From: Christoph Hellwig <hch@xxxxxx>
The I/O submission and completion pathes call into the device handler
without any synchronization agains detachment. So disallow detaching
device handlers at runtime.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
---
drivers/scsi/scsi_dh.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index 489083c..954ca5e 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -180,8 +180,10 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
/*
* Detach from a device handler
*/
- scsi_dh_handler_detach(sdev);
- err = 0;
+ sdev_printk(KERN_WARNING, sdev,
+ "can't detach handler %s.\n",
+ sdev->handler->name);
+ err = -EINVAL;
} else if (!strncmp(buf, "activate", 8)) {
/*
* Activate a device handler
--
1.8.5.6
--
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