From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: [PATCH v10 3/9] Avoid calling __scsi_remove_device() twice Date: Sun, 07 Apr 2013 16:59:51 +0200 Message-ID: <516189E7.6020803@acm.org> References: <516188E5.1040008@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from jacques.telenet-ops.be ([195.130.132.50]:47636 "EHLO jacques.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933861Ab3DGO7z (ORCPT ); Sun, 7 Apr 2013 10:59:55 -0400 In-Reply-To: <516188E5.1040008@acm.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi Cc: James Bottomley , Mike Christie , Tejun Heo , Chanho Min , David Milburn , Hannes Reinecke SCSI devices are added to the shost->__devices list from inside scsi_alloc_sdev(). If something goes wrong during LUN scanning, e.g. a transport layer failure occurs, then __scsi_remove_device() can get invoked by the LUN scanning code for a SCSI device in state SDEV_CREATED_BLOCK or SDEV_BLOCKED. If this happens then the SCSI device has not yet been added to sysfs (is_visible == 0). Make sure that if this happens these devices are transitioned into state SDEV_DEL. This avoids that __scsi_remove_device() gets invoked a second time by scsi_forget_host(). Signed-off-by: Bart Van Assche Cc: James Bottomley Cc: Mike Christie Cc: Hannes Reinecke Cc: Tejun Heo --- drivers/scsi/scsi_lib.c | 2 ++ drivers/scsi/scsi_sysfs.c | 7 ++++--- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index d84cbd0..34cdcbc 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2176,6 +2176,8 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state) case SDEV_OFFLINE: case SDEV_TRANSPORT_OFFLINE: case SDEV_CANCEL: + case SDEV_BLOCK: + case SDEV_CREATED_BLOCK: break; default: goto illegal; diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 34f1b39..f869ef85 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -956,8 +956,9 @@ void __scsi_remove_device(struct scsi_device *sdev) unsigned long flags; if (sdev->is_visible) { - if (scsi_device_set_state(sdev, SDEV_CANCEL) != 0) - return; + WARN(scsi_device_set_state(sdev, SDEV_CANCEL) != 0, + "%s: unexpected state %d\n", dev_name(&sdev->sdev_gendev), + sdev->sdev_state); bsg_unregister_queue(sdev->request_queue); device_unregister(&sdev->sdev_dev); @@ -971,7 +972,7 @@ void __scsi_remove_device(struct scsi_device *sdev) * scsi_run_queue() invocations have finished before tearing down the * device. */ - scsi_device_set_state(sdev, SDEV_DEL); + WARN_ON_ONCE(scsi_device_set_state(sdev, SDEV_DEL) != 0); blk_cleanup_queue(sdev->request_queue); cancel_work_sync(&sdev->requeue_work); -- 1.7.10.4