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Functions like devm_kzalloc, kmalloc_array, devm_ioremap,
usb_alloc_urb, alloc_netdev return NULL as a return value on failure.
Generally, When NULL represents failure, !x is commonly used.
This patch cleans up the tests on the results of these functions, thereby
using !x instead of x == NULL or NULL == x. This is done via following
coccinelle script:
@prob_7@
identifier x;
statement S;
@@
(
x = devm_kzalloc(...);
|
x = usb_alloc_urb(...);
|
x = kmalloc_array(...);
|
x = devm_ioremap(...);
|
x = alloc_netdev(...);
)
...
- if(NULL == x)
+ if(!x)
S
Further we have used isomorphism characteristics of coccinelle to
indicate x == NULL and NULL == x are equivalent. This is done via
following iso script.
Expression
@ is_null @ expression X; @@
X == NULL <=> NULL == X
Signed-off-by: Somya Anand <somyaanand214@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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| .. | ||
| accel | ||
| adc | ||
| addac | ||
| cdc | ||
| Documentation | ||
| frequency | ||
| gyro | ||
| impedance-analyzer | ||
| light | ||
| magnetometer | ||
| meter | ||
| resolver | ||
| trigger | ||
| iio_dummy_evgen.c | ||
| iio_dummy_evgen.h | ||
| iio_simple_dummy_buffer.c | ||
| iio_simple_dummy_events.c | ||
| iio_simple_dummy.c | ||
| iio_simple_dummy.h | ||
| Kconfig | ||
| Makefile | ||
| ring_hw.h | ||
| TODO | ||