linux-kernel - [PATCH 12/16] [media] lmedm04: get rid of on-stack dma buffers

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Message-Id: <1300178655-24832-12-git-send-email-florian@mickler.org>
Date:	Tue, 15 Mar 2011 09:43:44 +0100
From:	Florian Mickler <florian@...kler.org>
To:	mchehab@...radead.org
Cc:	oliver@...kum.org, jwjstone@...tmail.fm,
	Florian Mickler <florian@...kler.org>,
	linux-kernel@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	linux-media@...r.kernel.org, Malcolm Priestley <tvboxspy@...il.com>
Subject: [PATCH 12/16] [media] lmedm04: get rid of on-stack dma buffers

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 <florian@...kler.org>
---
 drivers/media/dvb/dvb-usb/lmedm04.c |   16 +++++++++++++---
 1 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/media/dvb/dvb-usb/lmedm04.c b/drivers/media/dvb/dvb-usb/lmedm04.c
index 0a3e88f..bec5439 100644
--- a/drivers/media/dvb/dvb-usb/lmedm04.c
+++ b/drivers/media/dvb/dvb-usb/lmedm04.c
@@ -314,12 +314,17 @@ static int lme2510_int_read(struct dvb_usb_adapter *adap)
 static int lme2510_return_status(struct usb_device *dev)
 {
 	int ret = 0;
-	u8 data[10] = {0};
+	u8 *data;
+
+	data = kzalloc(10, GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
 
 	ret |= usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 			0x06, 0x80, 0x0302, 0x00, data, 0x0006, 200);
 	info("Firmware Status: %x (%x)", ret , data[2]);
 
+	kfree(data);
 	return (ret < 0) ? -ENODEV : data[2];
 }
 
@@ -603,7 +608,7 @@ static int lme2510_download_firmware(struct usb_device *dev,
 					const struct firmware *fw)
 {
 	int ret = 0;
-	u8 data[512] = {0};
+	u8 *data;
 	u16 j, wlen, len_in, start, end;
 	u8 packet_size, dlen, i;
 	u8 *fw_data;
@@ -611,6 +616,11 @@ static int lme2510_download_firmware(struct usb_device *dev,
 	packet_size = 0x31;
 	len_in = 1;
 
+	data = kzalloc(512, GFP_KERNEL);
+	if (!data) {
+		info("FRM Could not start Firmware Download (Buffer allocation failed)");
+		return -ENOMEM;
+	}
 
 	info("FRM Starting Firmware Download");
 
@@ -654,7 +664,7 @@ static int lme2510_download_firmware(struct usb_device *dev,
 	else
 		info("FRM Firmware Download Completed - Resetting Device");
 
-
+	kfree(data);
 	return (ret < 0) ? -ENODEV : 0;
 }
 
-- 
1.7.4.rc3

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