS) {
/* Only request on first setup */
- if (spi_get_ctldata(spi) == NULL) {
+ if (!spi_get_ctldata(spi)) {
ret = gpio_request(chip->cs_gpio, spi->modalias);
if (ret) {
dev_err(&spi->dev, "gpio_request() error\n");
@@ -1278,21 +1278,21 @@ static int bfin_spi_probe(struct platform_device *pdev)
/* Find and map our resources */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL) {
+ if (!res) {
dev_err(dev, "Cannot get IORESOURCE_MEM\n");
status = -ENOENT;
goto out_error_get_res;
}
drv_data->regs = ioremap(res->start, resource_size(res));
- if (drv_data->regs == NULL) {
+ if (!drv_data->regs) {
dev_err(dev, "Cannot map IO\n");
status = -ENXIO;
goto out_error_ioremap;
}
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (res == NULL) {
+ if (!res) {
dev_err(dev, "No DMA channel specified\n");
status = -ENOENT;
goto out_error_free_io;
--
2.13.0
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