linux-kernel - Re: [PATCH 2/2] clk: qcom: dispcc-sm6350: Add missing parent

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Message-ID: <6220744e-8e62-475f-a1a3-3b7c2c888b3b@oss.qualcomm.com>
Date: Fri, 20 Dec 2024 11:28:36 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: qcom: dispcc-sm6350: Add missing parent_map for
 a clock

On 20.12.2024 10:03 AM, Luca Weiss wrote:
> If a clk_rcg2 has a parent, it should also have parent_map defined,
> otherwise we'll get a NULL pointer dereference when calling clk_set_rate
> like the following:
> 
>   [    3.388105] Call trace:
>   [    3.390664]  qcom_find_src_index+0x3c/0x70 (P)
>   [    3.395301]  qcom_find_src_index+0x1c/0x70 (L)
>   [    3.399934]  _freq_tbl_determine_rate+0x48/0x100
>   [    3.404753]  clk_rcg2_determine_rate+0x1c/0x28
>   [    3.409387]  clk_core_determine_round_nolock+0x58/0xe4
>   [    3.421414]  clk_core_round_rate_nolock+0x48/0xfc
>   [    3.432974]  clk_core_round_rate_nolock+0xd0/0xfc
>   [    3.444483]  clk_core_set_rate_nolock+0x8c/0x300
>   [    3.455886]  clk_set_rate+0x38/0x14c
> 
> Add the parent_map property for the clock where it's missing and also
> un-inline the parent_data as well to keep the matching parent_map and
> parent_data together.
> 
> Fixes: 837519775f1d ("clk: qcom: Add display clock controller driver for SM6350")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

Konrad