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[188.155.181.108]) by smtp.gmail.com with ESMTPSA id y14-20020a50eb8e000000b00410a2e7798dsm6893213edr.38.2022.03.01.00.49.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 01 Mar 2022 00:49:36 -0800 (PST) Message-ID: <40d9b2ad-2f8a-42c8-54cf-b22e24d78538@canonical.com> Date: Tue, 1 Mar 2022 09:49:35 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0 Subject: Re: [PATCH v3 01/11] driver: platform: Add helper for safer setting of driver_override Content-Language: en-US To: Bjorn Helgaas Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , Stuart Yoder , Laurentiu Tudor , Abel Vesa , Shawn Guo , Sascha Hauer , Fabio Estevam , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Bjorn Helgaas , Bjorn Andersson , Mathieu Poirier , Vineeth Vijayan , Peter Oberparleiter , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Gross , Srinivas Kandagatla , Mark Brown , "Michael S. Tsirkin" , Jason Wang , linux-kernel@vger.kernel.org, linux-clk@vger.kernel.org, NXP Linux Team , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, linux-arm-msm@vger.kernel.org, alsa-devel@alsa-project.org, linux-spi@vger.kernel.org, virtualization@lists.linux-foundation.org, Linus Torvalds , Rasmus Villemoes References: <20220228200326.GA516164@bhelgaas> From: Krzysztof Kozlowski In-Reply-To: <20220228200326.GA516164@bhelgaas> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28/02/2022 21:03, Bjorn Helgaas wrote: > On Sun, Feb 27, 2022 at 02:52:04PM +0100, Krzysztof Kozlowski wrote: >> Several core drivers and buses expect that driver_override is a >> dynamically allocated memory thus later they can kfree() it. > >> +int driver_set_override(struct device *dev, const char **override, >> + const char *s, size_t len) >> +{ >> + const char *new, *old; >> + char *cp; >> + >> + if (!dev || !override || !s) >> + return -EINVAL; >> + >> + /* We need to keep extra room for a newline */ > > It would help a lot to extend this comment with a hint about where the > room for a newline is needed. It was confusing even before, but it's > much more so now that the check is in a completely different file than > the "show" functions that need the space. > Indeed, this needs explanation. Best regards, Krzysztof