linux-kernel - Re: [PATCH] SCSI IOCTL: Check for device deletion [was Re: __elv_add

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Message-ID: <BANLkTimWPWc4k2_q0KZpmWo9G93UmVWoxA@mail.gmail.com>
Date:	Wed, 25 May 2011 13:03:38 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Parag Warudkar <parag.lkml@...il.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"James.Bottomley@...senpartnership.com" 
	<James.Bottomley@...senpartnership.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Linux SCSI List <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] SCSI IOCTL: Check for device deletion [was Re:
 __elv_add_request OOPS]

On Wed, May 25, 2011 at 12:52 PM, Parag Warudkar <parag.lkml@...il.com> wrote:
>
> +static inline int sdev_early_check(struct scsi_device *sdev)
> +{
> +       if (!sdev || sdev->sdev_state == SDEV_DEL
> +               || sdev->sdev_state > SDEV_QUIESCE)
> +               return -ENXIO;
> +       return 0;
> +}

Can somebody explain why it's those states, and nothing else?

Quite frankly, if it's about "don't oops on sdev->queue not existing",
then test for that. Not for some random and uncommented list of
states.

                          Linus
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