msm: synx: protect clean up with mutex lock

While cleaning up synx table entry, hold the lock for that particular
entry. This will make sure that any other read/write for same entry waits
till cleaning is done.

Also, Change log level of empty table entries from warning to debug.

Change-Id: Ib092f41a12fb943ed184c031dca481a75d3446e3
Signed-off-by: Ram Nagesh <quic_ramnages@quicinc.com>

drivers/media/platform/msm/synx/synx_debugfs.c

@@ -67,14 +67,14 @@ static ssize_t synx_table_read(struct file *file,
 	if (columns & STATE_COLUMN)
 		cur += scnprintf(cur, end - cur, "|  Status  |");
 	cur += scnprintf(cur, end - cur, "\n");
-	for (i = 0; i < SYNX_MAX_OBJS; i++) {
+	for (i = 1; i < SYNX_MAX_OBJS; i++) {
 		row = &dev->synx_table[i];
 
 		index = row->index;
 		mutex_lock(&dev->row_locks[index]);
 		if (!row->index) {
 			mutex_unlock(&dev->row_locks[index]);
-			pr_warn("synx obj at %d invalid\n", index);
+			pr_debug("synx obj at %d invalid\n", index);
 			continue;
 		}
 

drivers/media/platform/msm/synx/synx_util.c

@@ -252,7 +252,9 @@ int synx_deinit_object(struct synx_table_row *row)
 		}
 	}
 
+	mutex_lock(&synx_dev->row_locks[index]);
 	memset(row, 0, sizeof(*row));
+	mutex_unlock(&synx_dev->row_locks[index]);
 	clear_bit(index, synx_dev->bitmap);
 
 	pr_debug("destroying synx obj at %d successful\n", index);