linux-kernel - Re: IO errors after "block: remove bio_get_nr

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Date:	Mon, 21 Dec 2015 15:07:21 -0500
From:	Tejun Heo <tj@...nel.org>
To:	"Artem S. Tashkinov" <t.artem@...os.com>
Cc:	"Artem S. Tashkinov" <t.artem@...lcity.com>,
	Kent Overstreet <kent.overstreet@...il.com>,
	Christoph Hellwig <hch@....de>,
	Ming Lin <ming.l@....samsung.com>, Jens Axboe <axboe@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Whitehouse <swhiteho@...hat.com>,
	IDE-ML <linux-ide@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ming Lei <tom.leiming@...il.com>
Subject: Re: IO errors after "block: remove bio_get_nr_vecs()"

Hello, Artem.

Can you please apply the following patch on top and see whether
anything changes?  If it does make the issue go away, can you please
revert the ".can_queue" part and test again?

Thanks.

---
 drivers/ata/ahci.h    |    2 +-
 drivers/ata/libahci.c |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -365,7 +365,7 @@ extern struct device_attribute *ahci_sde
  */
 #define AHCI_SHT(drv_name)						\
 	ATA_NCQ_SHT(drv_name),						\
-	.can_queue		= AHCI_MAX_CMDS - 1,			\
+	.can_queue		= 1/*AHCI_MAX_CMDS - 1*/,		\
 	.sg_tablesize		= AHCI_MAX_SG,				\
 	.dma_boundary		= AHCI_DMA_BOUNDARY,			\
 	.shost_attrs		= ahci_shost_attrs,			\
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -420,7 +420,7 @@ void ahci_save_initial_config(struct dev
 		hpriv->saved_cap2 = cap2 = 0;
 
 	/* some chips have errata preventing 64bit use */
-	if ((cap & HOST_CAP_64) && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)) {
+	if ((cap & HOST_CAP_64)/* && (hpriv->flags & AHCI_HFLAG_32BIT_ONLY)*/) {
 		dev_info(dev, "controller can't do 64bit DMA, forcing 32bit\n");
 		cap &= ~HOST_CAP_64;
 	}

-- 
tejun
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