From: Andrew Vasquez <andrew.vasquez@xxxxxxxxxx>
Date: Mon, 8 Sep 2008 14:13:31 -0700
> That's odd, as fc_flush_work() is quite minimal:
>
> static void
> fc_flush_work(struct Scsi_Host *shost)
> {
> if (!fc_host_work_q(shost)) {
> printk(KERN_ERR
> "ERROR: FC host '%s' attempted to flush work, "
> "when no workqueue created.\n", shost->hostt->name);
> dump_stack();
> return;
> }
>
> flush_workqueue(fc_host_work_q(shost));
> }
>
> there's not much chance here for a NULL-dereference.
There are several.
In this particular case, looking at the instruction dump, it appears
to be shost->shost_data is NULL in this case, via the expansion of
fc_host_work_q which is defined as:
#define fc_host_work_q(x) \
(((struct fc_host_attrs *)(x)->shost_data)->work_q)
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