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Fri, 06 Dec 2024 01:43:23 -0800 (PST) Received: from umbar.lan ([192.130.178.90]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-30020db3805sm4128441fa.50.2024.12.06.01.43.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Dec 2024 01:43:23 -0800 (PST) From: Dmitry Baryshkov Date: Fri, 06 Dec 2024 11:43:08 +0200 Subject: [PATCH v2 05/10] drm/exynos: hdmi: use eld_mutex to protect access to connector->eld MIME-Version: 1.0 Message-Id: <20241206-drm-connector-eld-mutex-v2-5-c9bce1ee8bea@linaro.org> References: <20241206-drm-connector-eld-mutex-v2-0-c9bce1ee8bea@linaro.org> In-Reply-To: <20241206-drm-connector-eld-mutex-v2-0-c9bce1ee8bea@linaro.org> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Harry Wentland , Leo Li , Rodrigo Siqueira , Alex Deucher , =?utf-8?q?Christian_K=C3=B6nig?= , Xinhui Pan , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Phong LE , Inki Dae , Seung-Woo Kim , Kyungmin Park , Krzysztof Kozlowski , Alim Akhtar , Jani Nikula , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , Rob Clark , Abhinav Kumar , Sean Paul , Marijn Suijten , Alain Volmat , Raphael Gallais-Pou , Dave Stevenson , =?utf-8?q?Ma=C3=ADra_Cana?= =?utf-8?q?l?= , Raspberry Pi Kernel Maintenance Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, amd-gfx@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1061; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=I1wH9N5enlUiSVwdDRB0wmAdGhFse9ySIo7WNjanmNE=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBnUscuTpR0+HiR38S1fTr4ertYoyhKL7gh5Neki QVFnX1dWgWJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZ1LHLgAKCRCLPIo+Aiko 1cP5B/4t0Yy2pHo0bHZjNzf9FSu/qDR8IpkFFhM98PVBn8EV3bNlLhb3/FOwaAYFawC0R7RFsei 6gC0/YzWxhmMGYPjsOa/37GrWtmPrdHhBZ+KBT63EfOBOW+V3p8zsoWg67YBwUdMuuGRt0u0auc DgeeGk8WkE3xEW+/kPD2P0j0s/FWIYP6HpthpzIzXnTLkTKofLtovXgVO4JA7XKTloel9mAL6hd YV3thOkL+KoTiLV5O4nnCwLlrkMriaWauaCc/+rcxPaFF/ZnLJwVFuHb04GMj7WXisEfuKJ47PX zmzNh+qUndFSRAODqbBfgIEe9P0WLax3l98lRYUC73tWfPVy X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Reading access to connector->eld can happen at the same time the drm_edid_to_eld() updates the data. Take the newly added eld_mutex in order to protect connector->eld from concurrent access. Reviewed-by: Maxime Ripard Signed-off-by: Dmitry Baryshkov --- drivers/gpu/drm/exynos/exynos_hdmi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c index c9d4b9146df95bb46cb6bea4849c331616c2b463..6fc537c9048f5c8e57e30f083121c9aea6b99a5f 100644 --- a/drivers/gpu/drm/exynos/exynos_hdmi.c +++ b/drivers/gpu/drm/exynos/exynos_hdmi.c @@ -1648,7 +1648,9 @@ static int hdmi_audio_get_eld(struct device *dev, void *data, uint8_t *buf, struct hdmi_context *hdata = dev_get_drvdata(dev); struct drm_connector *connector = &hdata->connector; + mutex_lock(&connector->eld_mutex); memcpy(buf, connector->eld, min(sizeof(connector->eld), len)); + mutex_unlock(&connector->eld_mutex); return 0; }