linux-kernel - Re: [PATCH 04/24] ide-tape: remove pipeline-specific code from idetape_chrdev

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Message-Id: <200803021941.28401.bzolnier@gmail.com>
Date:	Sun, 2 Mar 2008 19:41:28 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Borislav Petkov <petkovbb@...glemail.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Borislav Petkov <petkovbb@...il.com>
Subject: Re: [PATCH 04/24] ide-tape: remove pipeline-specific code from idetape_chrdev_write

On Saturday 01 March 2008, Borislav Petkov wrote:
> Also, remove unused stage-parameter from idetape_copy_stage_from_user()

Changes like this one are the best to put into separate patches
at the very beginning of the patch series.

> Signed-off-by: Borislav Petkov <petkovbb@...il.com>
> ---
>  drivers/ide/ide-tape.c |   15 ++++-----------
>  1 files changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
> index e919d41..4a064c1 100644
> --- a/drivers/ide/ide-tape.c
> +++ b/drivers/ide/ide-tape.c
> @@ -1700,7 +1700,7 @@ static idetape_stage_t *idetape_kmalloc_stage(idetape_tape_t *tape)
>  }
>  
>  static int idetape_copy_stage_from_user(idetape_tape_t *tape,
> -		idetape_stage_t *stage, const char __user *buf, int n)
> +					const char __user *buf, int n)
>  {
>  	struct idetape_bh *bh = tape->bh;
>  	int count;
> @@ -2696,8 +2696,6 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
>  
>  	/* Initialize write operation */
>  	if (tape->chrdev_dir != IDETAPE_DIR_WRITE) {
> -		if (tape->chrdev_dir == IDETAPE_DIR_READ)
> -			idetape_discard_read_pipeline(drive, 1);

Why this is OK thing to do?

Are you sure that there are no hidden side-effects?

>  		if (tape->merge_stage || tape->merge_stage_size) {
>  			printk(KERN_ERR "ide-tape: merge_stage_size "
>  				"should be 0 now\n");
> @@ -2729,8 +2727,6 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
>  	}
>  	if (count == 0)
>  		return (0);
> -	if (tape->restart_speed_control_req)
> -		idetape_restart_speed_control(drive);

ditto

tape->restart_speed_control_req can still be non-zero.
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