Following scenario would make scsi_device's iodone_cnt mismatch with iorequest_cnt even if there is no request on this device any more. 1. request timeout happened. If we do not retry the timeouted command, this command would be finished in scsi_finish_command() which would not increase the iodone_cnt; if the timeouted command is retried, another increasement for iorequest_cnt would be performed, the command might add iorequest_cnt for multiple times but iodone_cnt only once. Increase iodone_cnt in scsi_timeout() can handle this scenario. 2. scsi_dispatch_cmd() failed, while the iorequest_cnt has already been increased. If scsi_dispatch_cmd() failed, the request would be requeued, then another iorequest_cnt would be added. So we should not increase iorequest_cnt if dispatch command failed V2: - Add description about why we can add iodone_cnt in scsi_timeout() - Do not increase iorequest_cnt if dispatch command failed Wenchao Hao (2): scsi: increase scsi device's iodone_cnt in scsi_timeout() scsi: donot increase scsi_device's iorequest_cnt if dispatch failed drivers/scsi/scsi_error.c | 1 + drivers/scsi/scsi_lib.c | 3 +-- 2 files changed, 2 insertions(+), 2 deletions(-) -- 2.35.3
