nvme: copy MTFA field from identify controller

We use the controller's reported maximum firmware activation time as our
timeout before resetting a controller for a failed activation notice,
but this value was never being read so we could only use the default
timeout. Copy the Identify Controller MTFA field to the corresponding
nvme_ctrl's mtfa field.

Fixes: b6dccf7fae433 (“nvme: add support for FW activation without reset”).
Reviewed-by: Max Gurtovoy <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Minwoo Im <[e-mail]>
Signed-off-by: Laine Walker-Avina <[e-mail]>
[changelog, fix endian]
Signed-off-by: Keith Busch <[e-mail]>

drivers/nvme/host/core.c

···
 
 	ctrl->oacs = le16_to_cpu(id->oacs);
 	ctrl->oncs = le16_to_cpu(id->oncs);
+	ctrl->mtfa = le16_to_cpu(id->mtfa);
 	ctrl->oaes = le32_to_cpu(id->oaes);
 	atomic_set(&ctrl->abort_limit, id->acl + 1);
 	ctrl->vwc = id->vwc;