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scsi: scsi_transport_sas: switch to bsg-lib for SMP passthrough

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Simplify the SMP passthrough code by switching it to the generic bsg-lib
helpers that abstract away the details of the request code, and gets
drivers out of seeing struct scsi_request.

For the libsas host SMP code there is a small behavior difference in
that we now always clear the residual len for successful commands,
similar to the three other SMP handler implementations.  Given that
there is no partial command handling in the host SMP handler this should
not matter in practice.

[mkp: typos and checkpatch fixes]

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
This commit is contained in:
Christoph Hellwig 2017-08-25 17:37:41 +02:00 • committed by Martin K. Petersen
commit 651a013649
9 changed files with 243 additions and 380 deletions
Download patch file Download diff file Expand all files Collapse all files

3
include/scsi/libsas.h
View file

@ -721,9 +721,6 @@ extern int sas_slave_alloc(struct scsi_device *);
extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
extern int sas_drain_work(struct sas_ha_struct *ha);
extern int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
struct request *req);
extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
struct ssp_response_iu *iu);
struct sas_phy *sas_get_local_phy(struct domain_device *dev);

4
include/scsi/scsi_transport_sas.h
View file

@ -5,6 +5,7 @@
#include <linux/types.h>
#include <linux/mutex.h>
#include <scsi/sas.h>
#include <linux/bsg-lib.h>
struct scsi_transport_template;
struct sas_rphy;
@ -176,7 +177,8 @@ struct sas_function_template {
int (*phy_setup)(struct sas_phy *);
void (*phy_release)(struct sas_phy *);
int (*set_phy_speed)(struct sas_phy *, struct sas_phy_linkrates *);
int (*smp_handler)(struct Scsi_Host *, struct sas_rphy *, struct request *);
void (*smp_handler)(struct bsg_job *, struct Scsi_Host *,
struct sas_rphy *);
};