tree 43af04f1f7eedd4dca63ad401c4ca65bc4247d5c
parent 8f73a6880183dd11b97d70e738cf82d15931d98b
author Andrew Paprocki <andrew@ishiboo.com> 1192477392 -0400
committer Jeff Garzik <jeff@garzik.org> 1192477462 -0400

libata: prevent devices with blank model names from being DMA blacklisted

The strn_pattern_cmp routine does not handle a blank name parameter
properly. The only patterns which should match a blank name are "*"
and an explicit "". If the function is passed a blank name in current
code, it will always match against the patt parameter. The bug manifests
itself as the device with the empty model name always matching the first
device in the DMA blacklist, forcing it to revert to PIO mode.

Signed-off-by: Andrew Paprocki <andrew@ishiboo.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>