linux-kernel - Re: [PATCH v2 6/8] IB/hns: Replace counting semaphore event_sem with wait

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Date:   Tue, 25 Oct 2016 19:05:59 +0530
From:   Binoy Jayan <binoy.jayan@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        linux-rdma@...r.kernel.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 6/8] IB/hns: Replace counting semaphore event_sem with wait_event

On 25 October 2016 at 18:51, Arnd Bergmann <arnd@...db.de> wrote:
> On Tuesday, October 25, 2016 6:29:45 PM CEST Binoy Jayan wrote:
>
> Something like
>
> static struct hns_roce_cmd_context *hns_roce_try_get_context(struct hns_roce_cmdq *cmd)
> {
>         struct hns_roce_cmd_context *context = NULL;
>
>         spin_lock(&cmd->context_lock);
>
>         if (cmd->free_head < 0)
>                 goto out;
>
>         context = &cmd->context[cmd->free_head];
>
>         ... /* update free_head */
>
> out:
>         spin_unlock(&cmd->context_lock);
>
>         return context;
> }
> ...
>
> static struct hns_roce_cmd_context *hns_roce_get_context(struct hns_roce_cmdq *cmd)
> {
>         struct hns_roce_cmd_context *context;
>
>         wait_event(cmd->wq, (context = hns_roce_try_get_context(cmd)));
>
>         return context;
> }

That looks more elegant. Didn't think of that, Thank you Arnd.:)