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libata: Check log page directory before accessing pages

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When reading the NCQ Send/Recv log it might actually not
supported, thereby causing irritating messages
'READ LOG DMA EXT failed'.
Instead we should be reading the log directory first to
figure out if the log is actually supported before trying
to access it.

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Hannes Reinecke
2016-04-25 12:45:48 +02:00
committed by Tejun Heo
parent 5c65d8bb35
commit fe5af0cc30
2 changed files with 18 additions and 0 deletions
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include/linux/ata.h
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@@ -314,6 +314,7 @@ enum {
ATA_SUBCMD_FPDMA_SEND_WR_LOG_DMA_EXT = 0x02,
/* READ_LOG_EXT pages */
ATA_LOG_DIRECTORY = 0x0,
ATA_LOG_SATA_NCQ = 0x10,
ATA_LOG_NCQ_SEND_RECV = 0x13,
ATA_LOG_SATA_ID_DEV_DATA = 0x30,