linux-kernel - Re: [PATCH] scsi: hisi_sas: support deferred probe for v2 hw

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Message-ID: <4acc0b8d-f8d3-4649-87aa-4059105ebf2b@linaro.org>
Date:   Wed, 7 Dec 2016 13:57:32 +0800
From:   zhangfei <zhangfei.gao@...aro.org>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     john.garry2@...l.dcu.ie, linuxarm@...wei.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: hisi_sas: support deferred probe for v2 hw



On 2016年12月06日 20:44, John Garry wrote:
> In the hip06 and hip07 SoCs, the interrupt lines from the
> SAS controllers are connected to mbigen hw module [1].
> The mbigen module is probed with module_init, and, as such,
> is not guaranteed to probe before the SAS driver. So we need
> to support deferred probe.
>
> We check for probe deferral in the hw layer probe, so we not
> probe into the main layer and allocate shost, memories, etc.,
> to later learn that we need to defer the probe.
>
> [1] ./Documentation/devicetree/bindings/interrupt-controller/hisilicon,mbigen-v2.txt
>
> Signed-off-by: John Garry <john.garry@...wei.com>
Reviewed-by: Zhangfei Gao <zhangfei.gao@...aro.org>

Thanks