From: Tom Yan <tom.ty89@xxxxxxxxx>
As of commit 6b7e9cde4969 ("sd: Fix rw_max for devices that report
an optimal xfer size"), the scsi disk driver (correctly) derive both
of the queue limits "io_opt" and "max_sectors" from the optimal
transfer length field.
In case we would like the two limits to be derived from a value
other than BLK_DEF_MAX_SECTORS for ATA disks in the future, this
patch has made it easy.
Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index bfec66f..ab75b5e 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -2305,6 +2305,13 @@ static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
put_unaligned_be16(min_io_sectors, &rbuf[6]);
/*
+ * Optimal transfer length.
+ *
+ * This is used to derive the queue limit "max_sector" and "io_opt".
+ */
+ put_unaligned_be32(BLK_DEF_MAX_SECTORS, &rbuf[12]);
+
+ /*
* Optimal unmap granularity.
*
* The ATA spec doesn't even know about a granularity or alignment
--
2.9.0
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