From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>,
linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Linus Walleij <linus.walleij@linaro.org>,
Bartosz Golaszewski <brgl@bgdev.pl>
Subject: [PATCH v1 2/2] gpiolib: Check array_info for NULL only once in gpiod_get_array()
Date: Tue, 21 Mar 2023 15:54:12 +0200 [thread overview]
Message-ID: <20230321135412.73240-2-andriy.shevchenko@linux.intel.com> (raw)
In-Reply-To: <20230321135412.73240-1-andriy.shevchenko@linux.intel.com>
gpiod_get_array() has a long if-else-if branching where each of them
tests for the same variable to be not NULL. Instead, check for NULL
before even going to that flow.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/gpio/gpiolib.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 3e94990f1f90..ee24428c5fe3 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -4294,7 +4294,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
if (!descs)
return ERR_PTR(-ENOMEM);
- for (descs->ndescs = 0; descs->ndescs < count; ) {
+ for (descs->ndescs = 0; descs->ndescs < count; descs->ndescs++) {
desc = gpiod_get_index(dev, con_id, descs->ndescs, flags);
if (IS_ERR(desc)) {
gpiod_put_array(descs);
@@ -4339,8 +4339,13 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
count - descs->ndescs);
descs->info = array_info;
}
+
+ /* If there is no cache for fast bitmap processing path, continue */
+ if (!array_info)
+ continue;
+
/* Unmark array members which don't belong to the 'fast' chip */
- if (array_info && array_info->chip != gc) {
+ if (array_info->chip != gc) {
__clear_bit(descs->ndescs, array_info->get_mask);
__clear_bit(descs->ndescs, array_info->set_mask);
}
@@ -4348,8 +4353,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
* Detect array members which belong to the 'fast' chip
* but their pins are not in hardware order.
*/
- else if (array_info &&
- gpio_chip_hwgpio(desc) != descs->ndescs) {
+ else if (gpio_chip_hwgpio(desc) != descs->ndescs) {
/*
* Don't use fast path if all array members processed so
* far belong to the same chip as this one but its pin
@@ -4363,7 +4367,7 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
__clear_bit(descs->ndescs,
array_info->set_mask);
}
- } else if (array_info) {
+ } else {
/* Exclude open drain or open source from fast output */
if (gpiochip_line_is_open_drain(gc, descs->ndescs) ||
gpiochip_line_is_open_source(gc, descs->ndescs))
@@ -4374,8 +4378,6 @@ struct gpio_descs *__must_check gpiod_get_array(struct device *dev,
__set_bit(descs->ndescs,
array_info->invert_mask);
}
-
- descs->ndescs++;
}
if (array_info)
dev_dbg(dev,
--
2.40.0.1.gaa8946217a0b
next prev parent reply other threads:[~2023-03-21 13:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-21 13:54 [PATCH v1 1/2] gpiolib: Replace open coded krealloc() Andy Shevchenko
2023-03-21 13:54 ` Andy Shevchenko [this message]
2023-03-23 8:18 ` [PATCH v1 2/2] gpiolib: Check array_info for NULL only once in gpiod_get_array() Linus Walleij
2023-03-23 8:17 ` [PATCH v1 1/2] gpiolib: Replace open coded krealloc() Linus Walleij
2023-03-29 16:12 ` Bartosz Golaszewski
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