On Tue, Jun 02, 2020 at 12:27:24PM -0700, Nathan Chancellor wrote:
> On Tue, Jun 02, 2020 at 03:28:37PM +0300, Leon Romanovsky wrote:
> > From: Leon Romanovsky <leonro@xxxxxxxxxxxx>
> >
> > Clang warns:
> >
> > drivers/net/ethernet/mellanox/mlx5/core/main.c:1278:6: warning: variable
> > 'err' is used uninitialized whenever 'if' condition is true
> > [-Wsometimes-uninitialized]
> > if (!priv->dbg_root) {
> > ^~~~~~~~~~~~~~~
> > drivers/net/ethernet/mellanox/mlx5/core/main.c:1303:9: note:
> > uninitialized use occurs here
> > return err;
> > ^~~
> > drivers/net/ethernet/mellanox/mlx5/core/main.c:1278:2: note: remove the
> > 'if' if its condition is always false
> > if (!priv->dbg_root) {
> > ^~~~~~~~~~~~~~~~~~~~~~
> > drivers/net/ethernet/mellanox/mlx5/core/main.c:1259:9: note: initialize
> > the variable 'err' to silence this warning
> > int err;
> > ^
> > = 0
> > 1 warning generated.
> >
> > The check of returned value of debugfs_create_dir() is wrong because
> > by the design debugfs failures should never fail the driver and the
> > check itself was wrong too. The kernel compiled without CONFIG_DEBUG_FS
> > will return ERR_PTR(-ENODEV) and not NULL as expected.
> >
> > Fixes: 11f3b84d7068 ("net/mlx5: Split mdev init and pci init")
> > Link: https://github.com/ClangBuiltLinux/linux/issues/1042
> > Reported-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
> > Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
>
> Thanks! That's what I figured it should be.
>
> Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
>
> > ---
> > Original discussion:
> > https://lore.kernel.org/lkml/20200530055447.1028004-1-natechancellor@xxxxxxxxx
> > ---
> > drivers/net/ethernet/mellanox/mlx5/core/main.c | 5 -----
> > 1 file changed, 5 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > index df46b1fce3a7..110e8d277d15 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
> > @@ -1275,11 +1275,6 @@ static int mlx5_mdev_init(struct mlx5_core_dev *dev, int profile_idx)
> >
> > priv->dbg_root = debugfs_create_dir(dev_name(dev->device),
> > mlx5_debugfs_root);
> > - if (!priv->dbg_root) {
> > - dev_err(dev->device, "mlx5_core: error, Cannot create debugfs dir, aborting\n");
> > - goto err_dbg_root;
Actually, this removes the only use of err_dbg_root, so that should be
removed at the same time.
Cheers,
Nathan
> > - }
> > -
> > err = mlx5_health_init(dev);
> > if (err)
> > goto err_health_init;
> > --
> > 2.26.2
> >
