Messages in this thread | | | Subject | Re: [PATCH v4 10/10] scsi: ufs: Apply more limitations to user access | From | Bart Van Assche <> | Date | Thu, 24 Jun 2021 15:25:44 -0700 |
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On 6/23/21 7:23 PM, Can Guo wrote: > On 2021-06-24 05:51, Bart Van Assche wrote: >> On 6/23/21 12:35 AM, Can Guo wrote: >> - During system suspend, user space software is paused before the device >> driver freeze callbacks are invoked. Hence, the hba->is_sys_suspended >> check can be left out. > > is_sys_suspended indicates that system resume failed (power/clk is OFF). > >> - If a LUN is runtime suspended, it should be resumed if accessed from >> user space instead of failing user space accesses. In other words, the >> hba->is_wlu_sys_suspended check seems inappropriate to me. > > hba->is_wlu_sys_suspended indicates that wl system resume failed, device > is not operational.
Hi Can,
Thanks for the clarification. How about converting the above two answers into comments inside ufshcd_is_user_access_allowed()?
Should ufshcd_is_user_access_allowed() perhaps be called after ufshcd_rpm_get_sync() instead of before to prevent that the value of hba->is_sys_suspended or hba->is_wlu_sys_suspended changes after having been checked and before the UFS device is accessed?
Thanks,
Bart.
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