From patchwork Tue Mar 15 09:00:31 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Artem Bityutskiy X-Patchwork-Id: 86898 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from bombadil.infradead.org (bombadil.infradead.org [18.85.46.34]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id 0CED1B700D for ; Tue, 15 Mar 2011 20:00:03 +1100 (EST) Received: from canuck.infradead.org ([2001:4978:20e::1]) by bombadil.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1PzQ4w-0008Ti-8K; Tue, 15 Mar 2011 08:58:10 +0000 Received: from localhost ([127.0.0.1] helo=canuck.infradead.org) by canuck.infradead.org with esmtp (Exim 4.72 #1 (Red Hat Linux)) id 1PzQ4s-0007WS-Ei; Tue, 15 Mar 2011 08:58:06 +0000 Received: from smtp.nokia.com ([147.243.128.24] helo=mgw-da01.nokia.com) by canuck.infradead.org with esmtps (Exim 4.72 #1 (Red Hat Linux)) id 1PzQ4m-0007UN-TU for linux-mtd@lists.infradead.org; Tue, 15 Mar 2011 08:58:02 +0000 Received: from nokia.com (localhost [127.0.0.1]) by mgw-da01.nokia.com (Switch-3.4.3/Switch-3.4.3) with ESMTP id p2F8vwUb031816 for ; Tue, 15 Mar 2011 10:57:58 +0200 Received: from eru.research.nokia.com ([[172.21.24.59]]) by mgw-da01.nokia.com with ESMTP id p2F8vdmb031449 ; Tue, 15 Mar 2011 10:57:47 +0200 From: Artem Bityutskiy To: MTD list Subject: [PATCH 2/7] UBI: allocate erase checking buffer on demand Date: Tue, 15 Mar 2011 11:00:31 +0200 Message-Id: <1300179636-12183-3-git-send-email-dedekind1@gmail.com> X-Mailer: git-send-email 1.7.2.3 In-Reply-To: <1300179636-12183-1-git-send-email-dedekind1@gmail.com> References: <1300179636-12183-1-git-send-email-dedekind1@gmail.com> X-Nokia-AV: Clean X-CRM114-Version: 20090807-BlameThorstenAndJenny ( TRE 0.7.6 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20110315_045801_254236_FF26CA90 X-CRM114-Status: UNSURE ( 9.94 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 2.7 (++) X-Spam-Report: SpamAssassin version 3.3.1 on canuck.infradead.org summary: Content analysis details: (2.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [147.243.128.24 listed in list.dnswl.org] 0.0 FREEMAIL_FROM Sender email is freemail (dedekind1[at]gmail.com) 0.0 DKIM_ADSP_CUSTOM_MED No valid author signature, adsp_override is CUSTOM_MED 2.2 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit (dedekind1[at]gmail.com) 1.2 NML_ADSP_CUSTOM_MED ADSP custom_med hit, and not from a mailing list Cc: Adrian Hunter X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-mtd-bounces@lists.infradead.org Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org From: Artem Bityutskiy Instead of using pre-allocated 'ubi->dbg_peb_buf' buffer in 'ubi_dbg_check_all_ff()', dynamically allocate it when needed. The intend is to get rid of the pre-allocated 'ubi->dbg_peb_buf' buffer completely. And the need for this arises because we want to change to dynamic debugging control instead of compile-time control, i.e., we are going to kill the CONFIG_MTD_UBI_DEBUG_PARANOID Kconfig option, which would mean that 'ubi->dbg_peb_buf' is always allocated, which would be wasteful. Thus, we are getting rid of 'ubi->dbg_peb_buf', and this is a preparation for that. signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/io.c | 19 ++++++++++++------- 1 files changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c index b4d34ba..35da5aa 100644 --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -1387,35 +1387,40 @@ int ubi_dbg_check_all_ff(struct ubi_device *ubi, int pnum, int offset, int len) { size_t read; int err; + void *buf; loff_t addr = (loff_t)pnum * ubi->peb_size + offset; - mutex_lock(&ubi->dbg_buf_mutex); - err = ubi->mtd->read(ubi->mtd, addr, len, &read, ubi->dbg_peb_buf); + buf = __vmalloc(len, GFP_KERNEL | GFP_NOFS, PAGE_KERNEL); + if (!buf) { + ubi_err("cannot allocate memory to check for 0xFFs"); + return 0; + } + + err = ubi->mtd->read(ubi->mtd, addr, len, &read, buf); if (err && err != -EUCLEAN) { ubi_err("error %d while reading %d bytes from PEB %d:%d, " "read %zd bytes", err, len, pnum, offset, read); goto error; } - err = ubi_check_pattern(ubi->dbg_peb_buf, 0xFF, len); + err = ubi_check_pattern(buf, 0xFF, len); if (err == 0) { ubi_err("flash region at PEB %d:%d, length %d does not " "contain all 0xFF bytes", pnum, offset, len); goto fail; } - mutex_unlock(&ubi->dbg_buf_mutex); + vfree(buf); return 0; fail: ubi_err("paranoid check failed for PEB %d", pnum); ubi_msg("hex dump of the %d-%d region", offset, offset + len); - print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, - ubi->dbg_peb_buf, len, 1); + print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1); err = -EINVAL; error: ubi_dbg_dump_stack(); - mutex_unlock(&ubi->dbg_buf_mutex); + vfree(buf); return err; }