From: Alexander Shishkin Date: Fri, 3 May 2019 08:44:37 +0000 (+0300) Subject: intel_th: Skip subdevices if their MMIO is missing X-Git-Tag: v5.4-rc1~1074^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=23f667494b4d65d230cf61ad0d0b96c72f3a163c;p=platform%2Fkernel%2Flinux-rpi.git intel_th: Skip subdevices if their MMIO is missing If a subdevice requires an MMIO region that wasn't in the resources passed down from the glue layer, don't instantiate it, but don't error out. This means that that particular subdevice doesn't exist for this instance of Intel TH, which is a perfectly normal situation. This applies, for example, to the "rtit" source device. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index c577b94..8c221e1 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -607,6 +607,9 @@ intel_th_subdevice_alloc(struct intel_th *th, */ if (!res[r].end && res[r].flags == IORESOURCE_MEM) { bar = res[r].start; + err = -ENODEV; + if (bar >= th->num_resources) + goto fail_put_device; res[r].start = 0; res[r].end = resource_size(&devres[bar]) - 1; } @@ -749,8 +752,13 @@ static int intel_th_populate(struct intel_th *th) thdev = intel_th_subdevice_alloc(th, subdev); /* note: caller should free subdevices from th::thdev[] */ - if (IS_ERR(thdev)) + if (IS_ERR(thdev)) { + /* ENODEV for individual subdevices is allowed */ + if (PTR_ERR(thdev) == -ENODEV) + continue; + return PTR_ERR(thdev); + } th->thdev[th->num_thdevs++] = thdev; } @@ -813,9 +821,6 @@ intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata, struct intel_th *th; int err, r; - if (ndevres < TH_MMIO_END) - return ERR_PTR(-EINVAL); - th = kzalloc(sizeof(*th), GFP_KERNEL); if (!th) return ERR_PTR(-ENOMEM);