scsi: fix device handler detach oops
This fixes a regression caused by commit 1d5203 ("scsi: handle more device handler setup/teardown in common code"). The bug is that the alua detach() callout will try to access the sddev->scsi_dh_data, but we have already set it to NULL. This patch moves the clearing of that field to after detach() is called. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Christoph Hellwig <hch@lst.de>
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