[media] vp702x: preallocate memory on device probe

This sets up a buffer and a mutex protecting that buffer in
the struct vp702x_device_state.

The definition of struct vp702x_device_state is moved into the header
in order to use the buffer also in the frontend.

Signed-off-by: Florian Mickler <florian@mickler.org>
Cc: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 42 insertions, 7 deletions

diff --git a/drivers/media/dvb/dvb-usb/vp702x.c b/drivers/media/dvb/dvb-usb/vp702x.c
index 25536f98c4d1..569c93fbb86c 100644
--- a/drivers/media/dvb/dvb-usb/vp702x.c
+++ b/drivers/media/dvb/dvb-usb/vp702x.c
@@ -15,6 +15,7 @@
  * see Documentation/dvb/README.dvb-usb for more information
  */
 #include "vp702x.h"
+#include <linux/mutex.h>
 
 /* debug */
 int dvb_usb_vp702x_debug;
@@ -29,10 +30,6 @@ struct vp702x_adapter_state {
         u8  pid_filter_state;
 };
 
-struct vp702x_device_state {
-        u8 power_state;
-};
-
 /* check for mutex FIXME */
 int vp702x_usb_in_op(struct dvb_usb_device *d, u8 req, u16 value, u16 index, u8 *b, int blen)
 {
@@ -241,8 +238,38 @@ static struct dvb_usb_device_properties vp702x_properties;
 static int vp702x_usb_probe(struct usb_interface *intf,
                 const struct usb_device_id *id)
 {
-        return dvb_usb_device_init(intf, &vp702x_properties,
-                                   THIS_MODULE, NULL, adapter_nr);
+        struct dvb_usb_device *d;
+        struct vp702x_device_state *st;
+        int ret;
+
+        ret = dvb_usb_device_init(intf, &vp702x_properties,
+                                   THIS_MODULE, &d, adapter_nr);
+        if (ret)
+                goto out;
+
+        st = d->priv;
+        st->buf_len = 16;
+        st->buf = kmalloc(st->buf_len, GFP_KERNEL);
+        if (!st->buf) {
+                ret = -ENOMEM;
+                dvb_usb_device_exit(intf);
+                goto out;
+        }
+        mutex_init(&st->buf_mutex);
+
+out:
+        return ret;
+
+}
+
+static void vp702x_usb_disconnect(struct usb_interface *intf)
+{
+        struct dvb_usb_device *d = usb_get_intfdata(intf);
+        struct vp702x_device_state *st = d->priv;
+        mutex_lock(&st->buf_mutex);
+        kfree(st->buf);
+        mutex_unlock(&st->buf_mutex);
+        dvb_usb_device_exit(intf);
 }
 
 static struct usb_device_id vp702x_usb_table [] = {
@@ -309,7 +336,7 @@ static struct dvb_usb_device_properties vp702x_properties = {
 static struct usb_driver vp702x_usb_driver = {
         .name           = "dvb_usb_vp702x",
         .probe          = vp702x_usb_probe,
-        .disconnect     = dvb_usb_device_exit,
+        .disconnect     = vp702x_usb_disconnect,
         .id_table       = vp702x_usb_table,
 };
 
diff --git a/drivers/media/dvb/dvb-usb/vp702x.h b/drivers/media/dvb/dvb-usb/vp702x.h
index c2f97f96c21f..86960c657522 100644
--- a/drivers/media/dvb/dvb-usb/vp702x.h
+++ b/drivers/media/dvb/dvb-usb/vp702x.h
@@ -98,6 +98,14 @@ extern int dvb_usb_vp702x_debug;
 #define RESET_TUNER             0xBE
 /* IN  i: 0, v: 0, no extra buffer */
 
+struct vp702x_device_state {
+        u8 power_state;
+        struct mutex buf_mutex;
+        int buf_len;
+        u8 *buf;
+};
+
+
 extern struct dvb_frontend * vp702x_fe_attach(struct dvb_usb_device *d);
 
 extern int vp702x_usb_inout_op(struct dvb_usb_device *d, u8 *o, int olen, u8 *i, int ilen, int msec);