linux-kernel - Re: [PATCH] ata: pata_buddha: pata_gayle: consolidate .sff_data_xfer around libata::ata_sff_data

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Date: Tue, 4 Jun 2024 22:29:00 +0200
From: Niklas Cassel <cassel@...nel.org>
To: Paolo Pisati <p.pisati@...il.com>
Cc: Sergey Shtylyov <s.shtylyov@....ru>,
	Damien Le Moal <dlemoal@...nel.org>,
	linux-m68k@...ts.linux-m68k.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ata: pata_buddha: pata_gayle: consolidate .sff_data_xfer
 around libata::ata_sff_data_xfer()

Hello Paolo,

On Tue, Jun 04, 2024 at 06:22:17PM +0200, Paolo Pisati wrote:
> pata_buddha_data_xfer(), pata_gayle_data_xfer() and ata_sff_data_xfer() are the
> same function, consolidate around libata::ata_sff_data_xfer().

Please avoid the C++ namespace operator,
just drop "libata::" here and in the subject.

Also please just split this into two patches, one per driver.


> 
> Signed-off-by: Paolo Pisati <p.pisati@...il.com>
> ---
>  drivers/ata/pata_buddha.c | 40 ++-------------------------------------
>  drivers/ata/pata_gayle.c  | 40 ++-------------------------------------
>  2 files changed, 4 insertions(+), 76 deletions(-)
> 
> diff --git a/drivers/ata/pata_buddha.c b/drivers/ata/pata_buddha.c
> index c36ee991d5e5..234278eb26e1 100644
> --- a/drivers/ata/pata_buddha.c
> +++ b/drivers/ata/pata_buddha.c
> @@ -60,42 +60,6 @@ static const struct scsi_host_template pata_buddha_sht = {
>  	ATA_PIO_SHT(DRV_NAME),
>  };
>  
> -/* FIXME: is this needed? */
> -static unsigned int pata_buddha_data_xfer(struct ata_queued_cmd *qc,
> -					 unsigned char *buf,
> -					 unsigned int buflen, int rw)
> -{
> -	struct ata_device *dev = qc->dev;
> -	struct ata_port *ap = dev->link->ap;
> -	void __iomem *data_addr = ap->ioaddr.data_addr;
> -	unsigned int words = buflen >> 1;
> -
> -	/* Transfer multiple of 2 bytes */
> -	if (rw == READ)
> -		raw_insw((u16 *)data_addr, (u16 *)buf, words);
> -	else
> -		raw_outsw((u16 *)data_addr, (u16 *)buf, words);
> -
> -	/* Transfer trailing byte, if any. */
> -	if (unlikely(buflen & 0x01)) {
> -		unsigned char pad[2] = { };
> -
> -		/* Point buf to the tail of buffer */
> -		buf += buflen - 1;
> -
> -		if (rw == READ) {
> -			raw_insw((u16 *)data_addr, (u16 *)pad, 1);
> -			*buf = pad[0];
> -		} else {
> -			pad[0] = *buf;
> -			raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
> -		}
> -		words++;
> -	}
> -
> -	return words << 1;
> -}
> -
>  /*
>   * Provide our own set_mode() as we don't want to change anything that has
>   * already been configured..
> @@ -131,7 +95,7 @@ static void pata_xsurf_irq_clear(struct ata_port *ap)
>  
>  static struct ata_port_operations pata_buddha_ops = {
>  	.inherits	= &ata_sff_port_ops,
> -	.sff_data_xfer	= pata_buddha_data_xfer,
> +	.sff_data_xfer	= ata_sff_data_xfer,

Since this driver inherits ata_sff_port_ops,
which sets .sff_data_xfer to ata_sff_data_xfer:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/ata/libata-sff.c?h=v6.10-rc2#n46

this line should not be needed.


>  	.sff_irq_check	= pata_buddha_irq_check,
>  	.cable_detect	= ata_cable_unknown,
>  	.set_mode	= pata_buddha_set_mode,
> @@ -139,7 +103,7 @@ static struct ata_port_operations pata_buddha_ops = {
>  
>  static struct ata_port_operations pata_xsurf_ops = {
>  	.inherits	= &ata_sff_port_ops,
> -	.sff_data_xfer	= pata_buddha_data_xfer,
> +	.sff_data_xfer	= ata_sff_data_xfer,
>  	.sff_irq_check	= pata_buddha_irq_check,
>  	.sff_irq_clear	= pata_xsurf_irq_clear,
>  	.cable_detect	= ata_cable_unknown,
> diff --git a/drivers/ata/pata_gayle.c b/drivers/ata/pata_gayle.c
> index 3bdbe2b65a2b..febffc36a18f 100644
> --- a/drivers/ata/pata_gayle.c
> +++ b/drivers/ata/pata_gayle.c
> @@ -38,42 +38,6 @@ static const struct scsi_host_template pata_gayle_sht = {
>  	ATA_PIO_SHT(DRV_NAME),
>  };
>  
> -/* FIXME: is this needed? */
> -static unsigned int pata_gayle_data_xfer(struct ata_queued_cmd *qc,
> -					 unsigned char *buf,
> -					 unsigned int buflen, int rw)
> -{
> -	struct ata_device *dev = qc->dev;
> -	struct ata_port *ap = dev->link->ap;
> -	void __iomem *data_addr = ap->ioaddr.data_addr;
> -	unsigned int words = buflen >> 1;
> -
> -	/* Transfer multiple of 2 bytes */
> -	if (rw == READ)
> -		raw_insw((u16 *)data_addr, (u16 *)buf, words);
> -	else
> -		raw_outsw((u16 *)data_addr, (u16 *)buf, words);
> -
> -	/* Transfer trailing byte, if any. */
> -	if (unlikely(buflen & 0x01)) {
> -		unsigned char pad[2] = { };
> -
> -		/* Point buf to the tail of buffer */
> -		buf += buflen - 1;
> -
> -		if (rw == READ) {
> -			raw_insw((u16 *)data_addr, (u16 *)pad, 1);
> -			*buf = pad[0];
> -		} else {
> -			pad[0] = *buf;
> -			raw_outsw((u16 *)data_addr, (u16 *)pad, 1);
> -		}
> -		words++;
> -	}
> -
> -	return words << 1;
> -}
> -
>  /*
>   * Provide our own set_mode() as we don't want to change anything that has
>   * already been configured..
> @@ -110,7 +74,7 @@ static void pata_gayle_irq_clear(struct ata_port *ap)
>  
>  static struct ata_port_operations pata_gayle_a1200_ops = {
>  	.inherits	= &ata_sff_port_ops,
> -	.sff_data_xfer	= pata_gayle_data_xfer,
> +	.sff_data_xfer	= ata_sff_data_xfer,

Same comment as for the other driver.


Kind regards,
Niklas