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Wed, 17 Nov 2021 05:34:40 -0800 (PST) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id bf17sm5144950oib.27.2021.11.17.05.34.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Nov 2021 05:34:40 -0800 (PST) Date: Wed, 17 Nov 2021 05:34:38 -0800 From: Guenter Roeck To: Sam Protsenko Cc: Wim Van Sebroeck , Rob Herring , Krzysztof Kozlowski , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: Re: [PATCH v3 03/12] watchdog: s3c2410: Fail probe if can't find valid timeout Message-ID: <20211117133438.GC2435591@roeck-us.net> References: <20211107202943.8859-1-semen.protsenko@linaro.org> <20211107202943.8859-4-semen.protsenko@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20211107202943.8859-4-semen.protsenko@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211117_053441_868775_A775500A X-CRM114-Status: GOOD ( 27.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Sun, Nov 07, 2021 at 10:29:34PM +0200, Sam Protsenko wrote: > Driver can't work properly if there no valid timeout was found in > s3c2410wdt_set_heartbeat(). Ideally, that function should be reworked in > a way that it's always able to find some valid timeout. As a temporary > solution let's for now just fail the driver probe in case the valid > timeout can't be found in s3c2410wdt_set_heartbeat() function. > > Signed-off-by: Sam Protsenko > Reported-by: Guenter Roeck > Suggested-by: Guenter Roeck > Reviewed-by: Krzysztof Kozlowski Reviewed-by: Guenter Roeck > --- > Changes in v3: > - Added R-b tag by Krzysztof Kozlowski > > Changes in v2: > - (none): it's a new patch > > drivers/watchdog/s3c2410_wdt.c | 21 ++++++++++----------- > 1 file changed, 10 insertions(+), 11 deletions(-) > > diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c > index 2395f353e52d..00421cf22556 100644 > --- a/drivers/watchdog/s3c2410_wdt.c > +++ b/drivers/watchdog/s3c2410_wdt.c > @@ -515,7 +515,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev) > struct s3c2410_wdt *wdt; > struct resource *wdt_irq; > unsigned int wtcon; > - int started = 0; > int ret; > > wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL); > @@ -581,15 +580,15 @@ static int s3c2410wdt_probe(struct platform_device *pdev) > ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device, > wdt->wdt_device.timeout); > if (ret) { > - started = s3c2410wdt_set_heartbeat(&wdt->wdt_device, > - S3C2410_WATCHDOG_DEFAULT_TIME); > - > - if (started == 0) > - dev_info(dev, > - "tmr_margin value out of range, default %d used\n", > + ret = s3c2410wdt_set_heartbeat(&wdt->wdt_device, > + S3C2410_WATCHDOG_DEFAULT_TIME); > + if (ret == 0) { > + dev_warn(dev, "tmr_margin value out of range, default %d used\n", > S3C2410_WATCHDOG_DEFAULT_TIME); > - else > - dev_info(dev, "default timer value is out of range, cannot start\n"); > + } else { > + dev_err(dev, "failed to use default timeout\n"); > + goto err_cpufreq; > + } > } > > ret = devm_request_irq(dev, wdt_irq->start, s3c2410wdt_irq, 0, > @@ -613,10 +612,10 @@ static int s3c2410wdt_probe(struct platform_device *pdev) > if (ret < 0) > goto err_unregister; > > - if (tmr_atboot && started == 0) { > + if (tmr_atboot) { > dev_info(dev, "starting watchdog timer\n"); > s3c2410wdt_start(&wdt->wdt_device); > - } else if (!tmr_atboot) { > + } else { > /* if we're not enabling the watchdog, then ensure it is > * disabled if it has been left running from the bootloader > * or other source */ > -- > 2.30.2 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel