From: Majd Dibbiny <majd@mellanox.com>
To: SF Markus Elfring <elfring@users.sourceforge.net>
Cc: "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
Doug Ledford <dledford@redhat.com>,
Hal Rosenstock <hal.rosenstock@gmail.com>,
"Leon Romanovsky" <leonro@mellanox.com>,
Matan Barak <matanb@mellanox.com>,
"Sean Hefty" <sean.hefty@intel.com>,
Yishai Hadas <yishaih@mellanox.com>,
LKML <linux-kernel@vger.kernel.org>,
"kernel-janitors@vger.kernel.org"
<kernel-janitors@vger.kernel.org>
Subject: Re: [PATCH 13/29] IB/mlx4: Split a condition check in five functions
Date: Sun, 19 Feb 2017 17:21:53 +0000 [thread overview]
Message-ID: <B3B45072-167B-4013-92B8-A06AC5EFEDEE@mellanox.com> (raw)
In-Reply-To: <c2594ee3-ce5f-f86b-980c-098adf3e4609@users.sourceforge.net>
> On Feb 18, 2017, at 11:08 PM, SF Markus Elfring <elfring@users.sourceforge.net> wrote:
>
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Sat, 18 Feb 2017 14:43:34 +0100
>
> The kfree() function was called in up to two cases during error handling
> even if the passed variable contained a null pointer.
>
> * Split a condition check for memory allocation failures.
>
> * Adjust jump targets according to the Linux coding style convention.
>
> * Delete initialisations for variables at the beginning
> which became unnecessary with this refactoring.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
> drivers/infiniband/hw/mlx4/main.c | 90 +++++++++++++++++++++++++--------------
> 1 file changed, 59 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
> index b3b5ded85166..c0c299ffa0f6 100644
> --- a/drivers/infiniband/hw/mlx4/main.c
> +++ b/drivers/infiniband/hw/mlx4/main.c
> @@ -432,8 +432,8 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
> struct ib_udata *uhw)
> {
> struct mlx4_ib_dev *dev = to_mdev(ibdev);
> - struct ib_smp *in_mad = NULL;
> - struct ib_smp *out_mad = NULL;
> + struct ib_smp *in_mad;
> + struct ib_smp *out_mad;
> int err;
> int have_ib_ports;
> struct mlx4_uverbs_ex_query_device cmd;
> @@ -458,10 +458,14 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
> resp.response_length = offsetof(typeof(resp), response_length) +
> sizeof(resp.response_length);
> in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
> + if (!in_mad)
> + return -ENOMEM;
> +
> out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
> - err = -ENOMEM;
> - if (!in_mad || !out_mad)
> - goto out;
> + if (!out_mad) {
> + err = -ENOMEM;
> + goto free_in_mad;
> + }
>
> init_query_mad(in_mad);
> in_mad->attr_id = IB_SMP_ATTR_NODE_INFO;
> @@ -570,9 +574,9 @@ static int mlx4_ib_query_device(struct ib_device *ibdev,
> goto out;
> }
> out:
> - kfree(in_mad);
> kfree(out_mad);
> -
> +free_in_mad:
> + kfree(in_mad);
> return err;
> }
>
> @@ -588,16 +592,21 @@ mlx4_ib_port_link_layer(struct ib_device *device, u8 port_num)
> static int ib_link_query_port(struct ib_device *ibdev, u8 port,
> struct ib_port_attr *props, int netw_view)
> {
> - struct ib_smp *in_mad = NULL;
> - struct ib_smp *out_mad = NULL;
> + struct ib_smp *in_mad;
> + struct ib_smp *out_mad;
> int ext_active_speed;
> int mad_ifc_flags = MLX4_MAD_IFC_IGNORE_KEYS;
> - int err = -ENOMEM;
> + int err;
>
> in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
> + if (!in_mad)
> + return -ENOMEM;
> +
> out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
> - if (!in_mad || !out_mad)
> - goto out;
> + if (!out_mad) {
> + err = -ENOMEM;
> + goto free_in_mad;
> + }
>
