Use pr_fmt with both module name and __func__
Also drop few bare printk leftovers

The log format should stay pretty much intact
Signed-off-by: NTomas Winkler <tomas.winkler@intel.com>
Acked-by: NDouglas Gilbert <dgilbert@interlog.com>
Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: NJames Bottomley <JBottomley@Odin.com>