On Tue, Sep 23, 2014 at 09:35:41AM +0200, Johan Hovold wrote:
> On Mon, Sep 22, 2014 at 10:39:18PM +0300, Octavian Purdila wrote:
> > Currently the I/O buffer is allocated part of the device status
> > structure, potentially sharing the same cache line with other members
> > in this structure.
> >
> > Allocate the buffer separately, to avoid the I/O operations corrupting
> > the device status structure due to cache line sharing.
> >
> > Compiled tested only as I don't have access to hardware.
> >
> > Signed-off-by: Octavian Purdila <octavian.purdila@xxxxxxxxx>
> > ---
> > drivers/mfd/viperboard.c | 8 ++++++++
> > include/linux/mfd/viperboard.h | 2 +-
> > 2 files changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mfd/viperboard.c b/drivers/mfd/viperboard.c
> > index e00f534..5f62f4e 100644
> > --- a/drivers/mfd/viperboard.c
> > +++ b/drivers/mfd/viperboard.c
> > @@ -64,6 +64,12 @@ static int vprbrd_probe(struct usb_interface *interface,
> > return -ENOMEM;
> > }
> >
> > + vb->buf = kzalloc(sizeof(struct vprbrd_i2c_write_msg), GFP_KERNEL);
> > + if (vb->buf == NULL) {
> > + ret = -ENOMEM;
> > + goto error;
>
> This will cause a kref imbalance as you have a usb_put_dev in error,
> but haven't done the get yet.
Nevermind. This isn't problem as the usb device is null.
Haven't had my morning coffee yet. ;)
Johan
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