From: Damien Le Moal dlemoal@kernel.org
stable inclusion from stable-v6.6.5 commit b32c0a7cb93f9c5e726b45faf61311d90a7b5319 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8N21P
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit b09d7f8fd50f6e93cbadd8d27fde178f745b42a1 upstream.
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: 9131bff6a9f1 ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/ata/libata-scsi.c | 5 +++++ drivers/scsi/sd.c | 9 ++++++++- include/scsi/scsi_device.h | 6 ++++++ 3 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 87fe8a85a2a6..4209fb39f644 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -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; }
/* diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 6effa13039f3..e17509f0b3fa 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3953,8 +3953,15 @@ 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); } diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index b919ed24220d..8fa1153f37cb 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -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 */