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11 Jul 2023 05:48:00 -0700 Received: from andy by smile.fi.intel.com with local (Exim 4.96) (envelope-from ) id 1qJCmb-001qkh-0z; Tue, 11 Jul 2023 15:47:57 +0300 Date: Tue, 11 Jul 2023 15:47:57 +0300 From: Andy Shevchenko To: Sebastian Reichel Cc: Mark Brown , Cristian Ciocaltea , Yang Yingliang , Amit Kumar Mahapatra via Alsa-devel , Neil Armstrong , Tharun Kumar P , Vijaya Krishna Nivarthi , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-riscv@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-trace-kernel@vger.kernel.org, netdev@vger.kernel.org, Sanjay R Mehta , Radu Pirea , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea , Tudor Ambarus , Serge Semin , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Kevin Hilman , Jerome Brunet , Martin Blumenstingl , Matthias Brugger , AngeloGioacchino Del Regno , Andy Gross , Bjorn Andersson , Konrad Dybcio , Heiko Stuebner , Palmer Dabbelt , Paul Walmsley , Orson Zhai , Baolin Wang , Chunyan Zhang , Alain Volmat , Maxime Coquelin , Alexandre Torgue , Max Filippov , Steven Rostedt , Masami Hiramatsu , Richard Cochran Subject: Re: [PATCH v2 05/15] spi: Remove code duplication in spi_add_device_locked() Message-ID: References: <20230710154932.68377-1-andriy.shevchenko@linux.intel.com> <20230710154932.68377-6-andriy.shevchenko@linux.intel.com> <7557bada-3076-4d6e-a5c5-d368433706e2@sirena.org.uk> <20230711120133.45drgk46y4cz7aut@mercury.elektranox.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230711120133.45drgk46y4cz7aut@mercury.elektranox.org> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo X-MailFrom: andriy.shevchenko@linux.intel.com X-Mailman-Rule-Hits: max-recipients X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-size; news-moderation; no-subject; digests; suspicious-header Message-ID-Hash: IMGWBF4OYGDAFGS3UROHXD4N3PUJ2JGS X-Message-ID-Hash: IMGWBF4OYGDAFGS3UROHXD4N3PUJ2JGS X-Mailman-Approved-At: Tue, 11 Jul 2023 14:22:03 +0000 X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Tue, Jul 11, 2023 at 02:01:33PM +0200, Sebastian Reichel wrote: > On Tue, Jul 11, 2023 at 02:06:20PM +0300, Andy Shevchenko wrote: > > On Mon, Jul 10, 2023 at 06:16:22PM +0100, Mark Brown wrote: > > > On Mon, Jul 10, 2023 at 06:49:22PM +0300, Andy Shevchenko wrote: ... > > > > - struct device *dev = ctlr->dev.parent; > > > > - > > > > - /* Chipselects are numbered 0..max; validate. */ > > > > - if (spi_get_chipselect(spi, 0) >= ctlr->num_chipselect) { > > > > - dev_err(dev, "cs%d >= max %d\n", spi_get_chipselect(spi, 0), > > > > - ctlr->num_chipselect); > > > > - return -EINVAL; > > > > - } > > > > - > > > > - /* Set the bus ID string */ > > > > - spi_dev_set_name(spi); > > > > > > I see that this is duplicating spi_add_device() (and we really could do > > > better with code sharing there I think) but I can't immediately see > > > where the duplication that's intended to be elimiated is here - where > > > else in the one call path that spi_add_device_locked() has would we do > > > the above? Based on the changelog I was expecting to see some > > > duplicated code in the function itself. > > > > Oh, by some reason Sebastian wasn't in this rather long Cc list. > > Added him. > > > > Reading again I don't see any useful explanation why that piece of code has to > > be duplicated among these two functions. It's 100% a copy. > > > > Sebastian, can you shed some light here? > > The patch in this thread is obviously wrong. It results in the > checks never beeing called for spi_add_device_locked(). The copy is > in spi_add_device() and those two are not calling into each other. Ah, now I see, I missed __ in the name. Thank you for opening my eyes! > But it should be fine to move the code to the start of > __spi_add_device(), which allows removing the duplication. In that > case the code will be run with the add_lock held, which is probably > what I was worried about two years ago. Looking at it again, the > lock is held anyways in case of spi_add_device_locked(). Right, I will re-do that. -- With Best Regards, Andy Shevchenko