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Sat, 24 Aug 2024 22:16:59 -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 41be03b00d2f7-7cd9ad55a94sm5622442a12.57.2024.08.24.22.16.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 24 Aug 2024 22:16:59 -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 16/17] Input: st-keyscan - use guard notation when acquiring mutex Date: Sat, 24 Aug 2024 22:16:20 -0700 Message-ID: <20240825051627.2848495-17-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 mutexes are released in all code paths when control leaves critical section. Signed-off-by: Dmitry Torokhov --- drivers/input/keyboard/st-keyscan.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/drivers/input/keyboard/st-keyscan.c b/drivers/input/keyboard/st-keyscan.c index 0d27324af809..e53ef4c670e4 100644 --- a/drivers/input/keyboard/st-keyscan.c +++ b/drivers/input/keyboard/st-keyscan.c @@ -216,14 +216,13 @@ static int keyscan_suspend(struct device *dev) struct st_keyscan *keypad = platform_get_drvdata(pdev); struct input_dev *input = keypad->input_dev; - mutex_lock(&input->mutex); + guard(mutex)(&input->mutex); if (device_may_wakeup(dev)) enable_irq_wake(keypad->irq); else if (input_device_enabled(input)) keyscan_stop(keypad); - mutex_unlock(&input->mutex); return 0; } @@ -232,17 +231,19 @@ static int keyscan_resume(struct device *dev) struct platform_device *pdev = to_platform_device(dev); struct st_keyscan *keypad = platform_get_drvdata(pdev); struct input_dev *input = keypad->input_dev; - int retval = 0; + int error; - mutex_lock(&input->mutex); + guard(mutex)(&input->mutex); - if (device_may_wakeup(dev)) + if (device_may_wakeup(dev)) { disable_irq_wake(keypad->irq); - else if (input_device_enabled(input)) - retval = keyscan_start(keypad); + } else if (input_device_enabled(input)) { + error = keyscan_start(keypad); + if (error) + return error; + } - mutex_unlock(&input->mutex); - return retval; + return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(keyscan_dev_pm_ops,