[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

Tested-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Florian Mickler <florian@mickler.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/media/dvb/dvb-usb/lmedm04.c b/drivers/media/dvb/dvb-usb/lmedm04.c
index b47ec3055ff7..a4457e4c1246 100644
--- a/drivers/media/dvb/dvb-usb/lmedm04.c
+++ b/drivers/media/dvb/dvb-usb/lmedm04.c
@@ -329,13 +329,19 @@ 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]);
 
-        return (ret < 0) ? -ENODEV : data[2];
+        ret = (ret < 0) ? -ENODEV : data[2];
+        kfree(data);
+        return ret;
 }
 
 static int lme2510_msg(struct dvb_usb_device *d,
@@ -655,7 +661,7 @@ 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;
@@ -663,6 +669,11 @@ 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");
 
@@ -706,7 +717,7 @@ static int lme2510_download_firmware(struct usb_device *dev,
         else
                 info("FRM Firmware Download Completed - Resetting Device");
 
-
+        kfree(data);
         return (ret < 0) ? -ENODEV : 0;
 }