99 lines
3.3 KiB
Plaintext
99 lines
3.3 KiB
Plaintext
From: Hannes Reinecke <hare@suse.de>
|
|
Subject: Kernel bug triggered in multipath
|
|
References: bnc#486001
|
|
Patch-mainline: not yet
|
|
|
|
Starting multipath on a cciss device will cause a kernel
|
|
warning to be triggered. Problem is that we're using the
|
|
->queuedata field of the request_queue to derefence the
|
|
scsi device; however, for other (non-SCSI) devices this
|
|
points to a totally different structure.
|
|
So we should rather be using accessors here which make
|
|
sure we're only returning valid SCSI device structures.
|
|
|
|
Signed-off-by: Hannes Reinecke <hare@suse.de>
|
|
|
|
---
|
|
drivers/scsi/device_handler/scsi_dh.c | 10 +++++-----
|
|
drivers/scsi/scsi_lib.c | 11 +++++++++++
|
|
include/scsi/scsi_device.h | 1 +
|
|
3 files changed, 17 insertions(+), 5 deletions(-)
|
|
|
|
--- a/drivers/scsi/device_handler/scsi_dh.c
|
|
+++ b/drivers/scsi/device_handler/scsi_dh.c
|
|
@@ -438,7 +438,7 @@ int scsi_dh_activate(struct request_queu
|
|
struct scsi_device_handler *scsi_dh = NULL;
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
- sdev = q->queuedata;
|
|
+ sdev = scsi_device_from_queue(q);
|
|
if (sdev && sdev->scsi_dh_data)
|
|
scsi_dh = sdev->scsi_dh_data->scsi_dh;
|
|
if (!scsi_dh || !get_device(&sdev->sdev_gendev))
|
|
@@ -500,7 +500,7 @@ int scsi_dh_handler_exist(const char *na
|
|
EXPORT_SYMBOL_GPL(scsi_dh_handler_exist);
|
|
|
|
/*
|
|
- * scsi_dh_handler_attach - Attach device handler
|
|
+ * scsi_dh_attach - Attach device handler
|
|
* @sdev - sdev the handler should be attached to
|
|
* @name - name of the handler to attach
|
|
*/
|
|
@@ -516,7 +516,7 @@ int scsi_dh_attach(struct request_queue
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
- sdev = q->queuedata;
|
|
+ sdev = scsi_device_from_queue(q);
|
|
if (!sdev || !get_device(&sdev->sdev_gendev))
|
|
err = -ENODEV;
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
@@ -530,7 +530,7 @@ int scsi_dh_attach(struct request_queue
|
|
EXPORT_SYMBOL_GPL(scsi_dh_attach);
|
|
|
|
/*
|
|
- * scsi_dh_handler_detach - Detach device handler
|
|
+ * scsi_dh_detach - Detach device handler
|
|
* @sdev - sdev the handler should be detached from
|
|
*
|
|
* This function will detach the device handler only
|
|
@@ -544,7 +544,7 @@ void scsi_dh_detach(struct request_queue
|
|
struct scsi_device_handler *scsi_dh = NULL;
|
|
|
|
spin_lock_irqsave(q->queue_lock, flags);
|
|
- sdev = q->queuedata;
|
|
+ sdev = scsi_device_from_queue(q);
|
|
if (!sdev || !get_device(&sdev->sdev_gendev))
|
|
sdev = NULL;
|
|
spin_unlock_irqrestore(q->queue_lock, flags);
|
|
--- a/drivers/scsi/scsi_lib.c
|
|
+++ b/drivers/scsi/scsi_lib.c
|
|
@@ -1595,6 +1595,17 @@ static void scsi_request_fn(struct reque
|
|
spin_lock_irq(q->queue_lock);
|
|
}
|
|
|
|
+struct scsi_device *scsi_device_from_queue(struct request_queue *q)
|
|
+{
|
|
+ struct scsi_device *sdev = NULL;
|
|
+
|
|
+ if (q->request_fn == scsi_request_fn)
|
|
+ sdev = q->queuedata;
|
|
+
|
|
+ return sdev;
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(scsi_device_from_queue);
|
|
+
|
|
u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost)
|
|
{
|
|
struct device *host_dev;
|
|
--- a/include/scsi/scsi_device.h
|
|
+++ b/include/scsi/scsi_device.h
|
|
@@ -297,6 +297,7 @@ extern void starget_for_each_device(stru
|
|
extern void __starget_for_each_device(struct scsi_target *, void *,
|
|
void (*fn)(struct scsi_device *,
|
|
void *));
|
|
+extern struct scsi_device *scsi_device_from_queue(struct request_queue *);
|
|
|
|
/* only exposed to implement shost_for_each_device */
|
|
extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
|