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SubjectRe: [PATCH v5 4/7] scsi: libsas: Use new workqueue to run sas event and disco event
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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@huawei.com>
> CC: John Garry <john.garry@huawei.com>
> CC: Johannes Thumshirn <jthumshirn@suse.de>
> CC: Ewan Milne <emilne@redhat.com>
> CC: Christoph Hellwig <hch@lst.de>
> CC: Tomas Henzl <thenzl@redhat.com>
> CC: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Jason Yan <yanaijie@huawei.com>
> ---
> 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@suse.com>

Cheers,

Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +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)

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