From c2a9331c62216e222a08de8dd58559367fef0af6 Mon Sep 17 00:00:00 2001 From: Date: Tue, 12 Apr 2005 16:38:09 -0500 Subject: [PATCH] updates for CFQ oops fix - add a comment to the device structure that the device_busy field is now protected by the request_queue->queue_lock - null out sdev->request_queue after the queue is released to trap any (and there shouldn't be any) use after the queue is freed. Signed-off-by: James Bottomley --- drivers/scsi/scsi_sysfs.c | 3 +++ include/scsi/scsi_device.h | 1 + 2 files changed, 4 insertions(+) diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 134d3a3e422..e75ee4671ee 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -171,6 +171,9 @@ void scsi_device_dev_release(struct device *dev) if (sdev->request_queue) { sdev->request_queue->queuedata = NULL; scsi_free_queue(sdev->request_queue); + /* temporary expedient, try to catch use of queue lock + * after free of sdev */ + sdev->request_queue = NULL; } scsi_target_reap(scsi_target(sdev)); diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index f6d05131829..fe9571d2e30 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -43,6 +43,7 @@ struct scsi_device { struct list_head siblings; /* list of all devices on this host */ struct list_head same_target_siblings; /* just the devices sharing same target id */ + /* this is now protected by the request_queue->queue_lock */ volatile unsigned short device_busy; /* commands actually active on low-level */ spinlock_t list_lock; struct list_head cmd_list; /* queue of in use SCSI Command structures */ -- 2.20.1