From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9BF9129CB57 for ; Thu, 15 May 2025 12:13:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747311224; cv=none; b=Evl4xS4zfOvHsM4xY/WPpF6dtG9OQHbwdTD0DRK8/f4H+08sECiFd2ZoN+xSxeCWcxRNr1G5DAf2nUYsUChkI/TGOWdd/z+8Tf43/bXtwAmZs1lJ9VSsJwmBzNQunWXqSl1FOLPPRiVHOKvpwB9PV/NHXd6EgJ0ZYZoPwMSryqs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747311224; c=relaxed/simple; bh=SMzCIxMMZEO9396KBs8rN2h+xUSN4fGX3RDCLaGg6m4=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=kLRV0vnVVjwAHK232HbdAZfwa2e5+s02zOyiejCdxoMXlMn+362RVOB3JHm8WcxmxzbtPcCBVTIcqrgnEQ09s9zHfeT+bJmo2la6JCj5cuBLu7YAuU2TQYtyz7s5j1oCmaCLB76YX6voaw8VyOWya10637NxitL/gZHfj9K/ODo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Q/nEksP4; arc=none smtp.client-ip=192.198.163.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="Q/nEksP4" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1747311223; x=1778847223; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=SMzCIxMMZEO9396KBs8rN2h+xUSN4fGX3RDCLaGg6m4=; b=Q/nEksP4GSkatiz0YkufmgnbDu+IrqVsQG+NqE3NZuWkIYMcmCRxrWj2 mlfAmHXXD+DqZyGtek/b2BqwnHpUBx7wdLuDDEFjTL7wqgUkDSNtk3C5t d+aVDpSKSsBHOZjnfQpxO3Jstfjf+sMXDnEdkIgUKEPFsLiQikL4peIll DU+ri6RqxW+OCnMEbZiaYLgE7pUbtwr8faaqjBJb06xqVjdD/LMt+iUcs A98Tf0uU49y6YrFCD+jsv8MSrHzFpF0tF2gwRYnPuUDhmnFt5yJ9/uPCB CL9mtzh74xY/C3bz+hO0kfWu+rPxg7SzLLRkBpom1tAub3azGdJ5NfgKc w==; X-CSE-ConnectionGUID: kRv/SIHmRmKd6RHxOdESiw== X-CSE-MsgGUID: 3H1ZlCboSZS/uUPPhxYECw== X-IronPort-AV: E=McAfee;i="6700,10204,11434"; a="48360738" X-IronPort-AV: E=Sophos;i="6.15,291,1739865600"; d="scan'208";a="48360738" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa113.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 May 2025 05:13:42 -0700 X-CSE-ConnectionGUID: W8qAHBCoTcuDraKKNLsqjA== X-CSE-MsgGUID: k/GCdjmUSmOyXOBwmWmUKA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,291,1739865600"; d="scan'208";a="169290312" Received: from black.fi.intel.com ([10.237.72.28]) by orviesa002.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 May 2025 05:13:37 -0700 Date: Thu, 15 May 2025 15:13:33 +0300 From: Raag Jadav To: "Usyskin, Alexander" Cc: Miquel Raynal , Richard Weinberger , Vignesh Raghavendra , "De Marchi, Lucas" , Thomas =?iso-8859-1?Q?Hellstr=F6m?= , "Vivi, Rodrigo" , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , "Poosa, Karthik" , "Abliyev, Reuven" , "Weil, Oren jer" , "linux-mtd@lists.infradead.org" , "intel-xe@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , "intel-gfx@lists.freedesktop.org" , "linux-kernel@vger.kernel.org" , Tomas Winkler Subject: Re: [PATCH v9 02/12] mtd: add driver for intel graphics non-volatile memory device Message-ID: References: <20250424132536.3043825-1-alexander.usyskin@intel.com> <20250424132536.3043825-3-alexander.usyskin@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, May 15, 2025 at 03:41:08PM +0530, Usyskin, Alexander wrote: > > On Thu, Apr 24, 2025 at 04:25:26PM +0300, Alexander Usyskin wrote: > > > Add auxiliary driver for intel discrete graphics > > > non-volatile memory device. ... > > > + for (n = 0, i = 0; i < INTEL_DG_NVM_REGIONS; i++) { > > > + if (!invm->regions[i].name) > > > + continue; > > > + > > > + name = kasprintf(GFP_KERNEL, "%s.%s", > > > + dev_name(&aux_dev->dev), invm- > > >regions[i].name); > > > + if (!name) > > > + continue; > > > + nvm->regions[n].name = name; > > > + nvm->regions[n].id = i; > > > + n++; > > > + } > > > + nvm->nregions = n; /* in case where kasprintf fail */ > > > > Considering kasprintf failure, should we move forward if n == 0? > Not sure if adding exit path here adds something positive to driver > other than complexity. With an error path already in place it shouldn't be too complex, but upto you. ... > > > +static void intel_dg_mtd_remove(struct auxiliary_device *aux_dev) > > > +{ > > > + struct intel_dg_nvm *nvm = dev_get_drvdata(&aux_dev->dev); > > > + > > > + if (!nvm) > > > + return; > > > > Are we expecting this? > > > > > + dev_set_drvdata(&aux_dev->dev, NULL); > > > > Do we need this? > Is there guaranty by auxiliary device that after release nothing is called? Any reports/link to read about such issues? My understanding is that driver ->remove() callbacks are bus lock held and there won't be an active instance to be called after unbind. Raag