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Date: Mon, 21 Mar 2011 11:19:08 +0100
From: Florian Mickler <florian@...kler.org>
To: mchehab@...radead.org
Cc: linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
pb@...uxtv.org, Florian Mickler <florian@...kler.org>
Subject: [PATCH 3/9] [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@...kler.org>
---
drivers/media/dvb/dvb-usb/vp702x.c | 41 +++++++++++++++++++++++++++++------
drivers/media/dvb/dvb-usb/vp702x.h | 8 +++++++
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 25536f9..569c93f 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 c2f97f9..86960c6 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);
--
1.7.4.1
--
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