From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A704AC433EF for ; Fri, 10 Dec 2021 13:25:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238389AbhLJN3P (ORCPT ); Fri, 10 Dec 2021 08:29:15 -0500 Received: from first.geanix.com ([116.203.34.67]:37698 "EHLO first.geanix.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229596AbhLJN3O (ORCPT ); Fri, 10 Dec 2021 08:29:14 -0500 Received: from skn-laptop.hadsten (_gateway [172.25.0.1]) by first.geanix.com (Postfix) with ESMTPSA id 0DF63E1224; Fri, 10 Dec 2021 13:25:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=geanix.com; s=first; t=1639142737; bh=GS8nU28XmAGY8uEhKtpj+mHtxIDS2aSZaH47P+RuMJ4=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=l9aCZX+bT6fxe3ElrjeFqc+E+iSt2XqqfELu8zGEtMhY8JSJVBFVvlS9J0+yfQh9q mBYh6QJo3//RbMnXcAsXOJPy+LoHDGelJjjyfLMArvIIltuVgubTfXnqKOE5IhWLBL zikACI90jrcIL2Zxwwvft2o1H+z8p8iC5i6+LXdTDK5vUfvaU772xDvGX5F91oXNN7 jxhLAtIXIMoBU/lDOrLcrU/SXDoicFGqaobSR2ycpvUJlfIuz7KhXCWcK89HmY/f/a fbGktDk6T0CWpGUqYXCwd93XTirEZOm07sXHQ2iro5XZCA9syIvtH6QIbfkMUSZRi2 NiTh+5RvG/VTg== Date: Fri, 10 Dec 2021 14:25:35 +0100 From: Sean Nyekjaer To: Miquel Raynal Cc: Boris Brezillon , linux-kernel@vger.kernel.org, Marek Szyprowski , Richard Weinberger , Vignesh Raghavendra , Boris Brezillon , linux-mtd@lists.infradead.org Subject: Re: [PATCH v5 3/4] mtd: core: protect access to MTD devices while in suspend Message-ID: <20211210132535.gy7rqj5zblqlnz5y@skn-laptop.hadsten> References: <20211129101908.6f1aa715@xps13> <20211129094129.xn364czofrgtvfb4@skn-laptop> <63be9121-18c3-1ef2-c448-f99fb861490f@samsung.com> <20211130124131.6pgu7enjgk6y536m@skn-laptop> <20211130141551.400331c8@collabora.com> <20211130132912.v6v45boce2zbnoy3@skn-laptop> <20211130143705.5d0404aa@collabora.com> <20211203143958.40645506@xps13> <20211209140721.6ki7gznvxwyn3cze@skn-laptop.hinnerup> <20211209152811.318bdf17@xps13> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20211209152811.318bdf17@xps13> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 09, 2021 at 03:28:11PM +0100, Miquel Raynal wrote: > Hi Sean, > > sean@geanix.com wrote on Thu, 9 Dec 2021 15:07:21 +0100: > > > On Fri, Dec 03, 2021 at 02:39:58PM +0100, Miquel Raynal wrote: > > > Hello, > > > > > > > > Fine by me, lets drop this series. > > > > > > FYI I've dropped the entire series from mtd/next. I'm waiting for the > > > fix discussed below (without abusing the chip mutex ;-) ). > > > > Cool, looking forward to test a patch series :) > > Test? You mean "write"? :) > > Cheers, > Miquèl Hi Miquel, Should we us a atomic for the suspended variable? /Sean diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c index b3a9bc08b4bb..eb4ec9a42d49 100644 --- a/drivers/mtd/nand/raw/nand_base.c +++ b/drivers/mtd/nand/raw/nand_base.c @@ -338,16 +338,19 @@ static int nand_isbad_bbm(struct nand_chip *chip, loff_t ofs) * * Return: -EBUSY if the chip has been suspended, 0 otherwise */ -static int nand_get_device(struct nand_chip *chip) +static void nand_get_device(struct nand_chip *chip) { - mutex_lock(&chip->lock); - if (chip->suspended) { + /* Wait until the device is resumed. */ + while (1) { + mutex_lock(&chip->lock); + if (!chip->suspended) { + mutex_lock(&chip->controller->lock); + return; + } mutex_unlock(&chip->lock); - return -EBUSY; - } - mutex_lock(&chip->controller->lock); - return 0; + wait_event(chip->resume_wq, !chip->suspended); + } } /** @@ -576,9 +579,7 @@ static int nand_block_markbad_lowlevel(struct nand_chip *chip, loff_t ofs) nand_erase_nand(chip, &einfo, 0); /* Write bad block marker to OOB */ - ret = nand_get_device(chip); - if (ret) - return ret; + nand_get_device(chip); ret = nand_markbad_bbm(chip, ofs); nand_release_device(chip); @@ -3759,9 +3760,7 @@ static int nand_read_oob(struct mtd_info *mtd, loff_t from, ops->mode != MTD_OPS_RAW) return -ENOTSUPP; - ret = nand_get_device(chip); - if (ret) - return ret; + nand_get_device(chip); if (!ops->datbuf) ret = nand_do_read_oob(chip, from, ops); @@ -4352,9 +4351,7 @@ static int nand_write_oob(struct mtd_info *mtd, loff_t to, ops->retlen = 0; - ret = nand_get_device(chip); - if (ret) - return ret; + nand_get_device(chip); switch (ops->mode) { case MTD_OPS_PLACE_OOB: @@ -4414,9 +4411,7 @@ int nand_erase_nand(struct nand_chip *chip, struct erase_info *instr, return -EIO; /* Grab the lock and see if the device is available */ - ret = nand_get_device(chip); - if (ret) - return ret; + nand_get_device(chip); /* Shift to get first page */ page = (int)(instr->addr >> chip->page_shift); @@ -4503,7 +4498,7 @@ static void nand_sync(struct mtd_info *mtd) pr_debug("%s: called\n", __func__); /* Grab the lock and see if the device is available */ - WARN_ON(nand_get_device(chip)); + nand_get_device(chip); /* Release it and go back */ nand_release_device(chip); } @@ -4520,9 +4515,7 @@ static int nand_block_isbad(struct mtd_info *mtd, loff_t offs) int ret; /* Select the NAND device */ - ret = nand_get_device(chip); - if (ret) - return ret; + nand_get_device(chip); nand_select_target(chip, chipnr); @@ -4593,6 +4586,8 @@ static void nand_resume(struct mtd_info *mtd) __func__); } mutex_unlock(&chip->lock); + + wake_up_all(&chip->resume_wq); } /** @@ -5370,6 +5365,7 @@ static int nand_scan_ident(struct nand_chip *chip, unsigned int maxchips, chip->cur_cs = -1; mutex_init(&chip->lock); + init_waitqueue_head(&chip->resume_wq); /* Enforce the right timings for reset/detection */ chip->current_interface_config = nand_get_reset_interface_config(); diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index b2f9dd3cbd69..248054560581 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -1294,6 +1294,7 @@ struct nand_chip { /* Internals */ struct mutex lock; unsigned int suspended : 1; + wait_queue_head_t resume_wq; int cur_cs; int read_retries; struct nand_secure_region *secure_regions; From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 03314C433F5 for ; Fri, 10 Dec 2021 13:26:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; 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bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvfu8-001xBk-VN for linux-mtd@lists.infradead.org; Fri, 10 Dec 2021 13:25:43 +0000 Received: from skn-laptop.hadsten (_gateway [172.25.0.1]) by first.geanix.com (Postfix) with ESMTPSA id 0DF63E1224; Fri, 10 Dec 2021 13:25:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=geanix.com; s=first; t=1639142737; bh=GS8nU28XmAGY8uEhKtpj+mHtxIDS2aSZaH47P+RuMJ4=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=l9aCZX+bT6fxe3ElrjeFqc+E+iSt2XqqfELu8zGEtMhY8JSJVBFVvlS9J0+yfQh9q mBYh6QJo3//RbMnXcAsXOJPy+LoHDGelJjjyfLMArvIIltuVgubTfXnqKOE5IhWLBL zikACI90jrcIL2Zxwwvft2o1H+z8p8iC5i6+LXdTDK5vUfvaU772xDvGX5F91oXNN7 jxhLAtIXIMoBU/lDOrLcrU/SXDoicFGqaobSR2ycpvUJlfIuz7KhXCWcK89HmY/f/a fbGktDk6T0CWpGUqYXCwd93XTirEZOm07sXHQ2iro5XZCA9syIvtH6QIbfkMUSZRi2 NiTh+5RvG/VTg== Date: Fri, 10 Dec 2021 14:25:35 +0100 From: Sean Nyekjaer To: Miquel Raynal Cc: Boris Brezillon , linux-kernel@vger.kernel.org, Marek Szyprowski , Richard Weinberger , Vignesh Raghavendra , Boris Brezillon , linux-mtd@lists.infradead.org Subject: Re: [PATCH v5 3/4] mtd: core: protect access to MTD devices while in suspend Message-ID: <20211210132535.gy7rqj5zblqlnz5y@skn-laptop.hadsten> References: <20211129101908.6f1aa715@xps13> <20211129094129.xn364czofrgtvfb4@skn-laptop> <63be9121-18c3-1ef2-c448-f99fb861490f@samsung.com> <20211130124131.6pgu7enjgk6y536m@skn-laptop> <20211130141551.400331c8@collabora.com> <20211130132912.v6v45boce2zbnoy3@skn-laptop> <20211130143705.5d0404aa@collabora.com> <20211203143958.40645506@xps13> <20211209140721.6ki7gznvxwyn3cze@skn-laptop.hinnerup> <20211209152811.318bdf17@xps13> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20211209152811.318bdf17@xps13> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211210_052541_507306_D5EDDA17 X-CRM114-Status: GOOD ( 21.65 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 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