staging: vc04_services: Add outstanding VCHI TODOs

The TODO list missed some issues before we can move the driver out of staging.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/interface/vchi/TODO

@@ -23,3 +23,34 @@ there's a lot code that got built that's probably unnecessary these
 days.  Once we have the set of VCHI-using drivers we want in tree, we
 should be able to do a sweep of the code to see what's left that's
 unused.
+
+3) Make driver more portable
+
+Building this driver with arm/multi_v7_defconfig or arm64/defconfig
+leads to data corruption during the following command: 
+  
+  vchiq_test -f 1
+
+This should be fixed.
+
+4) Fix kernel module support
+
+Even the VPU firmware doesn't support a VCHI re-connect, the driver
+should properly handle a module unload. This also includes that all
+resouces must be freed (kthreads, debugfs entries, ...) and global
+variables avoided.
+
+5) Fix stack hog
+
+Running make checkstack shows that vchiq_dump_service_use_state() has
+an extensive stack usage. Maybe other functions are also affected.
+
+6) Cleanup logging mechanism
+
+The driver should probably be using the standard kernel logging mechanisms
+such as dev_info, dev_dbg, and friends.
+
+7) Documentation
+
+A short top-down description of this driver's architecture (function of
+kthreads, userspace, limitations) could be very helpful for reviewers.