RE: scsi_set_medium_removal timeout issue
From: Zengtao (B)
Date: Tue Oct 30 2018 - 05:24:50 EST
>From: Oliver Neukum [mailto:oneukum@xxxxxxxx]
>Sent: Tuesday, October 30, 2018 4:56 PM
>To: Zengtao (B) <prime.zeng@xxxxxxxxxxxxx>; jejb@xxxxxxxxxxxxxxxxxx;
>Cc: usb-storage@xxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
>Subject: Re: scsi_set_medium_removal timeout issue
>On Di, 2018-10-30 at 08:28 +0000, Zengtao (B) wrote:
>> For the issue itself, there is my observation:
>> In the step 4, the Host will issue an
>PREVENT_ALLOW_MEDIUM_REMOVAL scsi command.
>> and and timeout happens due to the device 's very slow
>> I found there are two methods to workaround the issue:
>> 1. Change the timeout value of host scsi command
>> PREVENT_ALLOW_MEDIUM_REMOVAL to to about 60 seconds from 10
>That is near useless, because the gadget can be used with other systems.
Is it reasonable to keep the current value? Or can we change it to cover
as much systems as possible.
>> 2. Remove the fsg_lun_fsync_sub in the device's Mass storage gadget
>It exists for a reason. The blocks have to be on the medium.
>It seems to me that your gadget just allows too many dirty pages in the