[PATCH v2 1/3] powerpc/pseries: Device tree should only be updated once after suspend/migrate

[Nathan Fontenot]

On 01/22/2014 01:58 PM, Tyrel Datwyler wrote:
> From: Haren Myneni <hbabu at us.ibm.com>
> 
> From: Haren Myneni <hbabu at us.ibm.com>
> 
> The current code makes rtas calls for update-nodes, activate-firmware and then
> update-nodes again. The FW provides the same data for both update-nodes calls.
> As a result a proc entry exists error is reported for the second update while
> adding device nodes.
> 
> This patch makes a single rtas call for update-nodes after activating the FW.
> It also add rtas_busy delay for the activate-firmware rtas call.
> 
> Signed-off-by: Haren Myneni <hbabu at us.ibm.com>
> Signed-off-by: Tyrel Datwyler <tyreld at linux.vnet.ibm.com>

Acked-by: Nathan fontenot <nfont at linux.vnet.ibm.com>

> ---
>  arch/powerpc/platforms/pseries/mobility.c | 26 ++++++++++----------------
>  1 file changed, 10 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/mobility.c b/arch/powerpc/platforms/pseries/mobility.c
> index cde4e0a..bde7eba 100644
> --- a/arch/powerpc/platforms/pseries/mobility.c
> +++ b/arch/powerpc/platforms/pseries/mobility.c
> @@ -290,13 +290,6 @@ void post_mobility_fixup(void)
>  	int rc;
>  	int activate_fw_token;
> 
> -	rc = pseries_devicetree_update(MIGRATION_SCOPE);
> -	if (rc) {
> -		printk(KERN_ERR "Initial post-mobility device tree update "
> -		       "failed: %d\n", rc);
> -		return;
> -	}
> -
>  	activate_fw_token = rtas_token("ibm,activate-firmware");
>  	if (activate_fw_token == RTAS_UNKNOWN_SERVICE) {
>  		printk(KERN_ERR "Could not make post-mobility "
> @@ -304,16 +297,17 @@ void post_mobility_fixup(void)
>  		return;
>  	}
> 
> -	rc = rtas_call(activate_fw_token, 0, 1, NULL);
> -	if (!rc) {
> -		rc = pseries_devicetree_update(MIGRATION_SCOPE);
> -		if (rc)
> -			printk(KERN_ERR "Secondary post-mobility device tree "
> -			       "update failed: %d\n", rc);
> -	} else {
> +	do {
> +		rc = rtas_call(activate_fw_token, 0, 1, NULL);
> +	} while (rtas_busy_delay(rc));
> +
> +	if (rc)
>  		printk(KERN_ERR "Post-mobility activate-fw failed: %d\n", rc);
> -		return;
> -	}
> +
> +	rc = pseries_devicetree_update(MIGRATION_SCOPE);
> +	if (rc)
> +		printk(KERN_ERR "Post-mobility device tree update "
> +			"failed: %d\n", rc);
> 
>  	return;
>  }
>