V4L/DVB (6732): dsbr100 violates DMA coherency rules

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/media/radio/dsbr100.c b/drivers/media/radio/dsbr100.c
index 3bd07f7e3774..36c0e3651502 100644
--- a/drivers/media/radio/dsbr100.c
+++ b/drivers/media/radio/dsbr100.c
@@ -33,6 +33,9 @@
 
  History:
 
+ Version 0.43:
+        Oliver Neukum: avoided DMA coherency issue
+
  Version 0.42:
         Converted dsbr100 to use video_ioctl2
         by Douglas Landgraf <dougsland@gmail.com>
@@ -135,7 +138,7 @@ module_param(radio_nr, int, 0);
 struct dsbr100_device {
         struct usb_device *usbdev;
         struct video_device *videodev;
-        unsigned char transfer_buffer[TB_LEN];
+        u8 *transfer_buffer;
         int curfreq;
         int stereo;
         int users;
@@ -237,10 +240,7 @@ static void dsbr100_getstat(struct dsbr100_device *radio)
 /* handle unplugging of the device, release data structures
 if nothing keeps us from doing it.  If something is still
 keeping us busy, the release callback of v4l will take care
-of releasing it.  stv680.c does not relase its private
-data, so I don't do this here either.  Checking out the
-code I'd expect I better did that, but if there's a memory
-leak here it's tiny (~50 bytes per disconnect) */
+of releasing it. */
 static void usb_dsbr100_disconnect(struct usb_interface *intf)
 {
         struct dsbr100_device *radio = usb_get_intfdata(intf);
@@ -250,6 +250,7 @@ static void usb_dsbr100_disconnect(struct usb_interface *intf)
                 video_unregister_device(radio->videodev);
                 radio->videodev = NULL;
                 if (radio->users) {
+                        kfree(radio->transfer_buffer);
                         kfree(radio);
                 } else {
                         radio->removed = 1;
@@ -425,6 +426,7 @@ static int usb_dsbr100_close(struct inode *inode, struct file *file)
                 return -ENODEV;
         radio->users = 0;
         if (radio->removed) {
+                kfree(radio->transfer_buffer);
                 kfree(radio);
         }
         return 0;
@@ -471,7 +473,12 @@ static int usb_dsbr100_probe(struct usb_interface *intf,
 
         if (!(radio = kmalloc(sizeof(struct dsbr100_device), GFP_KERNEL)))
                 return -ENOMEM;
+        if (!(radio->transfer_buffer = kmalloc(TB_LEN, GFP_KERNEL))) {
+                kfree(radio);
+                return -ENOMEM;
+        }
         if (!(radio->videodev = video_device_alloc())) {
+                kfree(radio->transfer_buffer);
                 kfree(radio);
                 return -ENOMEM;
         }
@@ -485,6 +492,7 @@ static int usb_dsbr100_probe(struct usb_interface *intf,
         if (video_register_device(radio->videodev, VFL_TYPE_RADIO,radio_nr)) {
                 warn("Could not register video device");
                 video_device_release(radio->videodev);
+                kfree(radio->transfer_buffer);
                 kfree(radio);
                 return -EIO;
         }