> init_query_mad(in_mad);
> in_mad->attr_id = IB_SMP_ATTR_PORT_INFO;
> @@ -670,8 +679,9 @@ static int ib_link_query_port(struct ib_device *ibdev, u8 port,
> props->active_speed = IB_SPEED_SDR;
>
> out:
> - kfree(in_mad);
> kfree(out_mad);
> +free_in_mad:
> + kfree(in_mad);
> return err;
> }
>
> @@ -763,17 +773,22 @@ static int mlx4_ib_query_port(struct ib_device *ibdev, u8 port,
> int __mlx4_ib_query_gid(struct ib_device *ibdev, u8 port, int index,
> union ib_gid *gid, int netw_view)
> {
> - struct ib_smp *in_mad = NULL;
> - struct ib_smp *out_mad = NULL;
> - int err = -ENOMEM;
> + struct ib_smp *in_mad;
> + struct ib_smp *out_mad;
> + int err;
> struct mlx4_ib_dev *dev = to_mdev(ibdev);
> int clear = 0;
> int mad_ifc_flags = MLX4_MAD_IFC_IGNORE_KEYS;
>
> in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
> + if (!in_mad)
> + return -ENOMEM;
> +
> out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
> - if (!in_mad || !out_mad)
> - goto out;
> + if (!out_mad) {
> + err = -ENOMEM;
> + goto free_in_mad;
> + }
>
> init_query_mad(in_mad);
> in_mad->attr_id = IB_SMP_ATTR_PORT_INFO;
> @@ -811,8 +826,9 @@ int __mlx4_ib_query_gid(struct ib_device *ibdev, u8 port, int index,
> out:
> if (clear)
> memset(gid->raw + 8, 0, 8);
> - kfree(in_mad);
> kfree(out_mad);
> +free_in_mad:
> + kfree(in_mad);
> return err;
> }
>
> @@ -902,15 +918,20 @@ static void mlx4_init_sl2vl_tbl(struct mlx4_ib_dev *mdev)
> int __mlx4_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
> u16 *pkey, int netw_view)
> {
> - struct ib_smp *in_mad = NULL;
> - struct ib_smp *out_mad = NULL;
> + struct ib_smp *in_mad;
> + struct ib_smp *out_mad;
> int mad_ifc_flags = MLX4_MAD_IFC_IGNORE_KEYS;
> - int err = -ENOMEM;
> + int err;
>
> in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
> + if (!in_mad)
> + return -ENOMEM;
> +
> out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
> - if (!in_mad || !out_mad)
> - goto out;
> + if (!out_mad) {
> + err = -ENOMEM;
> + goto free_in_mad;
> + }
>
> init_query_mad(in_mad);
> in_mad->attr_id = IB_SMP_ATTR_PKEY_TABLE;
> @@ -927,8 +948,9 @@ int __mlx4_ib_query_pkey(struct ib_device *ibdev, u8 port, u16 index,
> *pkey = be16_to_cpu(((__be16 *) out_mad->data)[index % 32]);
>
> out:
> - kfree(in_mad);
> kfree(out_mad);
> +free_in_mad:
> + kfree(in_mad);
> return err;
> }
>
> @@ -2083,15 +2105,20 @@ static int mlx4_ib_mcg_detach(struct ib_qp *ibqp, union ib_gid *gid, u16 lid)
>
> static int init_node_data(struct mlx4_ib_dev *dev)
> {
> - struct ib_smp *in_mad = NULL;
> - struct ib_smp *out_mad = NULL;
> + struct ib_smp *in_mad;
> + struct ib_smp *out_mad;
> int mad_ifc_flags = MLX4_MAD_IFC_IGNORE_KEYS;
> - int err = -ENOMEM;
> + int err;
>
> in_mad = kzalloc(sizeof(*in_mad), GFP_KERNEL);
> + if (!in_mad)
> + return -ENOMEM;
> +
> out_mad = kmalloc(sizeof(*out_mad), GFP_KERNEL);
> - if (!in_mad || !out_mad)
> - goto out;
> + if (!out_mad) {
> + err = -ENOMEM;
> + goto free_in_mad;
> + }
>
> init_query_mad(in_mad);
> in_mad->attr_id = IB_SMP_ATTR_NODE_DESC;
> @@ -2114,8 +2141,9 @@ static int init_node_data(struct mlx4_ib_dev *dev)
> memcpy(&dev->ib_dev.node_guid, out_mad->data + 12, 8);
>
> out:
> - kfree(in_mad);
> kfree(out_mad);
> +free_in_mad:
> + kfree(in_mad);
> return err;
> }
>
> --
> 2.11.1
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Thanks,
Reviewed-by: Majd Dibbiny
<majd@mellanox.com>
