On 12/08/2017 10:42 AM, Jason Yan wrote: > Now all libsas works are queued to scsi host workqueue, > include sas event work post by LLDD and sas discovery > work, and a sas hotplug flow may be divided into several > works, e.g libsas receive a PORTE_BYTES_DMAED event, > currently we process it as following steps: > sas_form_port --- run in work in shost workq > sas_discover_domain --- run in another work in shost workq > ... > sas_probe_devices --- run in new work in shost workq > We found during hot-add a device, libsas may need run several > works in same workqueue to add device in system, the process is > not atomic, it may interrupt by other sas event works, like > PHYE_LOSS_OF_SIGNAL. > > This patch is preparation of execute libsas sas event in sync. We need > to use different workqueue to run sas event and disco event. Otherwise > the work will be blocked for waiting another chained work in the same > workqueue. > > Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx> > CC: John Garry <john.garry@xxxxxxxxxx> > CC: Johannes Thumshirn <jthumshirn@xxxxxxx> > CC: Ewan Milne <emilne@xxxxxxxxxx> > CC: Christoph Hellwig <hch@xxxxxx> > CC: Tomas Henzl <thenzl@xxxxxxxxxx> > CC: Dan Williams <dan.j.williams@xxxxxxxxx> > Signed-off-by: Jason Yan <yanaijie@xxxxxxxxxx> > --- > drivers/scsi/libsas/sas_discover.c | 2 +- > drivers/scsi/libsas/sas_event.c | 6 +++--- > drivers/scsi/libsas/sas_init.c | 18 ++++++++++++++++++ > include/scsi/libsas.h | 3 +++ > 4 files changed, 25 insertions(+), 4 deletions(-) > Reviewed-by: Hannes Reinecke <hare@xxxxxxxx> Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)
