Re: scsi_set_medium_removal timeout issue

[Oliver Neukum]

On Di, 2018-10-30 at 08:28 +0000,  Zengtao (B)  wrote:
> Hi 

> 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 fsg_lun_fsync_sub.
> 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 seconds.

That is near useless, because the gadget can be used with other
systems.

> 2. Remove the fsg_lun_fsync_sub in the device's Mass storage gadget driver.

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
cache.

	Regards
		Oliver