netdev - Re: [PATCH net] net/mlx4_core: Fix Oops on reboot when SRIOV VFs are probed into the Host

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Date:	Mon, 02 Jun 2014 17:58:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bhelgaas@...gle.com
Cc:	weiyang@...ux.vnet.ibm.com, ogerlitz@...lanox.com,
	netdev@...r.kernel.org, amirv@...lanox.com,
	jackm@....mellanox.co.il
Subject: Re: [PATCH net] net/mlx4_core: Fix Oops on reboot when SRIOV VFs
 are probed into the Host

From: Bjorn Helgaas <bhelgaas@...gle.com>
Date: Mon, 2 Jun 2014 10:10:01 -0600

> Writing a driver is not an empirical process of trying things to see
> what works.  You need to actively design a consistent structure so you
> know why and when things are safe.  I object to gratuitous "dev ==
> NULL" checks because often they are just a way of patching up a driver
> design that isn't well thought-out.
> 
> As I wrote before:
> 
>   From the PCI core's perspective, after .probe() returns successfully,
>   we can call any driver entry point and pass the pci_dev to it, and
>   expect it to work.  Doing mlx4_remove_one() in mlx4_pci_err_detected()
>   sort of breaks that assumption because you clear out pci_drvdata().
>   Right now, the only other entry point mlx4 really implements is
>   mlx4_remove_one(), and it has a hack that tests whether pci_drvdata()
>   is NULL.  But that's ... a hack, and you'll have to do the same
>   if/when you implement suspend/resume/sriov_configure/etc.

Agreed.
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