From 8889e3c129780cdbe15fed3c366ba3aa3026684d Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Tue, 18 Sep 2007 12:16:45 +0200 Subject: [PATCH] remove blk_queue_max_phys_segments in libata LIBATA_MAX_PRD is the maximum number of DMA scatter/gather elements permitted by the HBA's DMA engine. It's properly set to q->max_hw_segments via the sg_tablesize parameter. libata shouldn't call blk_queue_max_phys_segments. Now LIBATA_MAX_PRD is equal to SCSI_MAX_PHYS_SEGMENTS by default (both is 128), so everything is fine. But if they are changed, some code (like the scsi mid layer, sg chaining, etc) might not work properly. (Addition from Jens) The basic issue is that the physical segment setting is purely a driver issue. And since SCSI is managing the sglist, libata has no business changing the setting. All libata should care about is the hw segment setting. Signed-off-by: FUJITA Tomonori Signed-off-by: Jens Axboe --- drivers/ata/libata-scsi.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index d63c81ed084..ba62d534f32 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -801,8 +801,6 @@ int ata_scsi_slave_config(struct scsi_device *sdev) ata_scsi_sdev_config(sdev); - blk_queue_max_phys_segments(sdev->request_queue, LIBATA_MAX_PRD); - sdev->manage_start_stop = 1; if (dev) -- 2.20.1