diff options
| author | Matthew R. Ochs <mrochs@linux.vnet.ibm.com> | 2018-05-11 14:05:37 -0500 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-05-18 11:22:10 -0400 |
| commit | e63a8d886d346e83607e4495ec21f1a0ca6398a2 (patch) | |
| tree | 52f9218e38b7c9f78e97c9018db01588dcdf31d2 /drivers/scsi/cxlflash/common.h | |
| parent | 32a9ae415b8a4258140312f91c71324950d9eba4 (diff) | |
scsi: cxlflash: Use local mutex for AFU serialization
AFUs can only process a single AFU command at a time. This is enforced with
a global mutex situated within the AFU send routine. As this mutex has a
global scope, it has the potential to unnecessarily block commands destined
for other AFUs.
Instead of using a global mutex, transition the mutex to be per-AFU. This
will allow commands to only be blocked by siblings of the same AFU.
Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Uma Krishnan <ukrishn@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/cxlflash/common.h')
| -rw-r--r-- | drivers/scsi/cxlflash/common.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h index 89240b84745c..8908a20065c8 100644 --- a/drivers/scsi/cxlflash/common.h +++ b/drivers/scsi/cxlflash/common.h @@ -240,6 +240,7 @@ struct afu { struct cxlflash_afu_map __iomem *afu_map; /* entire MMIO map */ atomic_t cmds_active; /* Number of currently active AFU commands */ + struct mutex sync_active; /* Mutex to serialize AFU commands */ u64 hb; u32 internal_lun; /* User-desired LUN mode for this AFU */ |