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block: add reference counting for struct bsg_job 

Add reference counting to 'struct bsg_job' so we can implement a reuqest
timeout handler for bsg_jobs, which is needed for Fibre Channel.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Johannes Thumshirn 2016-11-17 10:31:18 +01:00 committed by Martin K. Petersen
parent ad7660cc1e
commit bf0f2d380f
2 changed files with 7 additions and 2 deletions
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7
block/bsg-lib.c
View File

@ -32,8 +32,10 @@
* bsg_destroy_job - routine to teardown/delete a bsg job
* @job: bsg_job that is to be torn down
*/
static void bsg_destroy_job(struct bsg_job *job)
static void bsg_destroy_job(struct kref *kref)
{
struct bsg_job *job = container_of(kref, struct bsg_job, kref);
put_device(job->dev); /* release reference for the request */
kfree(job->request_payload.sg_list);
@ -84,7 +86,7 @@ static void bsg_softirq_done(struct request *rq)
struct bsg_job *job = rq->special;
blk_end_request_all(rq, rq->errors);
bsg_destroy_job(job);
kref_put(&job->kref, bsg_destroy_job);
}
static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)
@ -142,6 +144,7 @@ static int bsg_create_job(struct device *dev, struct request *req)
job->dev = dev;
/* take a reference for the request */
get_device(job->dev);
kref_init(&job->kref);
return 0;
failjob_rls_rqst_payload:

2
include/linux/bsg-lib.h
View File

@ -40,6 +40,8 @@ struct bsg_job {
struct device *dev;
struct request *req;
struct kref kref;
/* Transport/driver specific request/reply structs */
void *request;
void *reply;