[PATCH 3/3] ALSA: mpu401: Adjust four checks for null pointers

SF Markus Elfring
2017-08-12T19:13:49Z

Date: Sat, 12 Aug 2017 20:50:16 +0200
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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@users.sourceforge.net>
---
sound/drivers/mpu401/mpu401_uart.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c
index e8bdea193eab..b997222274bd 100644
--- a/sound/drivers/mpu401/mpu401_uart.c
+++ b/sound/drivers/mpu401/mpu401_uart.c
@@ -136,7 +136,7 @@ irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id)
{
struct snd_mpu401 *mpu = dev_id;

- if (mpu = NULL)
+ if (!mpu)
return IRQ_NONE;
_snd_mpu401_uart_interrupt(mpu);
return IRQ_HANDLED;
@@ -157,7 +157,7 @@ irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id)
{
struct snd_mpu401 *mpu = dev_id;

- if (mpu = NULL)
+ if (!mpu)
return IRQ_NONE;
uart_interrupt_tx(mpu);
return IRQ_HANDLED;
@@ -544,7 +544,7 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
out_enable, in_enable, &rmidi)) < 0)
return err;
mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
- if (mpu = NULL) {
+ if (!mpu) {
err = -ENOMEM;
goto free_device;
}
@@ -558,7 +558,7 @@ int snd_mpu401_uart_new(struct snd_card *card, int device,
if (! (info_flags & MPU401_INFO_INTEGRATED)) {
int res_size = hardware = MPU401_HW_PC98II ? 4 : 2;
mpu->res = request_region(port, res_size, "MPU401 UART");
- if (mpu->res = NULL) {
+ if (!mpu->res) {
snd_printk(KERN_ERR "mpu401_uart: "
"unable to grab port 0x%lx size %d\n",
port, res_size);
--
2.14.0