Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754265Ab1CUSeL (ORCPT ); Mon, 21 Mar 2011 14:34:11 -0400 Received: from ist.d-labs.de ([213.239.218.44]:43641 "EHLO mx01.d-labs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754204Ab1CUSeE (ORCPT ); Mon, 21 Mar 2011 14:34:04 -0400 From: Florian Mickler To: mchehab@infradead.org Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, js@linuxtv.org, tskd2@yahoo.co.jp, liplianin@me.by, g.marco@freenet.de, aet@rasterburn.org, pb@linuxtv.org, mkrufky@linuxtv.org, nick@nick-andrew.net, max@veneto.com, janne-dvb@grunau.be, Florian Mickler Subject: [PATCH 3/6] [media] friio: get rid of on-stack dma buffers Date: Mon, 21 Mar 2011 19:33:43 +0100 Message-Id: <1300732426-18958-4-git-send-email-florian@mickler.org> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1300732426-18958-1-git-send-email-florian@mickler.org> References: <1300732426-18958-1-git-send-email-florian@mickler.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2242 Lines: 89 usb_control_msg initiates (and waits for completion of) a dma transfer using the supplied buffer. That buffer thus has to be seperately allocated on the heap. In lib/dma_debug.c the function check_for_stack even warns about it: WARNING: at lib/dma-debug.c:866 check_for_stack Note: This change is tested to compile only, as I don't have the hardware. Signed-off-by: Florian Mickler --- drivers/media/dvb/dvb-usb/friio.c | 23 +++++++++++++++++++---- 1 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/media/dvb/dvb-usb/friio.c b/drivers/media/dvb/dvb-usb/friio.c index 14a65b4..76159ae 100644 --- a/drivers/media/dvb/dvb-usb/friio.c +++ b/drivers/media/dvb/dvb-usb/friio.c @@ -142,17 +142,20 @@ static u32 gl861_i2c_func(struct i2c_adapter *adapter) return I2C_FUNC_I2C; } - static int friio_ext_ctl(struct dvb_usb_adapter *adap, u32 sat_color, int lnb_on) { int i; int ret; struct i2c_msg msg; - u8 buf[2]; + u8 *buf; u32 mask; u8 lnb = (lnb_on) ? FRIIO_CTL_LNB : 0; + buf = kmalloc(2, GFP_KERNEL); + if (!buf) + return -ENOMEM; + msg.addr = 0x00; msg.flags = 0; msg.len = 2; @@ -189,6 +192,7 @@ static int friio_ext_ctl(struct dvb_usb_adapter *adap, buf[1] |= FRIIO_CTL_CLK; ret += gl861_i2c_xfer(&adap->dev->i2c_adap, &msg, 1); + kfree(buf); return (ret == 70); } @@ -219,11 +223,20 @@ static int friio_initialize(struct dvb_usb_device *d) int ret; int i; int retry = 0; - u8 rbuf[2]; - u8 wbuf[3]; + u8 *rbuf, *wbuf; deb_info("%s called.\n", __func__); + wbuf = kmalloc(3, GFP_KERNEL); + if (!wbuf) + return -ENOMEM; + + rbuf = kmalloc(2, GFP_KERNEL); + if (!rbuf) { + kfree(wbuf); + return -ENOMEM; + } + /* use gl861_i2c_msg instead of gl861_i2c_xfer(), */ /* because the i2c device is not set up yet. */ wbuf[0] = 0x11; @@ -358,6 +371,8 @@ restart: return 0; error: + kfree(wbuf); + kfree(rbuf); deb_info("%s:ret == %d\n", __func__, ret); return -EIO; } -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/