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d="scan'208";a="402270489" Received: from lahna.fi.intel.com (HELO lahna) ([10.237.72.163]) by fmsmga001.fm.intel.com with SMTP; 24 Aug 2020 02:15:43 -0700 Received: by lahna (sSMTP sendmail emulation); Mon, 24 Aug 2020 12:15:42 +0300 Date: Mon, 24 Aug 2020 12:15:42 +0300 From: Mika Westerberg To: Arnd Bergmann Subject: Re: [PATCH] mtd: spi-nor: intel-spi: Do not try to make the SPI flash chip writable Message-ID: <20200824091542.GC1375436@lahna.fi.intel.com> References: <20200819065721.GA1375436@lahna.fi.intel.com> <20200819091123.GE1375436@lahna.fi.intel.com> <20200824082227.GU1375436@lahna.fi.intel.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200824_051551_832853_FB3BB6F1 X-CRM114-Status: GOOD ( 27.65 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Hughes , Vignesh Raghavendra , Boris Brezillon , Richard Weinberger , Tudor Ambarus , "linux-kernel@vger.kernel.org" , Greg Kroah-Hartman , linux-mtd , Daniel Gutson , Miquel Raynal , Alex Bazhaniuk Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On Mon, Aug 24, 2020 at 11:08:33AM +0200, Arnd Bergmann wrote: > On Mon, Aug 24, 2020 at 10:22 AM Mika Westerberg > wrote: > > On Sat, Aug 22, 2020 at 06:06:03PM +0200, Arnd Bergmann wrote: > > > On Wed, Aug 19, 2020 at 11:11 AM Mika Westerberg > > > > > > The mtd core just checks both the permissions on the device node (which > > > default to 0600 without any special udev rules) and the MTD_WRITEABLE > > > on the underlying device that is controlled by the module parameter > > > in case of intel-spi{,-platform,-pci}.c. > > > > OK, thanks. > > > > Since we cannot really get rid of the module parameter (AFAIK there are > > users for it), I still think we should just make the "writeable" to > > apply to the PCI part as well. That should at least make it consistent, > > and it also solves Daniel's case. > > Can you explain Daniel's case then? I still don't understand what he > actually wants. > > As I keep repeating, the module parameter *does* apply to the pci > driver front-end since it determines whether the driver will disallow > writes to the mtd device without it. The only difference is that the pci > driver will attempt to set the hardware bit without checking the > module parameter first, while the platform driver does not. If the > module parameter is not set however, the state of the hardware > bit is never checked again. I think Daniel wants the PCI driver not to set the hardware bit by default (same as the platform driver). ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/