next prev parent reply other threads:[~2017-02-19 17:22 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-18 20:45 [PATCH 00/29] IB/mlx: Fine-tuning for several function implementations SF Markus Elfring
2017-02-18 20:47 ` [PATCH 01/29] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv_bufs() SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:49 ` [PATCH 02/29] IB/mlx4: Improve another size determination " SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:50 ` [PATCH 03/29] IB/mlx4: Improve another size determination in mlx4_ib_alloc_demux_ctx() SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:51 ` [PATCH 04/29] IB/mlx4: Improve another size determination in alloc_pv_object() SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:52 ` [PATCH 05/29] IB/mlx4: Fix a typo in a comment line SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:54 ` [PATCH 06/29] IB/mlx4: Delete three unnecessary return statements SF Markus Elfring
2017-02-19 17:06 ` Majd Dibbiny
2017-02-18 20:55 ` [PATCH 07/29] IB/mlx4: Split a condition check in handle_slaves_guid_change() SF Markus Elfring
2017-02-19 17:09 ` Majd Dibbiny
2017-02-18 20:56 ` [PATCH 08/29] IB/mlx4: Delete an unnecessary check before the function call "kfree" in free_pv_object() SF Markus Elfring
2017-02-19 17:11 ` Majd Dibbiny
2017-02-18 20:57 ` [PATCH 09/29] IB/mlx4: Move an assignment out of a check in forward_trap() SF Markus Elfring
2017-02-19 17:12 ` Majd Dibbiny
2017-02-18 20:58 ` [PATCH 10/29] IB/mlx4: Enclose 15 expressions for the sizeof operator by parentheses SF Markus Elfring
2017-02-19 17:21 ` Majd Dibbiny
2017-02-18 20:59 ` [PATCH 11/29] IB/mlx4: Use kmalloc_array() in three functions SF Markus Elfring
2017-02-19 17:21 ` Majd Dibbiny
2017-02-18 21:00 ` [PATCH 12/29] IB/mlx4: Enclose 17 expressions for the sizeof operator by parentheses SF Markus Elfring
2017-02-19 17:21 ` Majd Dibbiny
2017-02-18 21:01 ` [PATCH 13/29] IB/mlx4: Split a condition check in five functions SF Markus Elfring
2017-02-19 17:21 ` Majd Dibbiny [this message]
2017-02-18 21:02 ` [PATCH 14/29] IB/mlx4: Delete an unnecessary variable in __mlx4_ib_query_gid() SF Markus Elfring
2017-02-18 21:03 ` [PATCH 15/29] IB/mlx4: Delete an unnecessary return statement in do_slave_init() SF Markus Elfring
2017-02-19 17:36 ` Majd Dibbiny
2017-02-18 21:04 ` [PATCH 16/29] IB/mlx4: Improve another size determination " SF Markus Elfring
2017-02-18 21:05 ` [PATCH 17/29] IB/mlx4: Improve another size determination in mlx4_ib_add() SF Markus Elfring
2017-02-19 17:36 ` Majd Dibbiny
2017-02-19 17:36 ` Majd Dibbiny
2017-02-18 21:06 ` [PATCH 18/29] IB/mlx4: Delete an unnecessary variable initialisation " SF Markus Elfring
2017-02-18 21:08 ` [PATCH 19/29] IB/mlx4: Delete an unnecessary variable assignment " SF Markus Elfring
2017-02-19 19:42 ` Majd Dibbiny
2017-02-18 21:10 ` [PATCH 20/29] IB/mlx4: Delete an error message for a failed memory allocation " SF Markus Elfring
2017-02-19 19:48 ` Majd Dibbiny
2017-02-18 21:11 ` [PATCH 21/29] IB/mlx4: Delete unnecessary braces " SF Markus Elfring
2017-02-19 19:51 ` Majd Dibbiny
2017-02-18 21:12 ` [PATCH 22/29] IB/mlx4: Use kmalloc_array() in alloc_proxy_bufs() SF Markus Elfring
2017-02-19 19:53 ` Majd Dibbiny
2017-02-18 21:13 ` [PATCH 23/29] IB/mlx4: Improve size determinations in create_qp_common() SF Markus Elfring
2017-02-19 19:54 ` Majd Dibbiny
2017-02-18 21:14 ` [PATCH 24/29] IB/mlx4: Delete unwanted spaces behind usages of the sizeof operator SF Markus Elfring
