tree 3e343cd5493d442d1a26dc7a421422d84698831e
parent bef9c558841604116704e10b3d9ff3dbf4939423
author Jeff Garzik <jgarzik@pobox.com> 1117158867 -0400
committer Jeff Garzik <jgarzik@pobox.com> 1117158867 -0400

libata: Fix use-after-iounmap

Jens Axboe pointed out that the iounmap() call in libata was occurring
too early, and some drivers (ahci, probably others) were using ioremap'd
memory after it had been unmapped.

The patch should address that problem by way of improving the libata
driver API:

* move ->host_stop() call after all ->port_stop() calls have occurred.

* create default helper function ata_host_stop(), and move iounmap()
call there.

* add ->host_stop_prewalk() hook, use it in sata_qstor.c (hi Mark).
sata_qstor appears to require the host-stop-before-port-stop ordering
that existed prior to applying the attached patch.