[media] au0828: Add option to preallocate digital transfer buffers

Added command line parameter preallocate_big_buffers so that the digital
transfer buffers can be allocated when the driver is registered. They
do not have to be allocated every time a feed is started.

Signed-off-by: Tim Mester <tmester@ieee.org>
Acked-by: Devin Heitmueller <dheitmueller@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index bd9d19a..ab45a6f 100644 (file)
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -173,9 +173,8 @@ static int au0828_usb_probe(struct usb_interface *interface,
        const struct usb_device_id *id)
 {
        int ifnum;
-#ifdef CONFIG_VIDEO_AU0828_V4L2
-       int retval;
-#endif
+       int retval = 0;
+
        struct au0828_dev *dev;
        struct usb_device *usbdev = interface_to_usbdev(interface);
 
@@ -257,7 +256,11 @@ static int au0828_usb_probe(struct usb_interface *interface,
 #endif
 
        /* Digital TV */
-       au0828_dvb_register(dev);
+       retval = au0828_dvb_register(dev);
+       if (retval)
+               pr_err("%s() au0282_dev_register failed\n",
+                      __func__);
+
 
        /* Store the pointer to the au0828_dev so it can be accessed in
           au0828_usb_disconnect */
@@ -268,7 +271,7 @@ static int au0828_usb_probe(struct usb_interface *interface,
 
        mutex_unlock(&dev->lock);
 
-       return 0;
+       return retval;
 }
 
 static struct usb_driver au0828_usb_driver = {

diff --git a/drivers/media/usb/au0828/au0828-dvb.c b/drivers/media/usb/au0828/au0828-dvb.c
index 3c718db..19fe049 100644 (file)
--- a/drivers/media/usb/au0828/au0828-dvb.c
+++ b/drivers/media/usb/au0828/au0828-dvb.c
@@ -33,6 +33,10 @@
 #include "mxl5007t.h"
 #include "tda18271.h"
 
+int preallocate_big_buffers;
+module_param_named(preallocate_big_buffers, preallocate_big_buffers, int, 0644);
+MODULE_PARM_DESC(preallocate_big_buffers, "Preallocate the larger transfer buffers at module load time");
+
 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
 
 #define _AU0828_BULKPIPE 0x83
@@ -155,7 +159,9 @@ static int stop_urb_transfer(struct au0828_dev *dev)
        for (i = 0; i < URB_COUNT; i++) {
                if (dev->urbs[i]) {
                        usb_kill_urb(dev->urbs[i]);
-                       kfree(dev->urbs[i]->transfer_buffer);
+                       if (!preallocate_big_buffers)
+                               kfree(dev->urbs[i]->transfer_buffer);
+
                        usb_free_urb(dev->urbs[i]);
                }
        }
@@ -183,7 +189,12 @@ static int start_urb_transfer(struct au0828_dev *dev)
 
                purb = dev->urbs[i];
 
-               purb->transfer_buffer = kzalloc(URB_BUFSIZE, GFP_KERNEL);
+               if (preallocate_big_buffers)
+                       purb->transfer_buffer = dev->dig_transfer_buffer[i];
+               else
+                       purb->transfer_buffer = kzalloc(URB_BUFSIZE,
+                                       GFP_KERNEL);
+
                if (!purb->transfer_buffer) {
                        usb_free_urb(purb);
                        dev->urbs[i] = NULL;
@@ -334,6 +345,23 @@ static int dvb_register(struct au0828_dev *dev)
 
        dprintk(1, "%s()\n", __func__);
 
+       if (preallocate_big_buffers) {
+               int i;
+               for (i = 0; i < URB_COUNT; i++) {
+                       dev->dig_transfer_buffer[i] = kzalloc(URB_BUFSIZE,
+                                       GFP_KERNEL);
+
+                       if (!dev->dig_transfer_buffer[i]) {
+                               result = -ENOMEM;
+
+                               printk(KERN_ERR
+                                      "%s: failed buffer allocation (errno = %d)\n",
+                                      DRIVER_NAME, result);
+                               goto fail_adapter;
+                       }
+               }
+       }
+
        INIT_WORK(&dev->restart_streaming, au0828_restart_dvb_streaming);
 
        /* register adapter */
@@ -424,6 +452,13 @@ fail_frontend:
        dvb_frontend_detach(dvb->frontend);
        dvb_unregister_adapter(&dvb->adapter);
 fail_adapter:
+
+       if (preallocate_big_buffers) {
+               int i;
+               for (i = 0; i < URB_COUNT; i++)
+                       kfree(dev->dig_transfer_buffer[i]);
+       }
+
        return result;
 }
 
@@ -444,6 +479,14 @@ void au0828_dvb_unregister(struct au0828_dev *dev)
        dvb_unregister_frontend(dvb->frontend);
        dvb_frontend_detach(dvb->frontend);
        dvb_unregister_adapter(&dvb->adapter);
+
+       if (preallocate_big_buffers) {
+               int i;
+               for (i = 0; i < URB_COUNT; i++)
+                       kfree(dev->dig_transfer_buffer[i]);
+       }
+
+
 }
 
 /* All the DVB attach calls go here, this function get's modified

diff --git a/drivers/media/usb/au0828/au0828.h b/drivers/media/usb/au0828/au0828.h
index a00b400..5439772 100644 (file)
--- a/drivers/media/usb/au0828/au0828.h
+++ b/drivers/media/usb/au0828/au0828.h
@@ -262,6 +262,10 @@ struct au0828_dev {
        /* USB / URB Related */
        int             urb_streaming;
        struct urb      *urbs[URB_COUNT];
+
+       /* Preallocated transfer digital transfer buffers */
+
+       char *dig_transfer_buffer[URB_COUNT];
 };
 
 /* ----------------------------------------------------------- */