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dm mpath: use hw_handler_params if attached hw_handler is same as requested

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Let the requested m->hw_handler_params be used if the attached hardware
handler is the same handler as requested with m->hw_handler_name.

Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
tang.junhui 2016-11-24 15:11:48 +08:00 committed by Mike Snitzer
parent c538f6ec9f
commit 54cd640d20
1 changed files with 9 additions and 5 deletions
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14
drivers/md/dm-mpath.c
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@ -849,19 +849,23 @@ static struct pgpath *parse_path(struct dm_arg_set *as, struct path_selector *ps
retain:
attached_handler_name = scsi_dh_attached_handler_name(q, GFP_KERNEL);
if (attached_handler_name) {
/*
* Clear any hw_handler_params associated with a
* handler that isn't already attached.
*/
if (m->hw_handler_name && strcmp(attached_handler_name, m->hw_handler_name)) {
kfree(m->hw_handler_params);
m->hw_handler_params = NULL;
}
/*
* Reset hw_handler_name to match the attached handler
* and clear any hw_handler_params associated with the
* ignored handler.
*
* NB. This modifies the table line to show the actual
* handler instead of the original table passed in.
*/
kfree(m->hw_handler_name);
m->hw_handler_name = attached_handler_name;
kfree(m->hw_handler_params);
m->hw_handler_params = NULL;
}
}