Re: [PATCH] libata: fix ata_id_logical_per_physical_sectors

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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@xxxxxx>

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


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