Hi: >-----Original Message----- >From: Oliver Neukum [mailto:oneukum@xxxxxxxx] >Sent: Tuesday, October 30, 2018 4:56 PM >To: Zengtao (B) <prime.zeng@xxxxxxxxxxxxx>; jejb@xxxxxxxxxxxxxxxxxx; >gregkh@xxxxxxxxxxxxxxxxxxx; martin.petersen@xxxxxxxxxx; >stern@xxxxxxxxxxxxxxxxxxx >Cc: usb-storage@xxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; >linux-scsi@xxxxxxxxxxxxxxx; linux-usb@xxxxxxxxxxxxxxx >Subject: Re: scsi_set_medium_removal timeout issue > >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. > 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 >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 Regards Zengtao
