netdev - Re: [PATCH net 1/1] qede: fix NULL pointer deref in __qede

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Date:   Fri, 08 Nov 2019 14:08:41 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     manishc@...vell.com
Cc:     netdev@...r.kernel.org, aelior@...vell.com, skalluru@...vell.com
Subject: Re: [PATCH net 1/1] qede: fix NULL pointer deref in __qede_remove()

From: Manish Chopra <manishc@...vell.com>
Date: Fri, 8 Nov 2019 02:42:30 -0800

> While rebooting the system with SR-IOV vfs enabled leads
> to below crash due to recurrence of __qede_remove() on the VF
> devices (first from .shutdown() flow of the VF itself and
> another from PF's .shutdown() flow executing pci_disable_sriov())
> 
> This patch adds a safeguard in __qede_remove() flow to fix this,
> so that driver doesn't attempt to remove "already removed" devices.
 ...
> Signed-off-by: Manish Chopra <manishc@...vell.com>
> Signed-off-by: Ariel Elior <aelior@...vell.com>
> Signed-off-by: Sudarsana Kalluru <skalluru@...vell.com>

There should probably be a cleaner, more structural, way to prevent
this sequence.

But for now this fix is good enough.

Applied and queued up for -stable.