linux-kernel - RE: [50/75] mpt2sas crashes on shutdown

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Message-ID: <A6888A6805518E4EA4AF7072A28264A60481D5AAEC@inbmail02.lsi.com>
Date:	Wed, 4 Jan 2012 14:23:27 +0530
From:	"Nandigama, Nagalakshmi" <Nagalakshmi.Nandigama@....com>
To:	Greg KH <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>
CC:	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"alan@...rguk.ukuu.org.uk" <alan@...rguk.ukuu.org.uk>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	"Moore, Eric" <Eric.Moore@....com>
Subject: RE: [50/75] mpt2sas crashes on shutdown

Greg,
As a fix to this issue, I posted the patch "[PATCH] mpt2sas: Remove msix_table_backup which is required only for preproduction boards". The patch in this mail will not address the complete issue. 

Please revert back this patch and add the patch "[PATCH] mpt2sas: Remove msix_table_backup which is required only for preproduction boards" to the stable kernels 3.0 and 3.1.

Regards,
Nagalakshmi


-----Original Message-----
From: Greg KH [mailto:gregkh@...e.de] 
Sent: Wednesday, January 04, 2012 4:03 AM
To: linux-kernel@...r.kernel.org; stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org; akpm@...ux-foundation.org; alan@...rguk.ukuu.org.uk; linux-scsi@...r.kernel.org; Nandigama, Nagalakshmi; David S. Miller; Moore, Eric
Subject: [50/75] mpt2sas crashes on shutdown

3.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: David Miller <davem@...emloft.net>

[Fixed differently in 3.2]

The mpt2sas driver accesses I/O space as virtual addresses when
saving and restoring the MSIX table, this only works by luck on x86.

One needs to use the appropriate {read,write}{b,w,l}() APIs.

This is fixed in v3.2.x because all of this code got rewritten for
NUMA I/O support.

But both 3.0.x and 3.1.x still have this bug, and my Niagara sparc
machines crash on shutdown every single time due to this bug making my
-stable work more difficult than it needs to be.


Signed-off-by: David S. Miller <davem@...emloft.net>
Cc: Eric Moore <Eric.Moore@....com>
Cc: Nagalakshmi Nandigama <nagalakshmi.nandigama@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/mpt2sas/mpt2sas_base.c |    6 +++---
 drivers/scsi/mpt2sas/mpt2sas_base.h |    2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/scsi/mpt2sas/mpt2sas_base.c
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.c
@@ -1096,7 +1096,7 @@ _base_save_msix_table(struct MPT2SAS_ADA
 		return;
 
 	for (i = 0; i < ioc->msix_vector_count; i++)
-		ioc->msix_table_backup[i] = ioc->msix_table[i];
+		ioc->msix_table_backup[i] = readl(&ioc->msix_table[i]);
 }
 
 /**
@@ -1113,7 +1113,7 @@ _base_restore_msix_table(struct MPT2SAS_
 		return;
 
 	for (i = 0; i < ioc->msix_vector_count; i++)
-		ioc->msix_table[i] = ioc->msix_table_backup[i];
+		writel(ioc->msix_table_backup[i], &ioc->msix_table[i]);
 }
 
 /**
@@ -1144,7 +1144,7 @@ _base_check_enable_msix(struct MPT2SAS_A
 	/* get msix table  */
 	pci_read_config_dword(ioc->pdev, base + 4, &msix_table_offset);
 	msix_table_offset &= 0xFFFFFFF8;
-	ioc->msix_table = (u32 *)((void *)ioc->chip + msix_table_offset);
+	ioc->msix_table = ((void __iomem *)ioc->chip + msix_table_offset);
 
 	dinitprintk(ioc, printk(MPT2SAS_INFO_FMT "msix is supported, "
 	    "vector_count(%d), table_offset(0x%08x), table(%p)\n", ioc->name,
--- a/drivers/scsi/mpt2sas/mpt2sas_base.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_base.h
@@ -779,7 +779,7 @@ struct MPT2SAS_ADAPTER {
 
 	u8		msix_enable;
 	u16		msix_vector_count;
-	u32		*msix_table;
+	u32 __iomem	*msix_table;
 	u32		*msix_table_backup;
 	u32		ioc_reset_count;
 


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