On Thu, Nov 11, 2021 at 10:33:41AM +0300, Dan Carpenter wrote:
> On Wed, Nov 10, 2021 at 02:31:47PM -0800, Mark Gross wrote:
> > On Wed, Nov 10, 2021 at 10:43:46AM +0300, Dan Carpenter wrote:
> > > This code should be using PTR_ERR() instead of IS_ERR(). And because
> > > it's using the wrong "dev->client" pointer, the IS_ERR() check will be
> > > false, meaning the function returns success.
> > >
> > > Fixes: 62f9529b8d5c ("platform/mellanox: mlxreg-lc: Add initial support for Nvidia line card devices")
> > > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> > > ---
> > > drivers/platform/mellanox/mlxreg-lc.c | 5 +++--
> > > 1 file changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/platform/mellanox/mlxreg-lc.c b/drivers/platform/mellanox/mlxreg-lc.c
> > > index 0b7f58feb701..c897a2f15840 100644
> > > --- a/drivers/platform/mellanox/mlxreg-lc.c
> > > +++ b/drivers/platform/mellanox/mlxreg-lc.c
> > > @@ -413,7 +413,7 @@ mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotpl
> > > int size)
> > > {
> > > struct mlxreg_hotplug_device *dev = devs;
> > > - int i;
> > > + int i, ret;
> > >
> > > /* Create static I2C device feeding by auxiliary or main power. */
> > > for (i = 0; i < size; i++, dev++) {
> > > @@ -423,6 +423,7 @@ mlxreg_lc_create_static_devices(struct mlxreg_lc *mlxreg_lc, struct mlxreg_hotpl
> > > dev->brdinfo->type, dev->nr, dev->brdinfo->addr);
> > >
> > > dev->adapter = NULL;
> > > + ret = PTR_ERR(dev->client);
> > ret is only set on this error path.
> > can we get to the return without setting ret?
> >
>
> No.
>
> :P
>
> There two ways to read that question is if the patch introduces an
> uninitialized variable bug and I would be super embarrassed if I did
> something like that with all the QC scripts that I have to prevent it.
> The other way to read that question is if it's possible to not introduce
> the "ret" variable but instead figure it out at the end. But the error
> code needs to be preserved at this point because we change change the
> "dev" pointer and set "dev->adapter" to NULL.
^^^^^^^^^^^^
I meant "dev->client" not "dev->adapter".
regards,
dan carpenter
