From patchwork Thu Mar 11 22:02:20 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 2922 Return-path: Envelope-to: mchehab@infradead.org Delivery-date: Thu, 11 Mar 2010 22:02:42 +0000 Received: from bombadil.infradead.org [18.85.46.34] by pedra with IMAP (fetchmail-6.3.6) for (single-drop); Thu, 11 Mar 2010 19:04:41 -0300 (BRT) Received: from vger.kernel.org ([209.132.180.67]) by bombadil.infradead.org with esmtp (Exim 4.69 #1 (Red Hat Linux)) id 1NpqSo-0006fi-Il; Thu, 11 Mar 2010 22:02:42 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758227Ab0CKWCl (ORCPT + 1 other); Thu, 11 Mar 2010 17:02:41 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:36976 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757330Ab0CKWCk (ORCPT ); Thu, 11 Mar 2010 17:02:40 -0500 Received: from imap1.linux-foundation.org (imap1.linux-foundation.org [140.211.169.55]) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id o2BM2LqH012866 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 11 Mar 2010 14:02:22 -0800 Received: from localhost.localdomain (localhost [127.0.0.1]) by imap1.linux-foundation.org (8.13.5.20060308/8.13.5/Debian-3ubuntu1.1) with ESMTP id o2BM2KUh013134; Thu, 11 Mar 2010 14:02:20 -0800 Message-Id: <201003112202.o2BM2KUh013134@imap1.linux-foundation.org> Subject: [patch 5/5] dib7000p: reduce large stack usage To: mchehab@infradead.org Cc: linux-media@vger.kernel.org, akpm@linux-foundation.org, randy.dunlap@oracle.com, pboettcher@dibcom.fr From: akpm@linux-foundation.org Date: Thu, 11 Mar 2010 14:02:20 -0800 MIME-Version: 1.0 X-Spam-Status: No, hits=-3.516 required=5 tests=AWL, BAYES_00, OSDL_HEADER_SUBJECT_BRACKETED X-Spam-Checker-Version: SpamAssassin 3.2.4-osdl_revision__1.47__ X-MIMEDefang-Filter: lf$Revision: 1.188 $ X-Scanned-By: MIMEDefang 2.63 on 140.211.169.13 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org From: Randy Dunlap Reduce the static stack usage of one of the 2 top offenders as listed by 'make checkstack': Building with CONFIG_FRAME_WARN=2048 produces: drivers/media/dvb/frontends/dib7000p.c:1367: warning: the frame size of 2320 bytes is larger than 2048 bytes and in 'make checkstack', the stack usage goes from: 0x00002409 dib7000p_i2c_enumeration [dib7000p]: 2328 to unlisted with this patch. Also change one caller of dib7000p_i2c_enumeration() to check its return value. Signed-off-by: Randy Dunlap Cc: Patrick Boettcher Cc: Mauro Carvalho Chehab Signed-off-by: Andrew Morton --- drivers/media/dvb/dvb-usb/cxusb.c | 5 +-- drivers/media/dvb/frontends/dib7000p.c | 36 ++++++++++++++--------- 2 files changed, 25 insertions(+), 16 deletions(-) diff -puN drivers/media/dvb/dvb-usb/cxusb.c~dib7000p-reduce-large-stack-usage drivers/media/dvb/dvb-usb/cxusb.c --- a/drivers/media/dvb/dvb-usb/cxusb.c~dib7000p-reduce-large-stack-usage +++ a/drivers/media/dvb/dvb-usb/cxusb.c @@ -1024,8 +1024,9 @@ static int cxusb_dualdig4_rev2_frontend_ cxusb_bluebird_gpio_pulse(adap->dev, 0x02, 1); - dib7000p_i2c_enumeration(&adap->dev->i2c_adap, 1, 18, - &cxusb_dualdig4_rev2_config); + if (dib7000p_i2c_enumeration(&adap->dev->i2c_adap, 1, 18, + &cxusb_dualdig4_rev2_config) < 0) + return -ENODEV; adap->fe = dvb_attach(dib7000p_attach, &adap->dev->i2c_adap, 0x80, &cxusb_dualdig4_rev2_config); diff -puN drivers/media/dvb/frontends/dib7000p.c~dib7000p-reduce-large-stack-usage drivers/media/dvb/frontends/dib7000p.c --- a/drivers/media/dvb/frontends/dib7000p.c~dib7000p-reduce-large-stack-usage +++ a/drivers/media/dvb/frontends/dib7000p.c @@ -1323,46 +1323,54 @@ EXPORT_SYMBOL(dib7000p_pid_filter); int dib7000p_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib7000p_config cfg[]) { - struct dib7000p_state st = { .i2c_adap = i2c }; + struct dib7000p_state *dpst; int k = 0; u8 new_addr = 0; + dpst = kzalloc(sizeof(struct dib7000p_state), GFP_KERNEL); + if (!dpst) + return -ENODEV; + + dpst->i2c_adap = i2c; + for (k = no_of_demods-1; k >= 0; k--) { - st.cfg = cfg[k]; + dpst->cfg = cfg[k]; /* designated i2c address */ new_addr = (0x40 + k) << 1; - st.i2c_addr = new_addr; - dib7000p_write_word(&st, 1287, 0x0003); /* sram lead in, rdy */ - if (dib7000p_identify(&st) != 0) { - st.i2c_addr = default_addr; - dib7000p_write_word(&st, 1287, 0x0003); /* sram lead in, rdy */ - if (dib7000p_identify(&st) != 0) { + dpst->i2c_addr = new_addr; + dib7000p_write_word(dpst, 1287, 0x0003); /* sram lead in, rdy */ + if (dib7000p_identify(dpst) != 0) { + dpst->i2c_addr = default_addr; + dib7000p_write_word(dpst, 1287, 0x0003); /* sram lead in, rdy */ + if (dib7000p_identify(dpst) != 0) { dprintk("DiB7000P #%d: not identified\n", k); + kfree(dpst); return -EIO; } } /* start diversity to pull_down div_str - just for i2c-enumeration */ - dib7000p_set_output_mode(&st, OUTMODE_DIVERSITY); + dib7000p_set_output_mode(dpst, OUTMODE_DIVERSITY); /* set new i2c address and force divstart */ - dib7000p_write_word(&st, 1285, (new_addr << 2) | 0x2); + dib7000p_write_word(dpst, 1285, (new_addr << 2) | 0x2); dprintk("IC %d initialized (to i2c_address 0x%x)", k, new_addr); } for (k = 0; k < no_of_demods; k++) { - st.cfg = cfg[k]; - st.i2c_addr = (0x40 + k) << 1; + dpst->cfg = cfg[k]; + dpst->i2c_addr = (0x40 + k) << 1; // unforce divstr - dib7000p_write_word(&st, 1285, st.i2c_addr << 2); + dib7000p_write_word(dpst, 1285, dpst->i2c_addr << 2); /* deactivate div - it was just for i2c-enumeration */ - dib7000p_set_output_mode(&st, OUTMODE_HIGH_Z); + dib7000p_set_output_mode(dpst, OUTMODE_HIGH_Z); } + kfree(dpst); return 0; } EXPORT_SYMBOL(dib7000p_i2c_enumeration);