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Sat, 24 Aug 2024 22:16:47 -0700 (PDT) Received: from dtor-ws.sjc.corp.google.com ([2620:15c:9d:2:66dc:ce07:b7cc:51ea]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7cd9ad55a94sm5622442a12.57.2024.08.24.22.16.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Aug 2024 22:16:47 -0700 (PDT) From: Dmitry Torokhov To: linux-input@vger.kernel.org Cc: Michael Hennerich , Shawn Guo , Sascha Hauer , Fabio Estevam , Laxman Dewangan , Thierry Reding , Hans de Goede , Tony Lindgren , Jeff LaBundy , linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org Subject: [PATCH 07/17] Input: ipaq-micro-keys - use guard notation when acquiring mutex and spinlock Date: Sat, 24 Aug 2024 22:16:11 -0700 Message-ID: <20240825051627.2848495-8-dmitry.torokhov@gmail.com> X-Mailer: git-send-email 2.46.0.295.g3b9ea8a38a-goog In-Reply-To: <20240825051627.2848495-1-dmitry.torokhov@gmail.com> References: <20240825051627.2848495-1-dmitry.torokhov@gmail.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This makes the code more compact and error handling more robust by ensuring that locks are released in all code paths when control leaves critical section. Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/ipaq-micro-keys.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/input/keyboard/ipaq-micro-keys.c b/drivers/input/keyboard/ipaq-micro-keys.c index 1d71dd79ffd2..58631bf7ce55 100644 --- a/drivers/input/keyboard/ipaq-micro-keys.c +++ b/drivers/input/keyboard/ipaq-micro-keys.c @@ -54,18 +54,18 @@ static void micro_key_receive(void *data, int len, unsigned char *msg) static void micro_key_start(struct ipaq_micro_keys *keys) { - spin_lock(&keys->micro->lock); + guard(spinlock)(&keys->micro->lock); + keys->micro->key = micro_key_receive; keys->micro->key_data = keys; - spin_unlock(&keys->micro->lock); } static void micro_key_stop(struct ipaq_micro_keys *keys) { - spin_lock(&keys->micro->lock); + guard(spinlock)(&keys->micro->lock); + keys->micro->key = NULL; keys->micro->key_data = NULL; - spin_unlock(&keys->micro->lock); } static int micro_key_open(struct input_dev *input) @@ -141,13 +141,11 @@ static int micro_key_resume(struct device *dev) struct ipaq_micro_keys *keys = dev_get_drvdata(dev); struct input_dev *input = keys->input; - mutex_lock(&input->mutex); + guard(mutex)(&input->mutex); if (input_device_enabled(input)) micro_key_start(keys); - mutex_unlock(&input->mutex); - return 0; }