use a linked list to hold data, utilize Linux api

1 files changed, 6 insertions, 3 deletions

diff --git a/debug.c b/debug.c
index c1d4529..c359046 100644
--- a/debug.c
+++ b/debug.c
@@ -115,9 +115,12 @@ int hello_read_procmem(char *page, char **start, off_t off, int count, int *eof,
 
     struct hello_dev *dev = (struct hello_dev *) data;
 
-    len = sprintf(page, "hello module internal buffer is at: %p, with index of: %lu, "
-            "buffer starts with: %c\n", dev->hello_buffer, dev->buff_index,
-            dev->hello_buffer[0]);
+    if (down_interruptible(&dev->sem)) /* protects page buffer from multiple writes */
+        return -ERESTARTSYS;
+    len = sprintf(page, "hello module internal buffer is at: %p, with size of: %lu, "
+            "buffer starts with: %c\n", dev->mylist, dev->ll_size,
+            dev->mylist ? dev->mylist->chunk[0] : '0');
+    up(&dev->sem);
 
     *eof = 1; /* signify that we're done with dumping our internal structure */