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FROMLIST: scsi: ufs: Fix deadlock while suspending ufs host

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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

Bug: 178653131
Link: https://lore.kernel.org/linux-arm-msm/7929cc67311133f8dbdfe5e627cf6a2f1daa486e.1611719814.git.asutoshd@codeaurora.org/T/#u
Change-Id: I78e49e0dd7d4d16c1d6691ea04f9aabab2ef8f43
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
This commit is contained in:
Asutosh Das
2021-01-26 19:37:56 -08:00
committed by Todd Kjos
parent e48a262853
commit e7d848c921
1 changed files with 2 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/scsi/ufs/ufshcd.c
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@@ -7134,16 +7134,6 @@ out:
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
@@ -7182,7 +7172,6 @@ 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,
@@ -7191,17 +7180,14 @@ 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: