[PATCH 4.19 06/77] scsi: scsi_transport_spi: Set RQF_PM for domain validation commands

Greg Kroah-Hartman
2021-01-11T13:54:42Z

From: Bart Van Assche <bvanassche@acm.org>

[ Upstream commit cfefd9f8240a7b9fdd96fcd54cb029870b6d8d88 ]

Disable runtime power management during domain validation. Since a later
patch removes RQF_PREEMPT, set RQF_PM for domain validation commands such
that these are executed in the quiesced SCSI device state.

Link: https://lore.kernel.org/r/20201209052951.16136-6-bvanassche@acm.org
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Woody Suwalski <terraluna977@gmail.com>
Cc: Can Guo <cang@codeaurora.org>
Cc: Stanley Chu <stanley.chu@mediatek.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Stan Johnson <userm57@yahoo.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/scsi_transport_spi.c | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 69213842e63e0..efb9c3d902133 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -130,12 +130,16 @@ static int spi_execute(struct scsi_device *sdev, const void *cmd,
sshdr = &sshdr_tmp;

for(i = 0; i < DV_RETRIES; i++) {
+ /*
+ * The purpose of the RQF_PM flag below is to bypass the
+ * SDEV_QUIESCE state.
+ */
result = scsi_execute(sdev, cmd, dir, buffer, bufflen, sense,
sshdr, DV_TIMEOUT, /* retries */ 1,
REQ_FAILFAST_DEV |
REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER,
- 0, NULL);
+ RQF_PM, NULL);
if (driver_byte(result) != DRIVER_SENSE ||
sshdr->sense_key != UNIT_ATTENTION)
break;
@@ -1018,23 +1022,26 @@ spi_dv_device(struct scsi_device *sdev)
*/
lock_system_sleep();

+ if (scsi_autopm_get_device(sdev))
+ goto unlock_system_sleep;
+
if (unlikely(spi_dv_in_progress(starget)))
- goto unlock;
+ goto put_autopm;

if (unlikely(scsi_device_get(sdev)))
- goto unlock;
+ goto put_autopm;

spi_dv_in_progress(starget) = 1;

buffer = kzalloc(len, GFP_KERNEL);

if (unlikely(!buffer))
- goto out_put;
+ goto put_sdev;

/* We need to verify that the actual device will quiesce; the
* later target quiesce is just a nice to have */
if (unlikely(scsi_device_quiesce(sdev)))
- goto out_free;
+ goto free_buffer;

scsi_target_quiesce(starget);

@@ -1054,12 +1061,16 @@ spi_dv_device(struct scsi_device *sdev)

spi_initial_dv(starget) = 1;

- out_free:
+free_buffer:
kfree(buffer);
- out_put:
+
+put_sdev:
spi_dv_in_progress(starget) = 0;
scsi_device_put(sdev);
-unlock:
+put_autopm:
+ scsi_autopm_put_device(sdev);
+
+unlock_system_sleep:
unlock_system_sleep();
}
EXPORT_SYMBOL(spi_dv_device);
--
2.27.0