During runtime-suspend of ufs host, the scsi devices are
already suspended and so are the queues associated with them.
But the ufs host sends SSU to wlun during its runtime-suspend.
During the process blk_queue_enter checks if the queue is not in
suspended state. If so, it waits for the queue to resume, and never
comes out of it.
The commit
(d55d15a33: scsi: block: Do not accept any requests while suspended)
adds the check if the queue is in suspended state in blk_queue_enter().
Fix this, by decoupling wlun scsi devices from block layer pm.
The runtime-pm for these devices would be managed by bsg and sg drivers.
Call trace:
__switch_to+0x174/0x2c4
__schedule+0x478/0x764
schedule+0x9c/0xe0
blk_queue_enter+0x158/0x228
blk_mq_alloc_request+0x40/0xa4
blk_get_request+0x2c/0x70
__scsi_execute+0x60/0x1c4
ufshcd_set_dev_pwr_mode+0x124/0x1e4
ufshcd_suspend+0x208/0x83c
ufshcd_runtime_suspend+0x40/0x154
ufshcd_pltfrm_runtime_suspend+0x14/0x20
pm_generic_runtime_suspend+0x28/0x3c
__rpm_callback+0x80/0x2a4
rpm_suspend+0x308/0x614
rpm_idle+0x158/0x228
pm_runtime_work+0x84/0xac
process_one_work+0x1f0/0x470
worker_thread+0x26c/0x4c8
kthread+0x13c/0x320
ret_from_fork+0x10/0x18
Change-Id: Id777fd52493c8b5522d1ebcad73cd30dac33e8a4
Signed-off-by: Asutosh Das <asutoshd@xxxxxxxxxxxxxx>
Signed-off-by: Can Guo <cang@xxxxxxxxxxxxxx>
Signed-off-by: Bao D. Nguyen <nguyenb@xxxxxxxxxxxxxx>
---
drivers/scsi/ufs/ufshcd.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 9c691e4..b7e7f81 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7217,16 +7217,6 @@ static void ufshcd_set_active_icc_lvl(struct ufs_hba *hba)
kfree(desc_buf);
}
-static inline void ufshcd_blk_pm_runtime_init(struct scsi_device *sdev)
-{
- scsi_autopm_get_device(sdev);
- blk_pm_runtime_init(sdev->request_queue, &sdev->sdev_gendev);
- if (sdev->rpm_autosuspend)
- pm_runtime_set_autosuspend_delay(&sdev->sdev_gendev,
- RPM_AUTOSUSPEND_DELAY_MS);
- scsi_autopm_put_device(sdev);
-}
-
/**
* ufshcd_scsi_add_wlus - Adds required W-LUs
* @hba: per-adapter instance
@@ -7265,7 +7255,6 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
hba->sdev_ufs_device = NULL;
goto out;
}
- ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
scsi_device_put(hba->sdev_ufs_device);
hba->sdev_rpmb = __scsi_add_device(hba->host, 0, 0,
@@ -7274,17 +7263,14 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba *hba)
ret = PTR_ERR(hba->sdev_rpmb);
goto remove_sdev_ufs_device;
}
- ufshcd_blk_pm_runtime_init(hba->sdev_rpmb);
scsi_device_put(hba->sdev_rpmb);
sdev_boot = __scsi_add_device(hba->host, 0, 0,
ufshcd_upiu_wlun_to_scsi_wlun(UFS_UPIU_BOOT_WLUN), NULL);
- if (IS_ERR(sdev_boot)) {
+ if (IS_ERR(sdev_boot))
dev_err(hba->dev, "%s: BOOT WLUN not found\n", __func__);
- } else {
- ufshcd_blk_pm_runtime_init(sdev_boot);
+ else
scsi_device_put(sdev_boot);
- }
goto out;
remove_sdev_ufs_device:
--
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