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scsi: sd: Fix system start for ATA devices

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It is not always possible to keep a device in the runtime suspended state
when a system level suspend/resume cycle is executed. E.g. for ATA devices
connected to AHCI adapters, system resume resets the ATA ports, which
causes connected devices to spin up. In such case, a runtime suspended disk
will incorrectly be seen with a suspended runtime state because the device
is not resumed by sd_resume_system(). The power state seen by the user is
different than the actual device physical power state.

Fix this issue by introducing the struct scsi_device flag
force_runtime_start_on_system_start. When set, this flag causes
sd_resume_system() to request a runtime resume operation for runtime
suspended devices. This results in the user seeing the device runtime_state
as active after a system resume, thus correctly reflecting the device
physical power state.

Fixes: 9131bff6a9 ("scsi: core: pm: Only runtime resume if necessary")
Cc: <stable@vger.kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20231120225631.37938-3-dlemoal@kernel.org
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2023-11-21 07:56:31 +09:00 committed by Martin K. Petersen
parent 6371be7aeb
commit b09d7f8fd5
3 changed files with 19 additions and 1 deletions
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5
drivers/ata/libata-scsi.c
View File

@ -1055,9 +1055,14 @@ int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
* Ask the sd driver to issue START STOP UNIT on runtime suspend
* and resume and shutdown only. For system level suspend/resume,
* devices power state is handled directly by libata EH.
* Given that disks are always spun up on system resume, also
* make sure that the sd driver forces runtime suspended disks
* to be resumed to correctly reflect the power state of the
* device.
*/
sdev->manage_runtime_start_stop = 1;
sdev->manage_shutdown = 1;
sdev->force_runtime_start_on_system_start = 1;
}
/*

9
drivers/scsi/sd.c
View File

@ -3949,8 +3949,15 @@ static int sd_resume(struct device *dev, bool runtime)
static int sd_resume_system(struct device *dev)
{
if (pm_runtime_suspended(dev))
if (pm_runtime_suspended(dev)) {
struct scsi_disk *sdkp = dev_get_drvdata(dev);
struct scsi_device *sdp = sdkp ? sdkp->device : NULL;
if (sdp && sdp->force_runtime_start_on_system_start)
pm_request_resume(dev);
return 0;
}
return sd_resume(dev, false);
}

6
include/scsi/scsi_device.h
View File

@ -181,6 +181,12 @@ struct scsi_device {
*/
unsigned manage_shutdown:1;
/*
* If set and if the device is runtime suspended, ask the high-level
* device driver (sd) to force a runtime resume of the device.
*/
unsigned force_runtime_start_on_system_start:1;
unsigned removable:1;
unsigned changed:1; /* Data invalid due to media change */
unsigned busy:1; /* Used to prevent races */