linux-kernel - [PATCH v2 02/11] gpio: Remove redundant check for struct gpio

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

Message-ID: <20260203061059.975605-3-tzungbi@kernel.org>
Date: Tue,  3 Feb 2026 06:10:49 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Linus Walleij <linusw@...nel.org>
Cc: Jonathan Corbet <corbet@....net>,
	Shuah Khan <shuah@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Jason Gunthorpe <jgg@...dia.com>,
	Johan Hovold <johan@...nel.org>,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	chrome-platform@...ts.linux.dev,
	tzungbi@...nel.org,
	Dan Williams <dan.j.williams@...el.com>,
	linux-gpio@...r.kernel.org
Subject: [PATCH v2 02/11] gpio: Remove redundant check for struct gpio_chip

gpiolib_dbg_show() is only called by gpiolib_seq_show() which has
ensured the struct gpio_chip.  Remove the redundant check in
gpiolib_dbg_show().

Signed-off-by: Tzung-Bi Shih <tzungbi@...nel.org>
---
v2:
- No changes.

v1: https://lore.kernel.org/all/20260116081036.352286-8-tzungbi@kernel.org

 drivers/gpio/gpiolib.c | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f51f53511ae3..a6dd07be126c 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -5308,23 +5308,14 @@ core_initcall(gpiolib_dev_init);
 
 #ifdef CONFIG_DEBUG_FS
 
-static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
+static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *gc)
 {
 	bool active_low, is_irq, is_out;
 	struct gpio_desc *desc;
 	unsigned int gpio = 0;
-	struct gpio_chip *gc;
 	unsigned long flags;
 	int value;
 
-	guard(srcu)(&gdev->srcu);
-
-	gc = srcu_dereference(gdev->chip, &gdev->srcu);
-	if (!gc) {
-		seq_puts(s, "Underlying GPIO chip is gone\n");
-		return;
-	}
-
 	for_each_gpio_desc(gc, desc) {
 		guard(srcu)(&desc->gdev->desc_srcu);
 		flags = READ_ONCE(desc->flags);
@@ -5437,7 +5428,7 @@ static int gpiolib_seq_show(struct seq_file *s, void *v)
 	if (gc->dbg_show)
 		gc->dbg_show(s, gc);
 	else
-		gpiolib_dbg_show(s, gdev);
+		gpiolib_dbg_show(s, gc);
 
 	return 0;
 }
-- 
2.53.0.rc2.204.g2597b5adb4-goog