linux-kernel - Re: [PATCH 4/9] USB: Convert from tasklet to BH workqueue

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Message-ID: <42c445b4-a156-4c43-bf98-bd2a9ac7a4fa@rowland.harvard.edu>
Date: Wed, 27 Mar 2024 13:55:00 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Allen Pais <apais@...ux.microsoft.com>
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Subject: Re: [PATCH 4/9] USB: Convert from tasklet to BH workqueue

On Wed, Mar 27, 2024 at 04:03:09PM +0000, Allen Pais wrote:
> The only generic interface to execute asynchronously in the BH context is
> tasklet; however, it's marked deprecated and has some design flaws. To
> replace tasklets, BH workqueue support was recently added. A BH workqueue
> behaves similarly to regular workqueues except that the queued work items
> are executed in the BH context.
> 
> This patch converts drivers/infiniband/* from tasklet to BH workqueue.
> 
> Based on the work done by Tejun Heo <tj@...nel.org>
> Branch: https://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-6.10
> 
> Signed-off-by: Allen Pais <allen.lkml@...il.com>
> ---

> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> index c0e005670d67..88d8e1c366cd 100644
> --- a/drivers/usb/core/hcd.c
> +++ b/drivers/usb/core/hcd.c

> @@ -1662,10 +1663,9 @@ static void __usb_hcd_giveback_urb(struct urb *urb)
>  	usb_put_urb(urb);
>  }
>  
> -static void usb_giveback_urb_bh(struct work_struct *work)
> +static void usb_giveback_urb_bh(struct work_struct *t)
>  {
> -	struct giveback_urb_bh *bh =
> -		container_of(work, struct giveback_urb_bh, bh);
> +	struct giveback_urb_bh *bh = from_work(bh, t, bh);
>  	struct list_head local_list;
>  
>  	spin_lock_irq(&bh->lock);

Is there any reason for this apparently pointless change of a local
variable's name?

Alan Stern