From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Smart Subject: [REPOST] [PATCH] fc transport: bug fix: correct references Date: Mon, 26 Jun 2006 14:19:59 -0400 Message-ID: <1151345999.5883.9.camel@localhost.localdomain> Reply-To: James.Smart@Emulex.Com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from emulex.emulex.com ([138.239.112.1]:51937 "EHLO emulex.emulex.com") by vger.kernel.org with ESMTP id S932608AbWFZSUA (ORCPT ); Mon, 26 Jun 2006 14:20:00 -0400 Received: from xbl3.ad.emulex.com (xbl3.ma.emulex.com [138.239.73.12]) by emulex.emulex.com (8.13.6/8.13.6) with ESMTP id k5QIJwZ9011248 for ; Mon, 26 Jun 2006 11:19:59 -0700 (PDT) Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Original post was incorrect as it didn't realize that we already had a self-referenc due to device_initialize(), and we were really only missing the put on our own reference. This was hidden by the other bug which had the midlayer reusing stargets after they were already free, which was doing too many puts on our rport. Updating FC transport for: - Add put in fc_rport_final_delete(), to release the rport. Prior, we were leaving the rport with a reference, thus the shost with references, etc. If the driver was unloaded, shosts and rports remained, along with work threads, etc - Fix fc_rport_create failure path - too many put's on parent - Add commenting to easily track ref taking. -- james s Original Post: http://marc.theaimsgroup.com/?l=linux-scsi&m=115039021604020&w=2 Signed-off-by: James Smart diff -upNr a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c --- a/drivers/scsi/scsi_transport_fc.c 2006-06-14 11:37:09.000000000 -0400 +++ b/drivers/scsi/scsi_transport_fc.c 2006-06-26 14:06:17.000000000 -0400 @@ -1476,7 +1476,8 @@ fc_rport_final_delete(void *data) transport_remove_device(dev); device_del(dev); transport_destroy_device(dev); - put_device(&shost->shost_gendev); + put_device(&shost->shost_gendev); /* for fc_host->rport list */ + put_device(dev); /* for self-reference */ } @@ -1537,13 +1538,13 @@ fc_rport_create(struct Scsi_Host *shost, else rport->scsi_target_id = -1; list_add_tail(&rport->peers, &fc_host->rports); - get_device(&shost->shost_gendev); + get_device(&shost->shost_gendev); /* for fc_host->rport list */ spin_unlock_irqrestore(shost->host_lock, flags); dev = &rport->dev; - device_initialize(dev); - dev->parent = get_device(&shost->shost_gendev); + device_initialize(dev); /* takes self reference */ + dev->parent = get_device(&shost->shost_gendev); /* parent reference */ dev->release = fc_rport_dev_release; sprintf(dev->bus_id, "rport-%d:%d-%d", shost->host_no, channel, rport->number); @@ -1567,10 +1568,9 @@ fc_rport_create(struct Scsi_Host *shost, delete_rport: transport_destroy_device(dev); - put_device(dev->parent); spin_lock_irqsave(shost->host_lock, flags); list_del(&rport->peers); - put_device(&shost->shost_gendev); + put_device(&shost->shost_gendev); /* for fc_host->rport list */ spin_unlock_irqrestore(shost->host_lock, flags); put_device(dev->parent); kfree(rport);