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As mmc_claim_host() invokes pm_runtime_get_sync() for the mmc host device, it's important that the host is kept claimed for *all* accesses to it via the host_ops callbacks. In mmc_rescan(), the ->card_event() and the ->get_cd() callback are being invoked without claiming the host, let's fix this. Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>