linux-kernel - [PATCH v1 1/3] mux: gpio: Use bitmap API instead of direct assignment

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210326172401.33685-1-andriy.shevchenko@linux.intel.com>
Date:   Fri, 26 Mar 2021 19:23:59 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Cc:     Peter Rosin <peda@...ntia.se>
Subject: [PATCH v1 1/3] mux: gpio: Use bitmap API instead of direct assignment

Assigning bitmaps like it's done in the driver might be error prone.
Fix this by using bitmap API.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/mux/gpio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/mux/gpio.c b/drivers/mux/gpio.c
index 02c1f2c014e8..891ee0274733 100644
--- a/drivers/mux/gpio.c
+++ b/drivers/mux/gpio.c
@@ -6,7 +6,7 @@
  *
  * Author: Peter Rosin <peda@...ntia.se>
  */
-
+#include <linux/bitmap.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/module.h>
@@ -23,8 +23,9 @@ static int mux_gpio_set(struct mux_control *mux, int state)
 {
 	struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
 	DECLARE_BITMAP(values, BITS_PER_TYPE(state));
+	u32 value = state;
 
-	values[0] = state;
+	bitmap_from_arr32(values, &value, BITS_PER_TYPE(value));
 
 	gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
 				       mux_gpio->gpios->desc,
@@ -71,7 +72,7 @@ static int mux_gpio_probe(struct platform_device *pdev)
 		return ret;
 	}
 	WARN_ON(pins != mux_gpio->gpios->ndescs);
-	mux_chip->mux->states = 1 << pins;
+	mux_chip->mux->states = BIT(pins);
 
 	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
 	if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) {
-- 
2.30.2