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Block layer RPM is enabled for the genernal UFS SCSI devices when they are
probed by their driver. However block layer RPM is not enabled for UFS
well-known SCSI devices.
As UFS SCSI devices have their corresponding BSG char devices, accessing a
BSG char device via IOCTL may send requests to its corresponding SCSI
device through its request queue. If BSG IOCTL sends a request to a
well-known SCSI device when HBA is not runtime active, due to block layer
RPM not being enabled for the well-known SCSI devices, the HBA, which is at
the top of a SCSI device's parent chain, will not be resumed.
This change enables block layer RPM for the well-known SCSI devices so that
block layer can handle RPM for the well-known SCSI devices just like for
the general SCSI devices.
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
fb276f7701