linux-kernel - Re: [PATCH] SH/Dreamcast - add support for GD-Rom device

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Message-Id: <1198929826.6278.11.camel@localhost.localdomain>
Date:	Sat, 29 Dec 2007 12:03:46 +0000
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	Joe Perches <joe@...ches.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-sh <linux-sh@...r.kernel.org>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH] SH/Dreamcast - add support for GD-Rom device


On Fri, 2007-12-28 at 17:57 -0800, Joe Perches wrote:

> 
> Perhaps (uncompiled/untested):
> 
>     Remove unnecessary parenthesis
>     Remove GDROM: prefix from sense_texts
>     Add function gdrom_data_request
>     Check sense_key against sense_text array size
> 
> Signed-off-by: Joe Perches <joe@...ches.com>
> ---
>  drivers/cdrom/gdrom.c |   53 ++++++++++++++++++++++++++----------------------
>  1 files changed, 29 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
> index 59d26e0..ab95438 100644
> --- a/drivers/cdrom/gdrom.c
> +++ b/drivers/cdrom/gdrom.c
> @@ -80,16 +80,15 @@ static const struct {
>  	int sense_key;
>  	const char * const text;
>  } sense_texts[] = {
> -	{NO_SENSE, "GDROM: OK"},
> -	{RECOVERED_ERROR, "GDROM: Recovered from error"},
> -	{NOT_READY, "GDROM: Device not ready"},
> -	{MEDIUM_ERROR, "GDROM: Disk not ready"},
> -	{HARDWARE_ERROR, "GDROM: Hardware error"},
> -	{ILLEGAL_REQUEST, "GDROM: Command has failed"},
> -	{UNIT_ATTENTION, "GDROM: Device needs attention - "
> -			 "disk may have been changed"},
> -	{DATA_PROTECT, "GDROM: Data protection error"},
> -	{ABORTED_COMMAND, "GDROM: Command aborted"},
> +	{NO_SENSE, "OK"},
> +	{RECOVERED_ERROR, "Recovered from error"},
> +	{NOT_READY, "Device not ready"},
> +	{MEDIUM_ERROR, "Disk not ready"},
> +	{HARDWARE_ERROR, "Hardware error"},
> +	{ILLEGAL_REQUEST, "Command has failed"},
> +	{UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
> +	{DATA_PROTECT, "Data protection error"},
> +	{ABORTED_COMMAND, "Command aborted"},
>  };

>  
>  /* reset the G1 bus */
> @@ -412,11 +416,13 @@ static int gdrom_getsense(short *bufstring)
>  		return -EIO;
>  	}
>  	sense_key = sense[1] & 0x0F;
> -	printk(KERN_INFO "%s\n", sense_texts[sense_key].text);
> +	if (sense_key < ARRAY_SIZE(sense_texts))
> +		printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
> +	else
> +		printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
>  
> -	if (bufstring)
> +	if (bufstring)			/* return additional sense data */
>  		memcpy(bufstring, &sense[4], 2);
> -					/* return additional sense data */
>  
>  	if (sense_key < 2)
>  		return 0;
> @@ -550,19 +556,18 @@ static void gdrom_readdisk_dma(struct work_struct *work)
>  		ctrl_outb(0, GDROM_INTSEC_REG);
>  		/* In multiple DMA transfers need to wait */
>  		timeout = jiffies + HZ / 2;
> -		while (gdrom_is_busy() && (time_before(jiffies, timeout)))
> +		while (gdrom_is_busy() && time_before(jiffies, timeout))
>  			cpu_relax();
>  		ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
>  		timeout = jiffies + HZ / 2;
> -		while (((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) != 8) &&
> -		       (time_before(jiffies, timeout)))
> -			cpu_relax(); /* wait for DRQ to be set to 1 */
> +		while (!gdrom_data_request() && time_before(jiffies, timeout))
> +			cpu_relax();
>  		gd.pending = 1;
>  		gd.transfer = 1;
>  		outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
>  		timeout = jiffies + HZ / 2;
> -		while ((ctrl_inb(GDROM_DMA_STATUS_REG)) &&
> -		       (time_before(jiffies, timeout)))
> +		while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
> +		       time_before(jiffies, timeout))
>  			cpu_relax();
>  		ctrl_outb(1, GDROM_DMA_STATUS_REG);
>  		/* 5 second error margin here seems more reasonable */
> 
> 
> -


This won't work see include/scsi/scsi.h


/*
*  SENSE KEYS
*/

#define NO_SENSE            0x00
#define RECOVERED_ERROR     0x01
#define NOT_READY           0x02
#define MEDIUM_ERROR        0x03
#define HARDWARE_ERROR      0x04
#define ILLEGAL_REQUEST     0x05
#define UNIT_ATTENTION      0x06
#define DATA_PROTECT        0x07
#define BLANK_CHECK         0x08
#define COPY_ABORTED        0x0a
#define ABORTED_COMMAND     0x0b
#define VOLUME_OVERFLOW     0x0d
#define MISCOMPARE          0x0e

(The GD device specs says it supports 0, 1, 2, 3,4, 5, 6, 7 and 0xB)

ie we could get a sense key of 0x0B which would be greater than the
array size. I think you'd have to hard code the limit.




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