* [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
@ 2021-04-20 7:00 wangyunjian
2021-04-20 7:09 ` Zhu Yanjun
2021-05-04 7:27 ` Leon Romanovsky
0 siblings, 2 replies; 6+ messages in thread
From: wangyunjian @ 2021-04-20 7:00 UTC (permalink / raw)
To: kuba, davem; +Cc: saeedm, netdev, dingxiaoxiong, Yunjian Wang
From: Yunjian Wang <wangyunjian@huawei.com>
The 'comps' struct field in 'moder' is not being initialized in
mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
So initialize 'moder' to zero to avoid the issue.
Addresses-Coverity: ("Uninitialized scalar variable")
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
---
v2: update mlx5e_get_def_tx_moderation() also needs fixing
---
drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
index 5db63b9f3b70..17a817b7e539 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
@@ -4868,7 +4868,7 @@ static bool slow_pci_heuristic(struct mlx5_core_dev *mdev)
static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
{
- struct dim_cq_moder moder;
+ struct dim_cq_moder moder = {};
moder.cq_period_mode = cq_period_mode;
moder.pkts = MLX5E_PARAMS_DEFAULT_TX_CQ_MODERATION_PKTS;
@@ -4881,7 +4881,7 @@ static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
static struct dim_cq_moder mlx5e_get_def_rx_moderation(u8 cq_period_mode)
{
- struct dim_cq_moder moder;
+ struct dim_cq_moder moder = {};
moder.cq_period_mode = cq_period_mode;
moder.pkts = MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_PKTS;
--
2.23.0
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
2021-04-20 7:00 [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps wangyunjian
@ 2021-04-20 7:09 ` Zhu Yanjun
2021-04-20 9:21 ` Leon Romanovsky
2021-05-04 7:27 ` Leon Romanovsky
1 sibling, 1 reply; 6+ messages in thread
From: Zhu Yanjun @ 2021-04-20 7:09 UTC (permalink / raw)
To: wangyunjian
Cc: Jakub Kicinski, David S. Miller, saeedm, netdev, dingxiaoxiong
On Tue, Apr 20, 2021 at 3:01 PM wangyunjian <wangyunjian@huawei.com> wrote:
>
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> The 'comps' struct field in 'moder' is not being initialized in
> mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
> So initialize 'moder' to zero to avoid the issue.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
> v2: update mlx5e_get_def_tx_moderation() also needs fixing
> ---
> drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> index 5db63b9f3b70..17a817b7e539 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> @@ -4868,7 +4868,7 @@ static bool slow_pci_heuristic(struct mlx5_core_dev *mdev)
>
> static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
> {
> - struct dim_cq_moder moder;
> + struct dim_cq_moder moder = {};
If I remember correctly, some gcc compiler will report errors about this "{}".
Zhu Yanjun
>
> moder.cq_period_mode = cq_period_mode;
> moder.pkts = MLX5E_PARAMS_DEFAULT_TX_CQ_MODERATION_PKTS;
> @@ -4881,7 +4881,7 @@ static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
>
> static struct dim_cq_moder mlx5e_get_def_rx_moderation(u8 cq_period_mode)
> {
> - struct dim_cq_moder moder;
> + struct dim_cq_moder moder = {};
>
> moder.cq_period_mode = cq_period_mode;
> moder.pkts = MLX5E_PARAMS_DEFAULT_RX_CQ_MODERATION_PKTS;
> --
> 2.23.0
>
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
2021-04-20 7:09 ` Zhu Yanjun
@ 2021-04-20 9:21 ` Leon Romanovsky
2021-04-20 9:28 ` Zhu Yanjun
0 siblings, 1 reply; 6+ messages in thread
From: Leon Romanovsky @ 2021-04-20 9:21 UTC (permalink / raw)
To: Zhu Yanjun, wangyunjian
Cc: Jakub Kicinski, David S. Miller, saeedm, netdev, dingxiaoxiong
On Tue, Apr 20, 2021 at 03:09:03PM +0800, Zhu Yanjun wrote:
> On Tue, Apr 20, 2021 at 3:01 PM wangyunjian <wangyunjian@huawei.com> wrote:
> >
> > From: Yunjian Wang <wangyunjian@huawei.com>
> >
> > The 'comps' struct field in 'moder' is not being initialized in
> > mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
> > So initialize 'moder' to zero to avoid the issue.
Please state that it is false alarm and this patch doesn't fix anything
except broken static analyzer tool.
> >
> > Addresses-Coverity: ("Uninitialized scalar variable")
> > Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> > ---
> > v2: update mlx5e_get_def_tx_moderation() also needs fixing
> > ---
> > drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > index 5db63b9f3b70..17a817b7e539 100644
> > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > @@ -4868,7 +4868,7 @@ static bool slow_pci_heuristic(struct mlx5_core_dev *mdev)
> >
> > static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
> > {
> > - struct dim_cq_moder moder;
>
> > + struct dim_cq_moder moder = {};
>
> If I remember correctly, some gcc compiler will report errors about this "{}".
Kernel doesn't support such compilers.
