linux-kernel - Re: [PATCH] fastboot: Introduce an asynchronous function call mechanism

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Date:	Mon, 13 Oct 2008 10:15:03 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Arjan van de Ven" <arjan@...radead.org>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [PATCH] fastboot: Introduce an asynchronous function call mechanism

Hi Arjan,

On Mon, Oct 13, 2008 at 2:44 AM, Arjan van de Ven <arjan@...radead.org> wrote:
> +void call_async(int pool_number, int argc, ...)
> +{
> +       struct async_item *item;
> +       va_list ap;
> +
> +       if (argc > 4 || argc < 0) {
> +               WARN(1, KERN_ERR "Too many arguments to async function! Skipping...\n");
> +               return;
> +       }
> +
> +       item = kmalloc(sizeof(struct async_item), GFP_ATOMIC);

Why is there no check for NULL here?

> +       item->argument_count = argc;
> +       va_start(ap, argc);
> +       item->func = va_arg(ap, async_func_t_0);
> +       if (argc > 0)
> +               item->arg1 = va_arg(ap, void *);
> +       if (argc > 1)
> +               item->arg2 = va_arg(ap, void *);
> +       if (argc > 2)
> +               item->arg3 = va_arg(ap, void *);
> +       if (argc > 4)
> +               item->arg3 = va_arg(ap, void *);
> +       va_end(ap);
> +
> +       /* If we're not yet or no longer active, just process the work item in place */
> +       if (!async_active) {
> +               do_async_item(item);
> +               kfree(item);
> +               return;
> +       }
> +       spin_lock(&pool_lock);
> +       pool_count[pool_number]++;
> +       list_add_tail(&item->list, &list_pool[pool_number]);
> +       wake_up(&waitqueue_pool[pool_number]);
> +       spin_unlock(&pool_lock);
> +}
> +EXPORT_SYMBOL_GPL(call_async);
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