On Fri, 2017-12-01 at 16:40 +0800, Jason Yan wrote: > On 2017/12/1 7:56, James Bottomley wrote: > > b/include/scsi/scsi_device.h > > index 571ddb49b926..2e4d48d8cd68 100644 > > --- a/include/scsi/scsi_device.h > > +++ b/include/scsi/scsi_device.h > > @@ -380,6 +380,23 @@ extern struct scsi_device > > *__scsi_iterate_devices(struct Scsi_Host *, > > #define __shost_for_each_device(sdev, shost) \ > > list_for_each_entry((sdev), &((shost)->__devices), > > siblings) > > > > Seems that __shost_for_each_device() is still not safe. scsi device > been deleted stays in the list and put_device() can be called > anywhere out of the host lock. Not if it's used with scsi_get_device(). As I said, I only did a cursory inspectiont, so if I've missed a loop, please specify. The point was more a demonstration of how we could fix the problem if we don't change get_device(). James
