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
