Re: [Xen-devel] [PATCH] xen-netback: fix a BUG() during initialization

[David Miller <davem@xxxxxxxxxxxxx>]

From: Imre Palik <imrep.amz@xxxxxxxxx>
Date: Fri, 19 Jun 2015 14:21:51 +0200

> From: "Palik, Imre" <imrep@xxxxxxxxx>
> 
> Commit edafc132baac ("xen-netback: making the bandwidth limiter runtime 
> settable")
> introduced the capability to change the bandwidth rate limit at runtime.
> But it also introduced a possible crashing bug.
> 
> If netback receives two XenbusStateConnected without getting the
> hotplug-status watch firing in between, then it will try to register the
> watches for the rate limiter again.  But this triggers a BUG() in the watch
> registration code.
> 
> The fix modifies connect() to remove the possibly existing packet-rate
> watches before trying to install those watches.  This behaviour is in line
> with how connect() deals with the hotplug-status watch.
> 
> Signed-off-by: Imre Palik <imrep@xxxxxxxxx>
> Cc: Matt Wilson <msw@xxxxxxxxxx>

Applied, thank you.

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