From patchwork Thu Mar 11 22:02:19 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 2923 Return-path: Envelope-to: mchehab@infradead.org Delivery-date: Thu, 11 Mar 2010 22:02:43 +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 19:04:43 -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 1NpqSp-0006fi-Nz; Thu, 11 Mar 2010 22:02:43 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758228Ab0CKWCm (ORCPT + 1 other); Thu, 11 Mar 2010 17:02:42 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:42187 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758222Ab0CKWCk (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 o2BM2K0B012857 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 11 Mar 2010 14:02:21 -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 o2BM2JWk013131; Thu, 11 Mar 2010 14:02:19 -0800 Message-Id: <201003112202.o2BM2JWk013131@imap1.linux-foundation.org> Subject: [patch 4/5] dib3000mc: 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 14:02:19 -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/dib3000mc.c:853: warning: the frame size of 2224 bytes is larger than 2048 bytes and in 'make checkstack', the stack usage goes from: 0x00000bbd dib3000mc_i2c_enumeration [dib3000mc]: 2232 to unlisted with this patch. Signed-off-by: Randy Dunlap Cc: Patrick Boettcher Cc: Mauro Carvalho Chehab Signed-off-by: Andrew Morton --- drivers/media/dvb/frontends/dib3000mc.c | 35 +++++++++++++--------- 1 file changed, 22 insertions(+), 13 deletions(-) diff -puN drivers/media/dvb/frontends/dib3000mc.c~dib3000mc-reduce-large-stack-usage drivers/media/dvb/frontends/dib3000mc.c --- a/drivers/media/dvb/frontends/dib3000mc.c~dib3000mc-reduce-large-stack-usage +++ a/drivers/media/dvb/frontends/dib3000mc.c @@ -813,42 +813,51 @@ EXPORT_SYMBOL(dib3000mc_set_config); int dib3000mc_i2c_enumeration(struct i2c_adapter *i2c, int no_of_demods, u8 default_addr, struct dib3000mc_config cfg[]) { - struct dib3000mc_state st = { .i2c_adap = i2c }; + struct dib3000mc_state *dmcst; int k; u8 new_addr; static u8 DIB3000MC_I2C_ADDRESS[] = {20,22,24,26}; + dmcst = kzalloc(sizeof(struct dib3000mc_state), GFP_KERNEL); + if (dmcst == NULL) + return -ENODEV; + + dmcst->i2c_adap = i2c; + for (k = no_of_demods-1; k >= 0; k--) { - st.cfg = &cfg[k]; + dmcst->cfg = &cfg[k]; /* designated i2c address */ new_addr = DIB3000MC_I2C_ADDRESS[k]; - st.i2c_addr = new_addr; - if (dib3000mc_identify(&st) != 0) { - st.i2c_addr = default_addr; - if (dib3000mc_identify(&st) != 0) { + dmcst->i2c_addr = new_addr; + if (dib3000mc_identify(dmcst) != 0) { + dmcst->i2c_addr = default_addr; + if (dib3000mc_identify(dmcst) != 0) { dprintk("-E- DiB3000P/MC #%d: not identified\n", k); + kfree(dmcst); return -ENODEV; } } - dib3000mc_set_output_mode(&st, OUTMODE_MPEG2_PAR_CONT_CLK); + dib3000mc_set_output_mode(dmcst, OUTMODE_MPEG2_PAR_CONT_CLK); // set new i2c address and force divstr (Bit 1) to value 0 (Bit 0) - dib3000mc_write_word(&st, 1024, (new_addr << 3) | 0x1); - st.i2c_addr = new_addr; + dib3000mc_write_word(dmcst, 1024, (new_addr << 3) | 0x1); + dmcst->i2c_addr = new_addr; } for (k = 0; k < no_of_demods; k++) { - st.cfg = &cfg[k]; - st.i2c_addr = DIB3000MC_I2C_ADDRESS[k]; + dmcst->cfg = &cfg[k]; + dmcst->i2c_addr = DIB3000MC_I2C_ADDRESS[k]; - dib3000mc_write_word(&st, 1024, st.i2c_addr << 3); + dib3000mc_write_word(dmcst, 1024, dmcst->i2c_addr << 3); /* turn off data output */ - dib3000mc_set_output_mode(&st, OUTMODE_HIGH_Z); + dib3000mc_set_output_mode(dmcst, OUTMODE_HIGH_Z); } + + kfree(dmcst); return 0; } EXPORT_SYMBOL(dib3000mc_i2c_enumeration);