[media] hdpvr: reduce memory footprint when debugging

There is no need to use hex_dump_to_buffer() since we have a kernel helper to
dump up to 64 bytes just via printk().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 12 insertions, 36 deletions

diff --git a/drivers/media/usb/hdpvr/hdpvr-control.c b/drivers/media/usb/hdpvr/hdpvr-control.c
index 6053661dc04b..6e86032ea5db 100644
--- a/drivers/media/usb/hdpvr/hdpvr-control.c
+++ b/drivers/media/usb/hdpvr/hdpvr-control.c
@@ -59,13 +59,10 @@ int get_video_info(struct hdpvr_device *dev, struct hdpvr_video_info *vidinf)
                               1000);
 
 #ifdef HDPVR_DEBUG
-        if (hdpvr_debug & MSG_INFO) {
-                char print_buf[15];
-                hex_dump_to_buffer(dev->usbc_buf, 5, 16, 1, print_buf,
-                                   sizeof(print_buf), 0);
+        if (hdpvr_debug & MSG_INFO)
                 v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
-                         "get video info returned: %d, %s\n", ret, print_buf);
-        }
+                         "get video info returned: %d, %5ph\n", ret,
+                         dev->usbc_buf);
 #endif
         mutex_unlock(&dev->usbc_mutex);
 
@@ -82,9 +79,6 @@ int get_video_info(struct hdpvr_device *dev, struct hdpvr_video_info *vidinf)
 
 int get_input_lines_info(struct hdpvr_device *dev)
 {
-#ifdef HDPVR_DEBUG
-        char print_buf[9];
-#endif
         int ret, lines;
 
         mutex_lock(&dev->usbc_mutex);
@@ -96,13 +90,10 @@ int get_input_lines_info(struct hdpvr_device *dev)
                               1000);
 
 #ifdef HDPVR_DEBUG
-        if (hdpvr_debug & MSG_INFO) {
-                hex_dump_to_buffer(dev->usbc_buf, 3, 16, 1, print_buf,
-                                   sizeof(print_buf), 0);
+        if (hdpvr_debug & MSG_INFO)
                 v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
-                         "get input lines info returned: %d, %s\n", ret,
-                         print_buf);
-        }
+                         "get input lines info returned: %d, %3ph\n", ret,
+                         dev->usbc_buf);
 #else
         (void)ret;      /* suppress compiler warning */
 #endif
diff --git a/drivers/media/usb/hdpvr/hdpvr-core.c b/drivers/media/usb/hdpvr/hdpvr-core.c
index c5638964c3f2..42b4cdf28cfd 100644
--- a/drivers/media/usb/hdpvr/hdpvr-core.c
+++ b/drivers/media/usb/hdpvr/hdpvr-core.c
@@ -124,14 +124,6 @@ static int device_authorization(struct hdpvr_device *dev)
         int ret, retval = -ENOMEM;
         char request_type = 0x38, rcv_request = 0x81;
         char *response;
-#ifdef HDPVR_DEBUG
-        size_t buf_size = 46;
-        char *print_buf = kzalloc(5*buf_size+1, GFP_KERNEL);
-        if (!print_buf) {
-                v4l2_err(&dev->v4l2_dev, "Out of memory\n");
-                return retval;
-        }
-#endif
 
         mutex_lock(&dev->usbc_mutex);
         ret = usb_control_msg(dev->udev,
@@ -147,11 +139,9 @@ static int device_authorization(struct hdpvr_device *dev)
         }
 #ifdef HDPVR_DEBUG
         else {
-                hex_dump_to_buffer(dev->usbc_buf, 46, 16, 1, print_buf,
-                                   5*buf_size+1, 0);
                 v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
-                         "Status request returned, len %d: %s\n",
-                         ret, print_buf);
+                         "Status request returned, len %d: %46ph\n",
+                         ret, dev->usbc_buf);
         }
 #endif
 
@@ -189,15 +179,13 @@ static int device_authorization(struct hdpvr_device *dev)
 
         response = dev->usbc_buf+38;
 #ifdef HDPVR_DEBUG
-        hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
-        v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, "challenge: %s\n",
-                 print_buf);
+        v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, "challenge: %8ph\n",
+                 response);
 #endif
         challenge(response);
 #ifdef HDPVR_DEBUG
-        hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
-        v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, " response: %s\n",
-                 print_buf);
+        v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, " response: %8ph\n",
+                 response);
 #endif
 
         msleep(100);
@@ -213,9 +201,6 @@ static int device_authorization(struct hdpvr_device *dev)
         retval = ret != 8;
 unlock:
         mutex_unlock(&dev->usbc_mutex);
-#ifdef HDPVR_DEBUG
-        kfree(print_buf);
-#endif
         return retval;
 }