[src/jdolecek-ncq]: src/sys/dev/ata note possible problem with ata_exec_xfer()

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d00de0e9b57e
branches:  jdolecek-ncq
changeset: 822898:d00de0e9b57e
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Sun Apr 23 09:16:35 2017 +0000

description:
note possible problem with ata_exec_xfer()

diffstat:

 sys/dev/ata/TODO.ncq |  3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diffs (13 lines):

diff -r a440c98b0f17 -r d00de0e9b57e sys/dev/ata/TODO.ncq
--- a/sys/dev/ata/TODO.ncq      Sun Apr 23 01:30:30 2017 +0000
+++ b/sys/dev/ata/TODO.ncq      Sun Apr 23 09:16:35 2017 +0000
@@ -12,6 +12,9 @@
 
 test wd* at umass?, confirm the ata_channel kludge works
 
+is ata_exec_xfer() + POLL safe wrt. more outstanding I/Os? why is it waiting
+until xfer is head of queue? also layer violation with the ata_xfer_free() call
+
 NCQ PRIO/ICC handling
 ---------------------
 fix handling of ATA 'devices' value to be full 16-bit value, to prepare for