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scsi: fixup kernel warning during rmmod()

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Calling rmmod() on a FC driver will results in warnings like

WARNING: CPU: 60 PID: 14640 at fs/sysfs/group.c:237 device_del+0x54/0x240()
sysfs group ffffffff81eff140 not found for kobject '3:0:0:3'

The problem here is that during scsi_remove_target() we will iterate
over all devices, but fail to remove any of those as the call to
scsi_device_get() fails the check to module_is_live().  Hence the
devices will not be removed at this point, but all intermediate
structures like fc rport etc. will be.  Later on during
scsi_forget_host() the devices are removed for real, but the device
parent is already removed and causes this warning.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Kyle Fortin <kyle.fortin@oracle.com>
Tested-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Hannes Reinecke 2017-10-04 10:28:56 +02:00 committed by Martin K. Petersen
parent 88e65389fc
commit fbce4d97fd
1 changed files with 8 additions and 2 deletions
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10
drivers/scsi/scsi_sysfs.c
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@ -1376,13 +1376,19 @@ static void __scsi_remove_target(struct scsi_target *starget)
spin_lock_irqsave(shost->host_lock, flags);
restart:
list_for_each_entry(sdev, &shost->__devices, siblings) {
/*
* We cannot call scsi_device_get() here, as
* we might've been called from rmmod() causing
* scsi_device_get() to fail the module_is_live()
* check.
*/
if (sdev->channel != starget->channel ||
sdev->id != starget->id ||
scsi_device_get(sdev))
!get_device(&sdev->sdev_gendev))
continue;
spin_unlock_irqrestore(shost->host_lock, flags);
scsi_remove_device(sdev);
scsi_device_put(sdev);
put_device(&sdev->sdev_gendev);
spin_lock_irqsave(shost->host_lock, flags);
goto restart;
}