From: Mike Christie <michaelc@xxxxxxxxxxx>
If a device goes offline while the device is opened then closed
while it is still offline, udev will remove the /dev/disk/by-id
link. If the device comes back and is set to running, userspace
is not notified, and the by-id link will not get remade.
This patch has scsi-ml send a KOBJ_CHANGE event so tools like udev
will know that it can being to use the device again. With this patch
udev see the KOBJ_CHANGE event and will reprobe the device and recreate a
/dev/disk/by-id link.
Signed-off-by: Mike Christie <michaelc@xxxxxxxxxxx>
---
drivers/scsi/scsi_lib.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 1a67302..237932f 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2061,6 +2061,7 @@ int
scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
{
enum scsi_device_state oldstate = sdev->sdev_state;
+ int change_evt = 0;
if (state == oldstate)
return 0;
@@ -2079,6 +2080,11 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
switch (oldstate) {
case SDEV_OFFLINE:
case SDEV_TRANSPORT_OFFLINE:
+ /*
+ * Notify userspace we can accept IO by sending
+ * change event.
+ */
+ change_evt = 1;
case SDEV_QUIESCE:
case SDEV_BLOCK:
case SDEV_CREATED:
@@ -2160,6 +2166,8 @@ scsi_device_set_state(struct scsi_device *sdev, enum scsi_device_state state)
}
sdev->sdev_state = state;
+ if (change_evt)
+ sdev_evt_send_simple(sdev, 0, GFP_ATOMIC);
return 0;
illegal:
--
1.7.7.6
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