From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: Christoph Hellwig <hch@lst.de>
Cc: jgarzik@pobox.com, linux-ide@vger.kernel.org, stable@kernel.org
Subject: Re: [PATCH] libata: fix ata_id_logical_per_physical_sectors
Date: Thu, 28 Jan 2010 13:56:21 +0300 [thread overview]
Message-ID: <4B616D55.6080802@ru.mvista.com> (raw)
In-Reply-To: <20100128104234.GA25693@lst.de>
Hello.
Christoph Hellwig wrote:
> The value we get from the low byte of the ATA_ID_SECTOR_SIZE word is not not
> a plain multiple, but the log of it, so fix the helper to give the correct
> answer. Without this we'll get an incorrect minimal I/O size in the block
> limits VPD page for 4k sector drives.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>
>
> Index: linux-2.6/include/linux/ata.h
> ===================================================================
> --- linux-2.6.orig/include/linux/ata.h 2010-01-28 11:17:41.968003842 +0100
> +++ linux-2.6/include/linux/ata.h 2010-01-28 11:20:02.355268610 +0100
> @@ -649,7 +649,7 @@ static inline int ata_id_has_large_logic
>
> static inline u8 ata_id_logical_per_physical_sectors(const u16 *id)
> {
> - return id[ATA_ID_SECTOR_SIZE] & 0xf;
> + return 1 << (id[ATA_ID_SECTOR_SIZE] & 0xf);
>
Will this still fit into u8?
WBR, Sergei
next prev parent reply other threads:[~2010-01-28 10:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-28 10:42 [PATCH] libata: fix ata_id_logical_per_physical_sectors Christoph Hellwig
2010-01-28 10:56 ` Sergei Shtylyov [this message]
2010-01-28 10:59 ` Christoph Hellwig
2010-01-28 12:30 ` [PATCH v2] " Christoph Hellwig
2010-02-03 17:37 ` Christoph Hellwig
2010-02-03 17:42 ` Jeff Garzik
2010-02-03 18:14 ` Martin K. Petersen
2010-02-03 18:17 ` Christoph Hellwig
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