quoted

+	num_element =
+	    es58x_msg_num_element(es58x_dev->dev,
+				  bulk_rx_loopback_msg->rx_loopback_msg,
+				  msg_len);
+	if (unlikely(num_element <= 0))
+		return num_element;

Meta-comment on your use of 'unlikely' everywhere.  Please drop it, it's
only to be used if you can actually measure the difference in a
benchmark.  You are dealing with USB devices, which are really really
slow here.  Also, humans make horrible guessers for this type of thing,
the compiler and CPU can get this right much more often than we can, and
we had the numbers for it (someone measured that 80-90% of our usages of
these markings are actually wrong on modern cpus).

So just drop them all, it makes the code simpler to read and understand,
and the cpu can actually go faster.

All those branch on which the unlikely() macro were applied were
supposed to never been executed under normal circumstances. But I
indeed have no benchmark to claim such use.

Thank you for the detailed explanation, makes perfect sense. Each use
of the likely()/unlikely() macros will be removed in v3 revision.