Index: uspace/lib/usb/src/debug.c
===================================================================
--- uspace/lib/usb/src/debug.c	(revision 960bee9b5ba3efcc8c5c9d486ebeaad527f1f223)
+++ uspace/lib/usb/src/debug.c	(revision 7ab7c7f682acb2b85b576ebffa9c394b68bd0feb)
@@ -158,5 +158,7 @@
 
 /** Fibril local storage for the dumped buffer. */
-static fibril_local char buffer_dump[BUFFER_DUMP_LEN];
+static fibril_local char buffer_dump[2][BUFFER_DUMP_LEN];
+/** Fibril local storage for buffer switching. */
+static fibril_local int buffer_dump_index = 0;
 
 /** Dump buffer into string.
@@ -167,5 +169,6 @@
  * can not do that) and you do not have to guard it against concurrent
  * calls to it.
- * The only limitation is that each call rewrites the buffer again.
+ * The only limitation is that each second call rewrites the buffer again
+ * (internally, two buffer are used in cyclic manner).
  * Thus, it is necessary to copy the buffer elsewhere (that includes printing
  * to screen or writing to file).
@@ -173,5 +176,5 @@
  * that is not a big limitation.
  *
- * @warning You cannot use this function twice in the same printf
+ * @warning You cannot use this function more than twice in the same printf
  * (see detailed explanation).
  *
@@ -185,8 +188,7 @@
 {
 	/*
-	 * Remove previous string (that might also reveal double usage of
-	 * this function).
+	 * Remove previous string.
 	 */
-	bzero(buffer_dump, BUFFER_DUMP_LEN);
+	bzero(buffer_dump[buffer_dump_index], BUFFER_DUMP_LEN);
 
 	if (buffer == NULL) {
@@ -202,5 +204,5 @@
 	/* How many bytes are available in the output buffer. */
 	size_t buffer_remaining_size = BUFFER_DUMP_LEN - 1 - REMAINDER_STR_LEN;
-	char *it = buffer_dump;
+	char *it = buffer_dump[buffer_dump_index];
 
 	size_t index = 0;
@@ -253,5 +255,9 @@
 	}
 
-	return buffer_dump;
+	/* Next time, use the other buffer. */
+	buffer_dump_index = 1 - buffer_dump_index;
+
+	/* Need to take the old one due to previous line. */
+	return buffer_dump[1 - buffer_dump_index];
 }