linux-kernel - Re: [PATCH v2 1/2] ide/Falcon: Remove in

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Date:   Sat, 21 Nov 2020 13:44:24 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jens Axboe <axboe@...nel.dk>, tglx@...utronix.de
Subject: Re: [PATCH v2 1/2] ide/Falcon: Remove in_interrupt() usage.

On 2020-11-20 14:35:35 [-0800], Andrew Morton wrote:
> On Fri, 20 Nov 2020 10:24:20 +0100 Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:
> 
> > falconide_get_lock() is called by ide_lock_host() and its caller
> > (ide_issue_rq()) has already a might_sleep() check.
> > 
> > stdma_lock() has wait_event() which also has a might_sleep() check.
> > 
> > Remove the in_interrupt() check.
> > 
> > ...
> >
> > --- a/drivers/ide/falconide.c
> > +++ b/drivers/ide/falconide.c
> > @@ -51,8 +51,6 @@ static void falconide_release_lock(void)
> >  static void falconide_get_lock(irq_handler_t handler, void *data)
> >  {
> >  	if (falconide_intr_lock == 0) {
> > -		if (in_interrupt() > 0)
> > -			panic("Falcon IDE hasn't ST-DMA lock in interrupt");
> >  		stdma_lock(handler, data);
> >  		falconide_intr_lock = 1;
> >  	}
> 
> The current mainline falconide_get_lock() is very different:

I have this patch on-top of next-20201120 so it should apply. You
realize that the above hunk is against falconide_get_lock() while
the below is falconide_release_lock().
If there is something wrong with the patch (or its commit message) I'm
sorry but I don't understand your signal :)

> static void falconide_release_lock(void)
> {
> 	if (falconide_intr_lock == 0) {
> 		printk(KERN_ERR "%s: bug\n", __func__);
> 		return;
> 	}
> 	falconide_intr_lock = 0;
> 	stdma_release();
> }

Sebastian