Merge tag 'topic/core-stuff-2014-12-10' of git://anongit.freedesktop.org/drm-intel into drm-next

Merge drm core fixes from Daniel.

* tag 'topic/core-stuff-2014-12-10' of git://anongit.freedesktop.org/drm-intel:
  drm: Zero out DRM object memory upon cleanup
  drm: fix a typo in a comment
  drm: fix a word repetition in a comment
  drm: Fix memory leak at error path of drm_read()
  drm/Documentation: Fix rowspan value in drm-kms-properties
  drm/edid: Restore kerneldoc consistency
  drm/edid: new drm_edid_block_checksum helper function V3
  drm/edid: shorten log output in case of all zeroes edid block
  drm/edid: move drm_edid_is_zero to top, make edid argument const

1 files changed, 28 insertions, 15 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 72fd8820e186..53bc7a628909 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -1017,6 +1017,25 @@ MODULE_PARM_DESC(edid_fixup,
 
 static void drm_get_displayid(struct drm_connector *connector,
                               struct edid *edid);
+
+static int drm_edid_block_checksum(const u8 *raw_edid)
+{
+        int i;
+        u8 csum = 0;
+        for (i = 0; i < EDID_LENGTH; i++)
+                csum += raw_edid[i];
+
+        return csum;
+}
+
+static bool drm_edid_is_zero(const u8 *in_edid, int length)
+{
+        if (memchr_inv(in_edid, 0, length))
+                return false;
+
+        return true;
+}
+
 /**
  * drm_edid_block_valid - Sanity check the EDID block (base or extension)
  * @raw_edid: pointer to raw EDID block
@@ -1030,8 +1049,7 @@ static void drm_get_displayid(struct drm_connector *connector,
  */
 bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
 {
-        int i;
-        u8 csum = 0;
+        u8 csum;
         struct edid *edid = (struct edid *)raw_edid;
 
         if (WARN_ON(!raw_edid))
@@ -1051,8 +1069,7 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
                 }
         }
 
-        for (i = 0; i < EDID_LENGTH; i++)
-                csum += raw_edid[i];
+        csum = drm_edid_block_checksum(raw_edid);
         if (csum) {
                 if (print_bad_edid) {
                         DRM_ERROR("EDID checksum is invalid, remainder is %d\n", csum);
@@ -1083,9 +1100,13 @@ bool drm_edid_block_valid(u8 *raw_edid, int block, bool print_bad_edid)
 
 bad:
         if (print_bad_edid) {
-                printk(KERN_ERR "Raw EDID:\n");
-                print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
+                if (drm_edid_is_zero(raw_edid, EDID_LENGTH)) {
+                        printk(KERN_ERR "EDID block is all zeroes\n");
+                } else {
+                        printk(KERN_ERR "Raw EDID:\n");
+                        print_hex_dump(KERN_ERR, " \t", DUMP_PREFIX_NONE, 16, 1,
                                raw_edid, EDID_LENGTH, false);
+                }
         }
         return false;
 }
@@ -1118,7 +1139,7 @@ EXPORT_SYMBOL(drm_edid_is_valid);
 #define DDC_SEGMENT_ADDR 0x30
 /**
  * drm_do_probe_ddc_edid() - get EDID information via I2C
- * @adapter: I2C device adaptor
+ * @data: I2C device adapter
  * @buf: EDID data buffer to be filled
  * @block: 128 byte EDID block to start fetching from
  * @len: EDID data buffer length to fetch
@@ -1179,14 +1200,6 @@ drm_do_probe_ddc_edid(void *data, u8 *buf, unsigned int block, size_t len)
         return ret == xfers ? 0 : -1;
 }
 
-static bool drm_edid_is_zero(u8 *in_edid, int length)
-{
-        if (memchr_inv(in_edid, 0, length))
-                return false;
-
-        return true;
-}
-
 /**
  * drm_do_get_edid - get EDID data using a custom EDID block read function
  * @connector: connector we're probing