driver/FSL SATA:Fix wrong Device Error Register usage

When a single device error is detected, the device under the error is indicated
by the error bit set in the DER. There is a one to one mapping between register
bit and devices on Port multiplier(PMP) i.e. bit 0 represents PMP device 0 and
bit 1 represents PMP device 1 etc.

Current implementation treats Device error register value as device number not
set of bits representing multiple device on PMP. It is changed to consider bit
level.
No need to check for each set bit as all command is going to be aborted.

Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Ashish Kalra <B00888@freescale.com>
---
 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git (branch master)

 This patch is already gone through review of linuxppc-dev mail list.

 drivers/ata/sata_fsl.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

Hello.

On 07.03.2011 6:57, Prabhakar Kushwaha wrote:

> When a single device error is detected, the device under the error is indicated
> by the error bit set in the DER. There is a one to one mapping between register
> bit and devices on Port multiplier(PMP) i.e. bit 0 represents PMP device 0 and
> bit 1 represents PMP device 1 etc.

> Current implementation treats Device error register value as device number not
> set of bits representing multiple device on PMP. It is changed to consider bit
> level.
> No need to check for each set bit as all command is going to be aborted.

> Signed-off-by: Prabhakar Kushwaha<prabhakar@freescale.com>
> Signed-off-by: Ashish Kalra<B00888@freescale.com>
> ---
>   git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git (branch master)

>   This patch is already gone through review of linuxppc-dev mail list.

>   drivers/ata/sata_fsl.c |    6 ++++--
>   1 files changed, 4 insertions(+), 2 deletions(-)

> diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c
> index b0214d0..895771c 100644
> --- a/drivers/ata/sata_fsl.c
> +++ b/drivers/ata/sata_fsl.c
> @@ -1040,12 +1040,14 @@ static void sata_fsl_error_intr(struct ata_port *ap)
>
>   		/* find out the offending link and qc */
>   		if (ap->nr_pmp_links) {
> +			unsigned int dev_num;

    Empty line wouldn't hurt here.

>   			dereg = ioread32(hcr_base + DE);
>   			iowrite32(dereg, hcr_base + DE);
>   			iowrite32(cereg, hcr_base + CE);
>
> -			if (dereg<  ap->nr_pmp_links) {
> -				link =&ap->pmp_link[dereg];
> +			dev_num = ffs(dereg)-1;

    What if no bit is set and ffs() return 0?
    Put spaces around - to keep the style consistent.

> +			if (dev_num < ap->nr_pmp_links) {
> +				link =&ap->pmp_link[dev_num];
>   				ehi =&link->eh_info;
>   				qc = ata_qc_from_tag(ap, link->active_tag);
>   				/*

WBR, Sergei
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