Hello Martin, As reported by Pavel Tikhomirov it can happen that the SCSI error handler does not get woken up. This is very annoying because it results in a queue stall. The two patches in this series address this issue without acquiring the SCSI host lock in the hot path. Please consider these patches for kernel v4.16. Thanks, Bart. Changes between v2 and v3: - Made it again safe to call scsi_eh_scmd_add() from interrupt context. Changes between v1 and v2: - Ensure that host_lock is held while checking host_failed. - Moved the lockdep_assert_held() change into a separate patch. Bart Van Assche (2): Ensure that the SCSI error handler gets woken up Convert a source code comment into a runtime check drivers/scsi/hosts.c | 6 ++++++ drivers/scsi/scsi_error.c | 21 ++++++++++++++++++--- drivers/scsi/scsi_lib.c | 39 ++++++++++++++++++++++++++++----------- include/scsi/scsi_host.h | 2 ++ 4 files changed, 54 insertions(+), 14 deletions(-) -- 2.15.0
