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authorBenjamin Block <bblock@linux.ibm.com>2020-05-08 19:23:28 +0200
committerMartin K. Petersen <martin.petersen@oracle.com>2020-05-11 23:19:46 -0400
commit978857c7e367d6841f71c4ded5a8c244520f5e22 (patch)
tree9fcc9cd420fd168044aa6920ea3bf132cf26f7cc /drivers/s390
parentb59293b469b9e1bbdaf314123498b83a5a9e9ce9 (diff)
scsi: zfcp: Move shost modification after QDIO (re-)open into fenced function
When establishing and activating the QDIO queue pair for a FCP device for the first time, or after an adapter recovery, we publish some of its characteristics to the scsi host object representing that FCP device. When moving the scsi host object allocation and registration to after the first exchange config and exchange port data, this is not possible for the former case - QDIO open for the first time - because that happens before exchange config and exchange port data. Move the scsi host object update into a fenced function that checks whether the object already exists or not. This way we can repeat that step later, once we are past the allocation. Once the first recovery succeeds we don't release the scsi host object anymore, so further recoveries do work as before. Link: https://lore.kernel.org/r/a214ebf508f71e3690113e3e90edab1cea0e24e3.1588956679.git.bblock@linux.ibm.com Reviewed-by: Steffen Maier <maier@linux.ibm.com> Signed-off-by: Benjamin Block <bblock@linux.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/scsi/zfcp_ext.h2
-rw-r--r--drivers/s390/scsi/zfcp_qdio.c19
2 files changed, 16 insertions, 5 deletions
diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h
index 88294ca0e2ea..d67f31b9b859 100644
--- a/drivers/s390/scsi/zfcp_ext.h
+++ b/drivers/s390/scsi/zfcp_ext.h
@@ -153,6 +153,8 @@ extern int zfcp_qdio_sbal_get(struct zfcp_qdio *);
extern int zfcp_qdio_send(struct zfcp_qdio *, struct zfcp_qdio_req *);
extern int zfcp_qdio_sbals_from_sg(struct zfcp_qdio *, struct zfcp_qdio_req *,
struct scatterlist *);
+extern void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
+ const struct zfcp_qdio *const qdio);
extern int zfcp_qdio_open(struct zfcp_qdio *);
extern void zfcp_qdio_close(struct zfcp_qdio *);
extern void zfcp_qdio_siosl(struct zfcp_adapter *);
diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c
index 26702b56a7ab..3a7f3374d10a 100644
--- a/drivers/s390/scsi/zfcp_qdio.c
+++ b/drivers/s390/scsi/zfcp_qdio.c
@@ -4,7 +4,7 @@
*
* Setup and helper functions to access QDIO.
*
- * Copyright IBM Corp. 2002, 2017
+ * Copyright IBM Corp. 2002, 2020
*/
#define KMSG_COMPONENT "zfcp"
@@ -342,6 +342,18 @@ void zfcp_qdio_close(struct zfcp_qdio *qdio)
atomic_set(&qdio->req_q_free, 0);
}
+void zfcp_qdio_shost_update(struct zfcp_adapter *const adapter,
+ const struct zfcp_qdio *const qdio)
+{
+ struct Scsi_Host *const shost = adapter->scsi_host;
+
+ if (shost == NULL)
+ return;
+
+ shost->sg_tablesize = qdio->max_sbale_per_req;
+ shost->max_sectors = qdio->max_sbale_per_req * 8;
+}
+
/**
* zfcp_qdio_open - prepare and initialize response queue
* @qdio: pointer to struct zfcp_qdio
@@ -420,10 +432,7 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio)
atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q);
atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status);
- if (adapter->scsi_host) {
- adapter->scsi_host->sg_tablesize = qdio->max_sbale_per_req;
- adapter->scsi_host->max_sectors = qdio->max_sbale_per_req * 8;
- }
+ zfcp_qdio_shost_update(adapter, qdio);
return 0;

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