In spirit of scsi drivers playing nicely with realtime, the following removes most the use of tasklets throughout drivers/scsi/ replacing them with either threaded irqs or workqueues such that they run in regular task context instead of irq; and in addition cleans up a lot of the async work deferral code. Only two users remain (those that do the MSIX vector of tasklets): pm8001 and pmcraid, which I don't have a suitable equivalent yet. One possibility would be to have a single threaded wq per msix vector entry and thus run concurrently. Yes, there's a bit more overhead with a task than for a softirq, but the problem with softirqs and tasklets is that they can't be preempted, and thus are more important than all tasks on the system. Furthermore there are no guarantees it will run in irq context at all if ksoftirq kicks in. Because of a total lack of hardware, these patches have only been compile-tested. Please consider for v5.21. Thanks! Davidlohr Bueso (10): scsi/mvsas: Kill CONFIG_SCSI_MVSAS_TASKLET scsi/megaraid: Replace adapter->dpc_h tasklet with threaded irq scsi/megaraid_sas: Replace instance->tasklet with threaded irq scsi/aic94xx: Replace the donelist tasklet with threaded irq scsi/isci: Replace completion_tasklet with threaded irq scsi/ibmvscsi_tgt: Replace work tasklet with threaded irq scsi/esas2r: Replace tasklet with workqueue scsi/ibmvfc: Replace tasklet with work scsi/ibmvscsi: Replace srp tasklet with work scsi/lpfc: Remove bogus references to discovery tasklet drivers/scsi/aic94xx/aic94xx_hwi.c | 23 ++---- drivers/scsi/aic94xx/aic94xx_hwi.h | 5 +- drivers/scsi/aic94xx/aic94xx_init.c | 5 +- drivers/scsi/aic94xx/aic94xx_scb.c | 88 ++++++--------------- drivers/scsi/aic94xx/aic94xx_task.c | 16 ++-- drivers/scsi/aic94xx/aic94xx_tmf.c | 40 +++++----- drivers/scsi/esas2r/esas2r.h | 19 ++--- drivers/scsi/esas2r/esas2r_init.c | 20 +++-- drivers/scsi/esas2r/esas2r_int.c | 20 ++--- drivers/scsi/esas2r/esas2r_io.c | 2 +- drivers/scsi/esas2r/esas2r_main.c | 34 +++++--- drivers/scsi/ibmvscsi/ibmvfc.c | 21 ++--- drivers/scsi/ibmvscsi/ibmvfc.h | 3 +- drivers/scsi/ibmvscsi/ibmvscsi.c | 38 ++++++--- drivers/scsi/ibmvscsi/ibmvscsi.h | 3 +- drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 17 ++-- drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.h | 1 - drivers/scsi/isci/host.c | 12 +-- drivers/scsi/isci/host.h | 3 +- drivers/scsi/isci/init.c | 17 ++-- drivers/scsi/lpfc/lpfc.h | 2 - drivers/scsi/lpfc/lpfc_disc.h | 2 +- drivers/scsi/megaraid/mega_common.h | 2 - drivers/scsi/megaraid/megaraid_mbox.c | 52 +++++------- drivers/scsi/megaraid/megaraid_sas.h | 3 +- drivers/scsi/megaraid/megaraid_sas_base.c | 51 ++++++------ drivers/scsi/megaraid/megaraid_sas_fusion.c | 18 +++-- drivers/scsi/mvsas/Kconfig | 7 -- drivers/scsi/mvsas/mv_init.c | 44 ++--------- drivers/scsi/mvsas/mv_sas.h | 1 - 30 files changed, 245 insertions(+), 324 deletions(-) -- 2.36.1