Thanks
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
2021-04-20 9:21 ` Leon Romanovsky
@ 2021-04-20 9:28 ` Zhu Yanjun
2021-04-20 11:05 ` Leon Romanovsky
0 siblings, 1 reply; 6+ messages in thread
From: Zhu Yanjun @ 2021-04-20 9:28 UTC (permalink / raw)
To: Leon Romanovsky
Cc: wangyunjian, Jakub Kicinski, David S. Miller, saeedm, netdev,
dingxiaoxiong
On Tue, Apr 20, 2021 at 5:21 PM Leon Romanovsky <leon@kernel.org> wrote:
>
> On Tue, Apr 20, 2021 at 03:09:03PM +0800, Zhu Yanjun wrote:
> > On Tue, Apr 20, 2021 at 3:01 PM wangyunjian <wangyunjian@huawei.com> wrote:
> > >
> > > From: Yunjian Wang <wangyunjian@huawei.com>
> > >
> > > The 'comps' struct field in 'moder' is not being initialized in
> > > mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
> > > So initialize 'moder' to zero to avoid the issue.
>
> Please state that it is false alarm and this patch doesn't fix anything
> except broken static analyzer tool.
>
> > >
> > > Addresses-Coverity: ("Uninitialized scalar variable")
> > > Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> > > ---
> > > v2: update mlx5e_get_def_tx_moderation() also needs fixing
> > > ---
> > > drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > index 5db63b9f3b70..17a817b7e539 100644
> > > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > @@ -4868,7 +4868,7 @@ static bool slow_pci_heuristic(struct mlx5_core_dev *mdev)
> > >
> > > static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
> > > {
> > > - struct dim_cq_moder moder;
> >
> > > + struct dim_cq_moder moder = {};
> >
> > If I remember correctly, some gcc compiler will report errors about this "{}".
>
> Kernel doesn't support such compilers.
Are you sure? Why are you so confirmative?
Zhu Yanjun
>
> Thanks
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
2021-04-20 9:28 ` Zhu Yanjun
@ 2021-04-20 11:05 ` Leon Romanovsky
0 siblings, 0 replies; 6+ messages in thread
From: Leon Romanovsky @ 2021-04-20 11:05 UTC (permalink / raw)
To: Zhu Yanjun
Cc: wangyunjian, Jakub Kicinski, David S. Miller, saeedm, netdev,
dingxiaoxiong
On Tue, Apr 20, 2021 at 05:28:43PM +0800, Zhu Yanjun wrote:
> On Tue, Apr 20, 2021 at 5:21 PM Leon Romanovsky <leon@kernel.org> wrote:
> >
> > On Tue, Apr 20, 2021 at 03:09:03PM +0800, Zhu Yanjun wrote:
> > > On Tue, Apr 20, 2021 at 3:01 PM wangyunjian <wangyunjian@huawei.com> wrote:
> > > >
> > > > From: Yunjian Wang <wangyunjian@huawei.com>
> > > >
> > > > The 'comps' struct field in 'moder' is not being initialized in
> > > > mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
> > > > So initialize 'moder' to zero to avoid the issue.
> >
> > Please state that it is false alarm and this patch doesn't fix anything
> > except broken static analyzer tool.
> >
> > > >
> > > > Addresses-Coverity: ("Uninitialized scalar variable")
> > > > Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> > > > ---
> > > > v2: update mlx5e_get_def_tx_moderation() also needs fixing
> > > > ---
> > > > drivers/net/ethernet/mellanox/mlx5/core/en_main.c | 4 ++--
> > > > 1 file changed, 2 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > > index 5db63b9f3b70..17a817b7e539 100644
> > > > --- a/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > > +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_main.c
> > > > @@ -4868,7 +4868,7 @@ static bool slow_pci_heuristic(struct mlx5_core_dev *mdev)
> > > >
> > > > static struct dim_cq_moder mlx5e_get_def_tx_moderation(u8 cq_period_mode)
> > > > {
> > > > - struct dim_cq_moder moder;
> > >
> > > > + struct dim_cq_moder moder = {};
> > >
> > > If I remember correctly, some gcc compiler will report errors about this "{}".
> >
> > Kernel doesn't support such compilers.
>
> Are you sure? Why are you so confirmative?
Yes, I'm sure.
Please read this whole discussion, I hope that it will answer your
question on why I'm so sure.
https://lore.kernel.org/linux-rdma/20200730192026.110246-1-yepeilin.cs@gmail.com/
>
> Zhu Yanjun
>
> >
> > Thanks
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps
2021-04-20 7:00 [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps wangyunjian
2021-04-20 7:09 ` Zhu Yanjun
@ 2021-05-04 7:27 ` Leon Romanovsky
1 sibling, 0 replies; 6+ messages in thread
From: Leon Romanovsky @ 2021-05-04 7:27 UTC (permalink / raw)
To: wangyunjian; +Cc: kuba, davem, saeedm, netdev, dingxiaoxiong
On Tue, Apr 20, 2021 at 03:00:26PM +0800, wangyunjian wrote:
> From: Yunjian Wang <wangyunjian@huawei.com>
>
> The 'comps' struct field in 'moder' is not being initialized in
> mlx5e_get_def_rx_moderation() and mlx5e_get_def_tx_moderation().
> So initialize 'moder' to zero to avoid the issue.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
> ---
> v2: update mlx5e_get_def_tx_moderation() also needs fixing
Actually grep other all "struct dim_cq_moder ...;" declarations shows
many places like this. Are you going to change them too?
Thanks
^ permalink raw reply [flat|nested] 6+ messages in thread
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2021-04-20 7:00 [PATCH net-next v2] net/mlx5e: Fix uninitialised struct field moder.comps wangyunjian
2021-04-20 7:09 ` Zhu Yanjun
2021-04-20 9:21 ` Leon Romanovsky
2021-04-20 9:28 ` Zhu Yanjun
2021-04-20 11:05 ` Leon Romanovsky
2021-05-04 7:27 ` Leon Romanovsky
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