RE: [PATCH 1/1] scsi: megaraid_sas - Fix random failure of DCDB cmds with sense info

[Yang, Bo]

Matthew,

Thanks for your review.

We have a 32 bit application(s) (megaraid utility) that is used in both
x86 and x86_64.
For ia64, the application is built in ia64 environment.

The sense_ptr picked up from the ioc->frame.raw is a 32-bit value from
the application. When we make it "unsigned long*" it picks up a 64-bit
value & the copy_to_user fails. Without this fix the issue is seen in
x86_64 kernels. But for ia64 it is an unsigned long * value (8 bytes)
and so we need a compile time flag.
 
Regards,

Bo Yang

-----Original Message-----
From: Matthew Wilcox [mailto:matthew@xxxxxx] 
Sent: Tuesday, November 20, 2007 3:42 PM
To: Yang, Bo
Cc: linux-scsi@xxxxxxxxxxxxxxx; James.Bottomley@xxxxxxxxxxxx;
akpm@xxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Patro, Sumant; Kolli, Neela
Subject: Re: [PATCH 1/1] scsi: megaraid_sas - Fix random failure of DCDB
cmds with sense info

On Wed, Nov 21, 2007 at 08:40:56AM +0000, bo yang wrote:
> Sense buffer ptr data type in the ioctl path is reverted back to u32 *

> for x86 and x86_64 as in previous versions of driver. For IA64 it will

> be unsigned long *. Compile time flag added for ia64 for this.

This changelog tells us what you're doing, but not why you're doing it.
Why is it that ia64 is different from x86 and x86_64?  What should other
architectures be doing?  This patch really doesn't make any sense to me
at all; it should be doing the exact same thing on all three
architectures.

> Signed-off-by: Bo Yang <bo.yang@xxxxxxx>
> 
> ---
> Documentation/scsi/ChangeLog.megaraid_sas |   15 +++++++++++++++
> drivers/scsi/megaraid/megaraid_sas.c      |   14 ++++++++++----
> drivers/scsi/megaraid/megaraid_sas.h      |    6 +++---
>  3 files changed, 28 insertions(+), 7 deletions(-)
> 
> diff -rupN linux-2.6.22_orig/Documentation/scsi/ChangeLog.megaraid_sas
linux-2.6.22_new/Documentation/scsi/ChangeLog.megaraid_sas
> --- linux-2.6.22_orig/Documentation/scsi/ChangeLog.megaraid_sas
2007-11-20 17:50:13.000000000 -0500
> +++ linux-2.6.22_new/Documentation/scsi/ChangeLog.megaraid_sas
2007-11-20 21:37:16.000000000 -0500
> @@ -1,3 +1,18 @@
> +1 Release Date    : Thur. Nov. 19 16:30:43 PST 2007 -
> +			(emaild-id:megaraidlinux@xxxxxxx)
> +			Sumant Patro
> +			Bo Yang
> +
> +2 Current Version : 00.00.03.17-RC1
> +3 Older Version   : 00.00.03.16
> +
> +1. Fix random failure of DCDB cmds with sense info.
> +
> +Fix: 	sense buffer ptr data type in the ioctl path is reverted
back
> +	to u32 * for x86, x86_64 as in previous versions of driver.
> +	For IA64 it will be unsigned long *. Compile time flag added
> +	for ia64 for this.
> +
>  1 Release Date    : Thur. Nov. 07 16:30:43 PST 2007 -
>  			(emaild-id:megaraidlinux@xxxxxxx)
>  			Sumant Patro
> diff -rupN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c
linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c
> --- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.c
2007-11-20 17:50:13.000000000 -0500
> +++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.c
2007-11-20 17:50:13.000000000 -0500
> @@ -10,7 +10,7 @@
>   *	   2 of the License, or (at your option) any later version.
>   *
>   * FILE		: megaraid_sas.c
> - * Version	: v00.00.03.16-rc1
> + * Version	: v00.00.03.17-rc1
>   *
>   * Authors:
>   *	(email-id : megaraidlinux@xxxxxxx)
> @@ -3020,10 +3020,16 @@ megasas_mgmt_fw_ioctl(struct megasas_ins
>  		 * sense buffer address
>  		 */
>  		sense_buff = (unsigned long *) ((unsigned
long)ioc->frame.raw +
> -
ioc->sense_off);
> -
> -		if (copy_to_user((void __user *)(unsigned
long)(*sense_buff),
> +					ioc->sense_off);
> +		sense_ptr = (u32 *) ((unsigned long)ioc->frame.raw +
> +					ioc->sense_off);
> +#if defined(__ia64__)
> +		if (copy_to_user((void __user *)((unsigned
long)(*sense_buff)),
> +				sense, ioc->sense_len)) {
> +#else
> +		if (copy_to_user((void __user *)((unsigned
long)(*sense_ptr)),
>  				sense, ioc->sense_len)) {
> +#endif
>  			printk(KERN_ERR "megasas: Failed to copy out to
user "
>  					"sense data\n");
>  			error = -EFAULT;
> diff -rupN linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h
linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h
> --- linux-2.6.22_orig/drivers/scsi/megaraid/megaraid_sas.h
2007-11-20 17:50:13.000000000 -0500
> +++ linux-2.6.22_new/drivers/scsi/megaraid/megaraid_sas.h
2007-11-20 17:50:13.000000000 -0500
> @@ -18,9 +18,9 @@
>  /*
>   * MegaRAID SAS Driver meta data
>   */
> -#define MEGASAS_VERSION
"00.00.03.16-rc1"
> -#define MEGASAS_RELDATE				"Nov. 07, 2007"
> -#define MEGASAS_EXT_VERSION			"Thu. Nov. 07 10:09:32
PDT 2007"
> +#define MEGASAS_VERSION
"00.00.03.17-rc1"
> +#define MEGASAS_RELDATE				"Nov. 19, 2007"
> +#define MEGASAS_EXT_VERSION			"Mon. Nov. 19 10:09:32
PDT 2007"
>  
>  /*
>   * Device IDs
> 
> -
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