2017-02-18 21:15 ` [PATCH 25/29] IB/mlx4: Add spaces for better code readability SF Markus Elfring
2017-02-18 21:16 ` [PATCH 26/29] IB/mlx4: Enclose 14 expressions for the sizeof operator by parentheses SF Markus Elfring
2017-02-18 21:17 ` [PATCH 27/29] IB/mlx5: Use kmalloc_array() in create_kernel_qp() SF Markus Elfring
2017-02-18 21:18 ` [PATCH 28/29] IB/mlx5: Less function calls in create_kernel_qp() after error detection SF Markus Elfring
2017-02-18 21:19 ` [PATCH 29/29] IB/mlx5: Use kmalloc_array() in create_srq_kernel() SF Markus Elfring
2017-04-20 20:37 ` [PATCH 00/29] IB/mlx: Fine-tuning for several function implementations Doug Ledford
2017-04-20 21:02 ` SF Markus Elfring
2017-04-21 2:23 ` Doug Ledford
2017-04-21 18:17 ` [PATCH v2 00/17] " SF Markus Elfring
2017-04-21 18:21 ` [PATCH v2 01/17] IB/mlx4: Use kcalloc() in mlx4_ib_alloc_pv_bufs() SF Markus Elfring
2017-04-21 18:24 ` [PATCH v2 02/17] IB/mlx: Use kmalloc_array() in six functions SF Markus Elfring
2017-04-21 18:28 ` [PATCH v2 03/17] IB/mlx4: Improve size determinations " SF Markus Elfring
2017-04-21 18:29 ` [PATCH v2 00/17] IB/mlx: Fine-tuning for several function implementations Bart Van Assche
2017-04-21 19:21 ` SF Markus Elfring
2017-04-21 19:55 ` Bart Van Assche
2017-04-21 18:30 ` [PATCH v2 04/17] IB/mlx4: Fix a typo in a comment line SF Markus Elfring
2017-04-21 18:33 ` [PATCH v2 05/17] IB/mlx4: Delete four unnecessary return statements SF Markus Elfring
2017-04-21 18:36 ` [PATCH v2 06/17] IB/mlx4: Delete an unnecessary check before kfree() in free_pv_object() SF Markus Elfring
2017-04-21 18:37 ` [PATCH v2 07/17] IB/mlx4: Move an assignment out of a check in forward_trap() SF Markus Elfring
2017-04-21 18:38 ` [PATCH v2 08/17] IB/mlx4: Enclose 46 expressions for sizeof by parentheses SF Markus Elfring
2017-04-21 18:40 ` [PATCH v2 09/17] IB/mlx4: Split a condition check in six functions SF Markus Elfring
2017-04-21 18:42 ` [PATCH v2 10/17] IB/mlx4: Delete an unnecessary variable in __mlx4_ib_query_gid() SF Markus Elfring
2017-04-21 18:44 ` [PATCH v2 11/17] IB/mlx4: Delete an unnecessary variable initialisation in mlx4_ib_add() SF Markus Elfring
2017-04-21 18:45 ` [PATCH v2 12/17] IB/mlx4: Delete an unnecessary variable assignment " SF Markus Elfring
2017-04-21 18:46 ` [PATCH v2 13/17] IB/mlx4: Delete an error message for a failed memory allocation " SF Markus Elfring
2017-04-21 18:48 ` [PATCH v2 14/17] IB/mlx4: Delete unnecessary braces " SF Markus Elfring
2017-04-21 18:50 ` [PATCH v2 15/17] IB/mlx4: Delete unwanted spaces behind usages of the sizeof operator SF Markus Elfring
2017-04-21 18:54 ` [PATCH v2 16/17] IB/mlx4: Add spaces for better code readability SF Markus Elfring
2017-04-21 19:28 ` Joe Perches
2017-04-21 18:55 ` [PATCH v2 17/17] IB/mlx5: Less function calls in create_kernel_qp() after error detection SF Markus Elfring
2017-08-06 14:00 ` [PATCH v2 00/17] IB/mlx: Fine-tuning for several function implementations SF Markus Elfring
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=B3B45072-167B-4013-92B8-A06AC5EFEDEE@mellanox.com \
--to=majd@mellanox.com \
--cc=dledford@redhat.com \
--cc=elfring@users.sourceforge.net \
--cc=hal.rosenstock@gmail.com \
--cc=kernel-janitors@vger.kernel.org \
--cc=leonro@mellanox.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rdma@vger.kernel.org \
--cc=matanb@mellanox.com \
--cc=sean.hefty@intel.com \
--cc=yishaih@mellanox.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).