netdev - Re: [PATCH net-next] liquidio: fix bug in soft reset failure detection

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Date:   Sun, 25 Jun 2017 09:11:37 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Felix Manlunas <felix.manlunas@...ium.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        raghu.vatsavayi@...ium.com, derek.chickles@...ium.com,
        satananda.burla@...ium.com
Subject: Re: [PATCH net-next] liquidio: fix bug in soft reset failure
 detection

On Sat, Jun 24, 2017 at 04:00:21AM -0700, Felix Manlunas wrote:
> From: Derek Chickles <derek.chickles@...ium.com>
>
> The code that detects a failed soft reset of Octeon is comparing the wrong
> value against the reset value of the Octeon SLI_SCRATCH_1 register,
> resulting in an inability to detect a soft reset failure.  Fix it by using
> the correct value in the comparison.
>
> Signed-off-by: Derek Chickles <derek.chickles@...ium.com>
> Signed-off-by: Satanand Burla <satananda.burla@...ium.com>
> Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
> ---
>  drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c | 2 +-
>  drivers/net/ethernet/cavium/liquidio/cn66xx_device.c    | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c b/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
> index 6081c31..3ab311f 100644
> --- a/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
> +++ b/drivers/net/ethernet/cavium/liquidio/cn23xx_pf_device.c
> @@ -221,7 +221,7 @@ static int cn23xx_pf_soft_reset(struct octeon_device *oct)
>  	/* Wait for 100ms as Octeon resets. */
>  	mdelay(100);
>
> -	if (octeon_read_csr64(oct, CN23XX_SLI_SCRATCH1) == 0x1234ULL) {
> +	if (octeon_read_csr64(oct, CN23XX_SLI_SCRATCH1) != 0x0ULL) {

Zero is always zero, please drop this 0x0ULL and add fixes line to the commit message.

>  		dev_err(&oct->pci_dev->dev, "OCTEON[%d]: Soft reset failed\n",
>  			oct->octeon_id);
>  		return 1;
> diff --git a/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c b/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
> index b28253c..effd7ac 100644
> --- a/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
> +++ b/drivers/net/ethernet/cavium/liquidio/cn66xx_device.c
> @@ -44,7 +44,7 @@ int lio_cn6xxx_soft_reset(struct octeon_device *oct)
>  	/* Wait for 10ms as Octeon resets. */
>  	mdelay(100);
>
> -	if (octeon_read_csr64(oct, CN6XXX_SLI_SCRATCH1) == 0x1234ULL) {
> +	if (octeon_read_csr64(oct, CN6XXX_SLI_SCRATCH1) != 0x0ULL) {
>  		dev_err(&oct->pci_dev->dev, "Soft reset failed\n");
>  		return 1;
>  	}

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