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441001F000FF; Thu, 10 Sep 2026 09:30:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789032632; bh=jayYXqGma6vMHe6SCZAyaJDURj3XtLml7LBm53wVlS0=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=ENW7Fq2omFFVROv71erfPeZgs8Wh7lE8p+rPSbDxQbX3tGgtjzibJKM54HPtPwIoR jKnqXGKWD0otqUNhEXrPkjgsUbgr/3h9SzlVkfaL79P3qieygYglkHgtOIBk5JpR3F LQxw+3/Ee+Jn6SO/MQgg4ruVAHirI4r7qIR1LJdiQ5dafJ5EvXI1LmKKEsIyWLxAVe Khck0HkOaDyzPGmUUAs3BSmzFQVaKXiy4F7GRq60IIUCMj6llLl9qXRSL8D9rgTMNL 2CJKR2QJWx1xHhFaAAu8hLSt8CtIHAZhAXjOZ68uord5zoup9VoB4FMSQ4NhesoqFc P2bI70aJ9CypA== From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 06/12] phy: phy-mtk-dp: Support set_lanes in configure and properly cleanup To: "AngeloGioacchino Del Regno" Cc: conor+dt@kernel.org, neil.armstrong@linaro.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, robh@kernel.org, vkoul@kernel.org, olteanv@gmail.com, linux-phy@lists.infradead.org In-Reply-To: <20260910092038.48291-7-angelogioacchino.delregno@collabora.com> References: <20260910092038.48291-1-angelogioacchino.delregno@collabora.com> <20260910092038.48291-7-angelogioacchino.delregno@collabora.com> Date: Thu, 10 Sep 2026 09:30:31 +0000 Message-Id: <20260910093032.441001F000FF@smtp.kernel.org> X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-phy" Errors-To: linux-phy-bounces+linux-phy=archiver.kernel.org@lists.infradead.org VGhhbmsgeW91IGZvciB5b3VyIGNvbnRyaWJ1dGlvbiEgU2FzaGlrbyBBSSByZXZpZXcgZm91bmQg MSBwb3RlbnRpYWwgaXNzdWUocykgdG8gY29uc2lkZXI6Ci0gW0hpZ2hdIG10a19kcF9waHlfZGlz YWJsZV9hbGxfbGFuZXMoKSBpZ25vcmVzIHRoZSByZXR1cm4gdmFsdWUgb2YgcmVnbWFwX3JlYWQo 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+0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789032632; bh=jayYXqGma6vMHe6SCZAyaJDURj3XtLml7LBm53wVlS0=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=ENW7Fq2omFFVROv71erfPeZgs8Wh7lE8p+rPSbDxQbX3tGgtjzibJKM54HPtPwIoR jKnqXGKWD0otqUNhEXrPkjgsUbgr/3h9SzlVkfaL79P3qieygYglkHgtOIBk5JpR3F LQxw+3/Ee+Jn6SO/MQgg4ruVAHirI4r7qIR1LJdiQ5dafJ5EvXI1LmKKEsIyWLxAVe Khck0HkOaDyzPGmUUAs3BSmzFQVaKXiy4F7GRq60IIUCMj6llLl9qXRSL8D9rgTMNL 2CJKR2QJWx1xHhFaAAu8hLSt8CtIHAZhAXjOZ68uord5zoup9VoB4FMSQ4NhesoqFc P2bI70aJ9CypA== From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 06/12] phy: phy-mtk-dp: Support set_lanes in configure and properly cleanup Reply-To: sashiko-reviews@lists.linux.dev To: "AngeloGioacchino Del Regno" Cc: conor+dt@kernel.org, neil.armstrong@linaro.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, robh@kernel.org, vkoul@kernel.org, olteanv@gmail.com, linux-phy@lists.infradead.org In-Reply-To: <20260910092038.48291-7-angelogioacchino.delregno@collabora.com> References: <20260910092038.48291-1-angelogioacchino.delregno@collabora.com> <20260910092038.48291-7-angelogioacchino.delregno@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Thu, 10 Sep 2026 09:30:31 +0000 Message-Id: <20260910093032.441001F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: - [High] mtk_dp_phy_disable_all_lanes() ignores the return value of regmap_= read() and unconditionally