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intel_link_probe() could return error and dev_get_drvdata() will return null in such case. So we have to test link->cdns after link->cdns = dev_get_drvdata(&ldev->auxdev.dev); Otherwise, we will meet the "kernel NULL pointer dereference" error. Signed-off-by: Bard Liao <[email protected]> Reviewed-by: Ranjani Sridharan <[email protected]> Reviewed-by: Rander Wang <[email protected]> Reviewed-by: Pierre-Louis Bossart <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Vinod Koul <[email protected]>