linux-kernel - [PATCH RESEND v4 08/15] block: add reference counting for struct bsg

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Date:   Thu, 17 Nov 2016 16:09:31 +0100
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     James Bottomley <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     Hannes Reinecke <hare@...e.de>,
        Christoph Hellwig <hch@...radead.org>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Jens Axboe <axboe@...nel.dk>,
        linux-block@...r.kernel.org (open list:BLOCK LAYER)
Subject: [PATCH RESEND v4 08/15] 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@...e.de>
Reviewed-by: Hannes Reinecke <hare@...e.com>
---
 block/bsg-lib.c         | 7 +++++--
 include/linux/bsg-lib.h | 2 ++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index 650f427..632fb40 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -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:
diff --git a/include/linux/bsg-lib.h b/include/linux/bsg-lib.h
index a226652..58e0717 100644
--- a/include/linux/bsg-lib.h
+++ b/include/linux/bsg-lib.h
@@ -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;
-- 
1.8.5.6