On Sun, May 29, 2016 at 08:41:13AM -0700, James Bottomley wrote: > Actually, it doesn't look fine at all. The same mechanism that's > supposed to protect the host_failed decrement is also supposed to > protect the list_move_tail(). If there's a problem with the former > then we're also in danger of corrupting the list. No, that's not the case. eh_entry is used for two things: a) shost->eh_cmd_q, which is used to queue up command for the EH thread, and is locked using the host lock. b) various on-stack lists in the EH thread scsi_eh_finish_cmd is only called for case b) as all EH thread implementations move the commands from eh_cmd_q to a local list as the very first thing. host_fail on the other hand is incremented under the host_lock in scsi_eh_scmd_add, but decremented without any lock from the EH thread. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html