linux-kernel - Re: [BUG] 2.6.24-git usb reset problems

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Message-ID: <Pine.LNX.4.44L0.0801291032210.4229-100000@iolanthe.rowland.org>
Date:	Tue, 29 Jan 2008 10:36:19 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Boaz Harrosh <bharrosh@...asas.com>
cc:	Greg KH <greg@...ah.com>, Jens Axboe <jens.axboe@...cle.com>,
	Matthew Dharm <mdharm-usb@...-eyed-alien.net>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>
Subject: Re: [BUG] 2.6.24-git usb reset problems

On Tue, 29 Jan 2008, Boaz Harrosh wrote:

> --- a/drivers/usb/storage/transport.c
> +++ b/drivers/usb/storage/transport.c
> @@ -462,18 +462,24 @@ static int usb_stor_bulk_transfer_sglist(struct us_data *us, unsigned int pipe,
>   * Common used function. Transfer a complete command
>   * via usb_stor_bulk_transfer_sglist() above. Set cmnd resid
>   */
> -int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
> -		      struct scsi_cmnd* srb)
> +int usb_stor_bulk_srb_length(struct us_data* us, unsigned int pipe,
> +		      struct scsi_cmnd* srb, unsigned length)
>  {
>  	unsigned int partial;
>  	int result = usb_stor_bulk_transfer_sglist(us, pipe, scsi_sglist(srb),
> -				      scsi_sg_count(srb), scsi_bufflen(srb),
> +				      scsi_sg_count(srb), length,
>  				      &partial);
>  
>  	scsi_set_resid(srb, scsi_bufflen(srb) - partial);
>  	return result;
>  }
>  
> +int usb_stor_bulk_srb(struct us_data* us, unsigned int pipe,
> +		struct scsi_cmnd* srb)
> +{
> +	return usb_stor_bulk_srb_length(us, pipe, srb, scsi_bufflen(srb));
> +}
> +

I don't like this patch very much.  Why add another layer of 
indirection when the two subroutines do hardly any work?  Leave 
usb_stor_bulk_srb() the way it was, and add usb_stor_bulk_srb_length() 
as a separate routine that simply calls usb_stor_bulk_transfer_sglist() 
and scsi_set_resid().

BTW, the standard coding style calls for a blank line after the list of 
local variables at the start of a function or block.

Alan Stern

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