linux-kernel - Re: [patch 5/6] ide: fix races in handling of user-space SET XFER commands

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Message-Id: <20090623.164042.226354730.davem@davemloft.net>
Date:	Tue, 23 Jun 2009 16:40:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	bzolnier@...il.com
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 5/6] ide: fix races in handling of user-space SET XFER
 commands

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Date: Tue, 23 Jun 2009 23:35:51 +0200

I just noticed the following while re-reading this patch.

> @@ -322,10 +322,17 @@ static void ide_error_cmd(ide_drive_t *d
>  void ide_finish_cmd(ide_drive_t *drive, struct ide_cmd *cmd, u8 stat)
>  {
>  	struct request *rq = drive->hwif->rq;
> -	u8 err = ide_read_error(drive);
> +	u8 err = ide_read_error(drive), nsect = cmd->tf.nsect;
> +	u8 set_xfer = !!(cmd->tf_flags & IDE_TFLAG_SET_XFER);
>  

There is no reason to use 'u8' for set_xfer.  It's a boolean
so use 'bool' and then you can eliminate that "!!()" double
negate.

The only reason you would need that double-negate is because
cmd->tf_flags is a u16 and IDE_TFLAG_SET_XFER is in fact one
of those upper 8-bits.

Further confirming that a bool would be a better choice here.
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