linux-kernel - Re: [PATCH 1.1 1/1] arcmsr: Notify has sense data report

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Date:	Fri, 28 Nov 2014 11:14:53 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	Ching Huang <ching2048@...ca.com.tw>, hch@...radead.org,
	thenzl@...hat.com, jbottomley@...allels.com,
	dan.carpenter@...cle.com, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1.1 1/1]  arcmsr: Notify has sense data report

On 11/28/2014 11:07 AM, Ching Huang wrote:
> From: Ching Huang <ching2048@...ca.com.tw>
> 
> Setting command status with 'DRIVER_SENSE' except 'CHECK_CONDITION' if we have sense data.
> 
> Signed-off-by: Ching Huang <ching2048@...ca.com.tw>
> ---
> 
> This patch is relative to http://git.infradead.org/users/hch/scsi-queue.git/tree/refs/heads/drivers-for-3.18:/drivers/scsi/arcmsr
> 
> 
> diff -uprN a/drivers/scsi/arcmsr/arcmsr.h b/drivers/scsi/arcmsr/arcmsr.h
> --- a/drivers/scsi/arcmsr/arcmsr.h	2014-09-19 11:04:41.845100000 +0800
> +++ b/drivers/scsi/arcmsr/arcmsr.h	2014-11-28 10:54:30.000000000 +0800
> @@ -52,7 +52,7 @@ struct device_attribute;
>  	#define ARCMSR_MAX_FREECCB_NUM	320
>  #define ARCMSR_MAX_OUTSTANDING_CMD	255
>  #endif
> -#define ARCMSR_DRIVER_VERSION		"v1.30.00.04-20140919"
> +#define ARCMSR_DRIVER_VERSION		"v1.30.00.05-20141128"
>  #define ARCMSR_SCSI_INITIATOR_ID						255
>  #define ARCMSR_MAX_XFER_SECTORS							512
>  #define ARCMSR_MAX_XFER_SECTORS_B						4096
> diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
> --- a/drivers/scsi/arcmsr/arcmsr_hba.c	2014-09-19 11:01:26.990090000 +0800
> +++ b/drivers/scsi/arcmsr/arcmsr_hba.c	2014-11-28 17:51:04.000000000 +0800
> @@ -989,16 +989,15 @@ static void arcmsr_report_sense_info(str
>  
>  	struct scsi_cmnd *pcmd = ccb->pcmd;
>  	struct SENSE_DATA *sensebuffer = (struct SENSE_DATA *)pcmd->sense_buffer;
> -	pcmd->result = DID_OK << 16;
> -	if (sensebuffer) {
> -		int sense_data_length =
> +
> +	pcmd->result = (DRIVER_SENSE << 24) | (DID_OK << 16) | (CHECK_CONDITION << 1);
> +	int sense_data_length =
>  			sizeof(struct SENSE_DATA) < SCSI_SENSE_BUFFERSIZE
>  			? sizeof(struct SENSE_DATA) : SCSI_SENSE_BUFFERSIZE;
> -		memset(sensebuffer, 0, SCSI_SENSE_BUFFERSIZE);
> -		memcpy(sensebuffer, ccb->arcmsr_cdb.SenseData, sense_data_length);
> -		sensebuffer->ErrorCode = SCSI_SENSE_CURRENT_ERRORS;
> -		sensebuffer->Valid = 1;
> -	}
> +	memset(sensebuffer, 0, SCSI_SENSE_BUFFERSIZE);
> +	memcpy(sensebuffer, ccb->arcmsr_cdb.SenseData, sense_data_length);
> +	sensebuffer->ErrorCode = SCSI_SENSE_CURRENT_ERRORS;
> +	sensebuffer->Valid = 1;
>  }
>  
>  static u32 arcmsr_disable_outbound_ints(struct AdapterControlBlock *acb)
> 
> 
Hmm. Sorry to be picky, but:

Is there a chance the _no_ sense data will be provided?
If so we'd end up starting the error handler, calling REQUEST SENSE
(which will fail, too), and finally offlining the device.
I'd rather provide a default sense code for these cases.

Plus please use SAM_STAT_CHECK_CONDITION instead of
CHECK_CONDITION << 1.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 21284 (AG Nürnberg)
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