From: John Garry Date: Tue, 6 Dec 2016 12:44:07 +0000 (+0800) Subject: scsi: hisi_sas: support deferred probe for v2 hw X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=26f3ba9600e5d4437bb7299d2b01003b0d93e853;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git scsi: hisi_sas: support deferred probe for v2 hw 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 Reviewed-by: Zhangfei Gao Signed-off-by: Martin K. Petersen --- diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c index 93876c0137eb..b934aec1eebb 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c +++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c @@ -2790,6 +2790,18 @@ static const struct hisi_sas_hw hisi_sas_v2_hw = { static int hisi_sas_v2_probe(struct platform_device *pdev) { + /* + * Check if we should defer the probe before we probe the + * upper layer, as it's hard to defer later on. + */ + int ret = platform_get_irq(pdev, 0); + + if (ret < 0) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "cannot obtain irq\n"); + return ret; + } + return hisi_sas_probe(pdev, &hisi_sas_v2_hw); }