On 20.06.2018 13:53, Krzysztof Kozlowski wrote: > On 20 June 2018 at 13:38, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote: >> Hi Krzysztof, >> >> On 20.06.2018 12:40, Krzysztof Kozlowski wrote: >>> On 15 June 2018 at 14:26, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote: >>>> Platform devices instantiated from device-tree always have pdev->id set to >>>> -1, so use of_get_alias_id() helper to retrieve proper device id. >>>> >>>> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> >>>> --- >>>> drivers/gpu/drm/exynos/exynos_drm_gsc.c | 9 +++++++-- >>>> 1 file changed, 7 insertions(+), 2 deletions(-) >>>> >>>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gsc.c b/drivers/gpu/drm/exynos/exynos_drm_gsc.c >>>> index e99dd1e4ba65..a63287597985 100644 >>>> --- a/drivers/gpu/drm/exynos/exynos_drm_gsc.c >>>> +++ b/drivers/gpu/drm/exynos/exynos_drm_gsc.c >>>> @@ -1196,7 +1196,12 @@ static int gsc_probe(struct platform_device *pdev) >>>> struct exynos_drm_ipp_formats *formats; >>>> struct gsc_context *ctx; >>>> struct resource *res; >>>> - int ret, i; >>>> + int ret, i, id; >>>> + >>>> + ret = of_alias_get_id(pdev->dev.of_node, "gsc"); >>>> + if (ret < 0) >>>> + return ret; >>>> + id = ret; >>>> >>>> ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); >>>> if (!ctx) >>>> @@ -1254,7 +1259,7 @@ static int gsc_probe(struct platform_device *pdev) >>>> } >>>> >>>> /* context initailization */ >>>> - ctx->id = pdev->id; >>>> + ctx->id = id; >>> Why do you need ctx->id at all? I see it is used only in dev_dbg and >>> dev_err messages but these should be easily identifiable by device >>> name+address. Maybe get rid of ctx->id entirely? >> I am working on patches adding framebuffer display pre-processing >> on-the-fly, they requires gscaler id to program sysreg registers. I hope >> to post it in near future. > OK, makes sense. Then I have a dependent comment - if alias id is used > by driver then probably it should be validated to prevent errors like > out-of-bounds access. DTB theoretically might come from out-of-tree or > from older version. Something like this was reported for our pinctrl > driver: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=93b0beae721b3344923b4b8317e9d83b542f4ca6 > Probably the validation should come with your code, Andrzej. Not here. OK, I will add it in my patchset. Regards Andrzej > > Best regards, > Krzysztof > > > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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