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60 lines
1.7 KiB
60 lines
1.7 KiB
From 27d169318cbd6c8647f689e8dcff08920040408a Mon Sep 17 00:00:00 2001
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From: Hannes Reinecke <hare@suse.de>
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Date: Thu, 19 Nov 2009 14:39:24 +0100
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Subject: [PATCH] multipath: detach existing hardware handler if none was specified
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Patch-mainline: not yet
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When no hardware handler was specified in the multipath configuration
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we should be detaching any existing ones. Otherwise unpredictable
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results will happen.
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Signed-off-by: Hannes Reinecke <hare@suse.de>
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---
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drivers/md/dm-mpath.c | 32 ++++++++++++++++++--------------
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1 file changed, 18 insertions(+), 14 deletions(-)
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--- a/drivers/md/dm-mpath.c
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+++ b/drivers/md/dm-mpath.c
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@@ -642,23 +642,27 @@ static struct pgpath *parse_path(struct
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memcpy(p->path.pdev, p->path.dev->name, 16);
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}
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- if (m->hw_handler_name && p->path.dev) {
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+ if (p->path.dev) {
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struct request_queue *q = bdev_get_queue(p->path.dev->bdev);
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- r = scsi_dh_attach(q, m->hw_handler_name);
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- if (r == -EBUSY) {
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- /*
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- * Already attached to different hw_handler,
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- * try to reattach with correct one.
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- */
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- scsi_dh_detach(q);
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+ if (m->hw_handler_name) {
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r = scsi_dh_attach(q, m->hw_handler_name);
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- }
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-
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- if (r < 0) {
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- ti->error = "error attaching hardware handler";
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- dm_put_device(ti, p->path.dev);
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- goto bad;
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+ if (r == -EBUSY) {
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+ /*
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+ * Already attached to different hw_handler,
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+ * try to reattach with correct one.
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+ */
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+ scsi_dh_detach(q);
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+ r = scsi_dh_attach(q, m->hw_handler_name);
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+ }
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+ if (r < 0) {
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+ ti->error = "error attaching hardware handler";
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+ dm_put_device(ti, p->path.dev);
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+ goto bad;
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+ }
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+ } else {
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+ /* Play safe and detach hardware handler */
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+ scsi_dh_detach(q);
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}
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if (m->hw_handler_params) {
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