netdev - Re: [PATCH net-next v5 03/13] net: wwan: t7xx: Add core components

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHNKnsStshsku4FyHaYGJm=HWXpJH1J6S5Zras4te0NgHr1oDw@mail.gmail.com>
Date:   Mon, 7 Mar 2022 05:44:12 +0300
From:   Sergey Ryazanov <ryazanov.s.a@...il.com>
To:     Ricardo Martinez <ricardo.martinez@...ux.intel.com>
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Johannes Berg <johannes@...solutions.net>,
        Loic Poulain <loic.poulain@...aro.org>,
        M Chetan Kumar <m.chetan.kumar@...el.com>,
        chandrashekar.devegowda@...el.com,
        Intel Corporation <linuxwwan@...el.com>,
        chiranjeevi.rapolu@...ux.intel.com,
        Haijun Liu (刘海军) 
        <haijun.liu@...iatek.com>, amir.hanania@...el.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        dinesh.sharma@...el.com, eliot.lee@...el.com,
        ilpo.johannes.jarvinen@...el.com, moises.veleta@...el.com,
        pierre-louis.bossart@...el.com, muralidharan.sethuraman@...el.com,
        Soumya.Prakash.Mishra@...el.com, sreehari.kancharla@...el.com,
        madhusmita.sahu@...el.com
Subject: Re: [PATCH net-next v5 03/13] net: wwan: t7xx: Add core components

On Thu, Feb 24, 2022 at 1:35 AM Ricardo Martinez
<ricardo.martinez@...ux.intel.com> wrote:
> From: Haijun Liu <haijun.liu@...iatek.com>
>
> Registers the t7xx device driver with the kernel. Setup all the core
> components: PCIe layer, Modem Host Cross Core Interface (MHCCIF),
> modem control operations, modem state machine, and build
> infrastructure.
>
> * PCIe layer code implements driver probe and removal.
> * MHCCIF provides interrupt channels to communicate events
>   such as handshake, PM and port enumeration.
> * Modem control implements the entry point for modem init,
>   reset and exit.
> * The modem status monitor is a state machine used by modem control
>   to complete initialization and stop. It is used also to propagate
>   exception events reported by other components.

[skipped]

> +static struct t7xx_modem *t7xx_md_alloc(struct t7xx_pci_dev *t7xx_dev)
> +{
> +       struct device *dev = &t7xx_dev->pdev->dev;
> +       struct t7xx_modem *md;
> +
> +       md = devm_kzalloc(dev, sizeof(*md), GFP_KERNEL);
> +       if (!md)
> +               return NULL;
> +
> +       md->t7xx_dev = t7xx_dev;
> +       t7xx_dev->md = md;
> +       md->core_md.ready = false;
> +       spin_lock_init(&md->exp_lock);
> +       md->handshake_wq = alloc_workqueue("%s", WQ_UNBOUND | WQ_MEM_RECLAIM | WQ_HIGHPRI,
> +                                          0, "md_hk_wq");
> +       if (!md->handshake_wq)
> +               return NULL;
> +
> +       INIT_WORK(&md->handshake_work, t7xx_md_hk_wq);
> +       return md;
> +}
> +
> +int t7xx_md_reset(struct t7xx_pci_dev *t7xx_dev)
> +{
> +       struct t7xx_modem *md = t7xx_dev->md;
> +
> +       md->md_init_finish = false;
> +       md->exp_id = 0;
> +       spin_lock_init(&md->exp_lock);

Looks like a duplicated initialization, the first time the lock was
initialized in the t7xx_md_alloc() above.

> +       t7xx_fsm_reset(md);
> +       t7xx_cldma_reset(md->md_ctrl[CLDMA_ID_MD]);
> +       md->md_init_finish = true;
> +       return 0;
> +}

[skipped]

> +void t7xx_pcie_set_mac_msix_cfg(struct t7xx_pci_dev *t7xx_dev, unsigned int irq_count)
> +{
> +       u32 val;
> +
> +       val = ffs(irq_count) * 2 - 1;

Move this initialization to the variable declaration.

> +       iowrite32(val, IREG_BASE(t7xx_dev) + T7XX_PCIE_CFG_MSIX);
> +}

--
Sergey