Re: [PATCH v1 1/2] scsi: ufs: set device as default active power mode during initialization only

Stanley Chu
2019-12-31T01:08:13Z

Hi Asutosh,

> I see that there's a get_sync done before.
> So, how would the suspend be triggered in that case?
>

Would you mean pm_runtime_get_sync() in ufshcd_init()?
If yes, it will only happen during initialization.

The runtime resume path may go through ufshcd_probe_hba() without
ufshcd_init() invoked before, for example,

ufshcd_probe_hba+0xe10/0x1874
ufshcd_host_reset_and_restore+0x114/0x1a4
ufshcd_resume+0x1d0/0x480
ufshcd_runtime_resume+0x40/0x188
ufshcd_pltfrm_runtime_resume+0x10/0x18
pm_generic_runtime_resume+0x24/0x44
__rpm_callback+0x100/0x250
rpm_resume+0x548/0x7c8
rpm_resume+0x2b4/0x7c8
rpm_resume+0x2b4/0x7c8
rpm_resume+0x2b4/0x7c8
pm_runtime_work+0x9c/0xa0
process_one_work+0x210/0x4e0
worker_thread+0x390/0x520
kthread+0x154/0x18c
ret_from_fork+0x10/0x18

This case happens if link is in "off" state while resume.

Thanks,
Stanley