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[v2,1/1] spi: Make error handling of gpiod_count() call cleaner

Message ID 20210420164040.40055-1-andriy.shevchenko@linux.intel.com
State Accepted
Commit 31ed8ebc7a27c1937184b956727bf71d4adc7df3
Headers show
Series [v2,1/1] spi: Make error handling of gpiod_count() call cleaner | expand

Commit Message

Andy Shevchenko April 20, 2021, 4:40 p.m. UTC 
Each time we call spi_get_gpio_descs() the num_chipselect is overwritten
either by new value or by the old one. This is an extra operation in case
gpiod_count() returns an error. Besides that it slashes the error handling
of gpiod_count().

Refactor the code to make error handling of gpiod_count() call cleaner.

Note, that gpiod_count() never returns 0, take this into account as well.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: reformulated commit message and dropped Fixes tag
 drivers/spi/spi.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
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Patch

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 74b2b1dd358b..36c46feab6d4 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2558,13 +2558,14 @@  static int spi_get_gpio_descs(struct spi_controller *ctlr)
 	unsigned int num_cs_gpios = 0;
 
 	nb = gpiod_count(dev, "cs");
-	ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect);
-
-	/* No GPIOs at all is fine, else return the error */
-	if (nb == 0 || nb == -ENOENT)
-		return 0;
-	else if (nb < 0)
+	if (nb < 0) {
+		/* No GPIOs at all is fine, else return the error */
+		if (nb == -ENOENT)
+			return 0;
 		return nb;
+	}
+
+	ctlr->num_chipselect = max_t(int, nb, ctlr->num_chipselect);
 
 	cs = devm_kcalloc(dev, ctlr->num_chipselect, sizeof(*cs),
 			  GFP_KERNEL);