[PATCH 1/3] hv: hv_util: move vmbus_open() to a later place
Dexuan Cui
decui at microsoft.com
Fri Jan 30 04:26:44 UTC 2015
> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuznets at redhat.com]
> Sent: Thursday, January 29, 2015 21:13 PM
> To: Dexuan Cui
> Cc: gregkh at linuxfoundation.org; linux-kernel at vger.kernel.org; driverdev-
> devel at linuxdriverproject.org; olaf at aepfle.de; apw at canonical.com;
> jasowang at redhat.com; KY Srinivasan; Haiyang Zhang
> Subject: Re: [PATCH 1/3] hv: hv_util: move vmbus_open() to a later place
>
> Dexuan Cui <decui at microsoft.com> writes:
>
> > Before the line vmbus_open() returns, srv->util_cb can be already running
> > and the variablies, like util_fw_version, are needed by the srv->util_cb.
> >
> > So we have to make sure the variables are initialized before the vmbus_open().
> >
> > CC: "K. Y. Srinivasan" <kys at microsoft.com>
> > Signed-off-by: Dexuan Cui <decui at microsoft.com>
>
> It is not said in the description but moving hv_set_drvdata() before
> vmbus_open() make sense in case probe and remove can collide (can
> they?).
I'm not so sure. In normal usages, the collision should be unlikely.
Anyway, the patch makes things better. :-)
>
> Reviewed-by: Vitaly Kuznetsov <vkuznets at redhat.com>
Thanks for the review!
Thanks,
-- Dexuan
> > ---
> > drivers/hv/hv_util.c | 11 ++++++-----
> > 1 file changed, 6 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
> > index 3b9c9ef..c5be773 100644
> > --- a/drivers/hv/hv_util.c
> > +++ b/drivers/hv/hv_util.c
> > @@ -340,12 +340,8 @@ static int util_probe(struct hv_device *dev,
> >
> > set_channel_read_state(dev->channel, false);
> >
> > - ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
> > - srv->util_cb, dev->channel);
> > - if (ret)
> > - goto error;
> > -
> > hv_set_drvdata(dev, srv);
> > +
> > /*
> > * Based on the host; initialize the framework and
> > * service version numbers we will negotiate.
> > @@ -365,6 +361,11 @@ static int util_probe(struct hv_device *dev,
> > hb_srv_version = HB_VERSION;
> > }
> >
> > + ret = vmbus_open(dev->channel, 4 * PAGE_SIZE, 4 * PAGE_SIZE, NULL, 0,
> > + srv->util_cb, dev->channel);
> > + if (ret)
> > + goto error;
> > +
> > return 0;
> >
> > error:
>
> --
> Vitaly
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