returns 0, leading to uninitialized memory use a= nd dead code. -- commit 96237b9548980d0963b925da5fbae9fec554beb6 Author: AngeloGioacchino Del Regno Subject: phy: phy-mtk-dp: Support set_lanes in configure and properly clean= up This commit adds support for configuring a specific number of lanes via the .configure() callback. It also introduces functionality to disable all lanes during power-off and reset to ensure proper hardware state cleanup. > diff --git a/drivers/phy/mediatek/phy-mtk-dp.c b/drivers/phy/mediatek/phy= -mtk-dp.c > index 4247506ceb996..276391d991aae 100644 > --- a/drivers/phy/mediatek/phy-mtk-dp.c > +++ b/drivers/phy/mediatek/phy-mtk-dp.c [ ... ] > @@ -254,12 +272,39 @@ static int mtk_dp_phy_power_on(struct phy *phy) > return 0; > } > =20 > +static int mtk_dp_phy_disable_all_lanes(struct mtk_dp_phy *dp_phy) > +{ > + const struct mtk_dp_phy_pdata *pdata =3D dp_phy->pdata; > + const u8 *regs =3D pdata->regs_dig_glb; > + int ret; > + u32 val; > + > + /* Get mask of currently enabled lane */ > + regmap_read(dp_phy->regmap, pdata->off_dig_glb + regs[DP_PHYD_TX_CTL_0]= , &val); [Severity: High] Does this code handle the possibility of regmap_read() failing? If regmap_read() returns an error (e.g., if the underlying bus or clock is = in an invalid state), it will not initialize val. In this scenario, the subseq= uent operations would use uninitialized stack memory, potentially leading to ran= dom lanes being disabled based on garbage data. > + val =3D FIELD_GET(PHYD_TX_LN_EN, val); > + if (val =3D=3D 0) > + return 0; > + > + /* Disable all lanes (needs to be done one by one, from last to first) = */ > + do { > + u32 lane_num =3D fls(val) - 1; > + val &=3D ~BIT(lane_num); > + > + regmap_clear_bits(dp_phy->regmap, > + pdata->off_dig_glb + regs[DP_PHYD_TX_CTL_0], > + FIELD_PREP(PHYD_TX_LN_EN, BIT(lane_num))); > + } while (val); > + > + return 0; [Severity: High] Should this function return the error state from the regmap operations? It declares a ret variable but never uses it, and unconditionally returns 0. > +} > + > static int mtk_dp_phy_power_off(struct phy *phy) > { > struct mtk_dp_phy *dp_phy =3D phy_get_drvdata(phy); > const struct mtk_dp_phy_pdata *pdata =3D dp_phy->pdata; > const u8 *regs_dig =3D pdata->regs_dig_glb; > const u8 *regs_ana =3D pdata->regs_ana_glb; > + int ret; > =20 > regmap_set_bits(dp_phy->regmap, > pdata->off_ana_glb + regs_ana[DP_PHYA_GLB_FORCE_CTRL_1], > @@ -269,6 +314,12 @@ static int mtk_dp_phy_power_off(struct phy *phy) > regmap_write(dp_phy->regmap, > pdata->off_dig_glb + regs_dig[DP_PHYD_AUX_RX_CTL], 0); > =20 > + ret =3D mtk_dp_phy_disable_all_lanes(dp_phy); > + if (ret) { > + dev_err(dp_phy->dev, "Could not disable lanes for poweroff!\n"); > + return ret; > + } [Severity: High] Since mtk_dp_phy_disable_all_lanes() unconditionally returns 0, this error handling block appears to be dead code, preventing the driver from properly detecting hardware state failures during cleanup. --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260910092038.4829= 1-1-angelogioacchino.delregno@collabora.com?part=3D6