linux-kernel - Re: [PATCH] acpi: video: fix reversed indexed BQC

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Message-ID: <CAMP44s1A+z4=DGJLK1qf5LPc1vbYvtJwjFiMt17vzyZFRU0qmg@mail.gmail.com>
Date:	Thu, 1 Aug 2013 23:11:12 -0500
From:	Felipe Contreras <felipe.contreras@...il.com>
To:	Aaron Lu <aaron.lwe@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH] acpi: video: fix reversed indexed BQC

On Thu, Aug 1, 2013 at 9:03 PM, Aaron Lu <aaron.lwe@...il.com> wrote:
> On 08/02/2013 07:34 AM, Felipe Contreras wrote:
>> Commit 1a7c618 (ACPI video: support _BQC/_BCL/_BCM methods that use
>> index values) assumed that bl->levels were not reverted, but at this
>> point they already are, so there's no need to revert them yet again.
>
> When acpi_video_bqc_value_to_level is called, bl->levels is not
> reverted.

This is the code that turns br->flags._BCL_reversed on:

	if (max_level == br->levels[2]) {
		br->flags._BCL_reversed = 1;
		sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
			acpi_video_cmp_level, NULL);
	}

Now tell me how br->flags._BCL_reversed can be on, and the br->levels
*not* reverted.

-- 
Felipe Contreras
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