From nobody Fri Oct 3 12:12:49 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 882442EC553 for ; Tue, 2 Sep 2025 08:34:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756802048; cv=none; b=D29ls8uKqbNZwWH6I2uX42sf9xr+cQo2Wl41ziFgGa5UCGoPEpejfGbb6HAlqyXD71v8cIiz/EBPAwTA4nlo1PLsUub/ijSfDHwWTNUkuFomaLDfGo1l5D4j3gSbl3CVHr5ZSmHcvBovCR9UkYeKY3UKtEjRgimqLM3rFjN7C1Y= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756802048; c=relaxed/simple; bh=CJPCj8VWwLfpomy9Zok5G16ISXjah6HfvSiZNbxLUwg=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=IBna6oF4iGh3U1zGAC3Ej5tXTT+cYjqemoZ4KsC5OhgpBs2rQUXDZcZS6ee8fTsphZfNr3axctm84zCSRc6/wYbG6lGW4+jN3Ymoq1FdNLHGhGyuJZqobpGjgKQWkGr9bVgsOMm9OYAJ8YPMRhjVNJkyk6qmF6HPfS7NoU8Zcxs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ZR+P5tMY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ZR+P5tMY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18CFDC4CEED; Tue, 2 Sep 2025 08:34:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1756802048; bh=CJPCj8VWwLfpomy9Zok5G16ISXjah6HfvSiZNbxLUwg=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ZR+P5tMY49rlPeoRiqsLU64936WnRpKITzZdZVJL8FcfjK5Nu6cykFbn/PbAHNm/Z +cuIk4djsGxLuYOZnO4qujCTC149UOgHCTXfeFZtSX9x+HtCHuMyG8crUTNQV0L+0c shjPKFai7snEiizUOWGjCSR2+D3WjTKDCe4mR6gXbWbX8liL9t4wc4gPE8XielDaz4 QLWEKDsFl6HuPbeNZf+dNrSYNTxReVPpR6T75+CvUF230b7ayDT89TehVcieRB8frJ gt2uqO+TPekQhjjF7DeANlcp/9yJfv/qyolBgJbZzMQRacLNEgbu3JvL2M/QLg4LGa NofaaLQIo6gUw== From: Maxime Ripard Date: Tue, 02 Sep 2025 10:32:50 +0200 Subject: [PATCH 22/29] drm/tidss: crtc: Cleanup reset implementation Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250902-drm-state-readout-v1-22-14ad5315da3f@kernel.org> References: <20250902-drm-state-readout-v1-0-14ad5315da3f@kernel.org> In-Reply-To: <20250902-drm-state-readout-v1-0-14ad5315da3f@kernel.org> To: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Simona Vetter , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Jyri Sarha , Tomi Valkeinen Cc: Devarsh Thakkar , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Maxime Ripard X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1422; i=mripard@kernel.org; h=from:subject:message-id; bh=CJPCj8VWwLfpomy9Zok5G16ISXjah6HfvSiZNbxLUwg=; b=owGbwMvMwCmsHn9OcpHtvjLG02pJDBnbVu/bOmdNXX9s+sodna/7Pwh8OVp9JnNPat4542ZLZ VGB99tOd0xlYRDmZJAVU2R5IhN2enn74ioH+5U/YOawMoEMYeDiFICJHFjF2LDt+3u39Pk/Yous 7sj8t4w/xvX3aBtnzKOTIadYP6+PZvJwOlz52rzs1fwdfvfUuNNEJzE2XJA1UXLt+fR69sTTeVW SZhcNLbwEXu1e5neFf9nDE5Mn/nkd9lFx9wZ+y5tdBT6+hW9aAQ== X-Developer-Key: i=mripard@kernel.org; a=openpgp; fpr=BE5675C37E818C8B5764241C254BCFC56BF6CE8D The tidss_crtc_reset() function will (rightfully) destroy any pre-existing state. However, the tidss CRTC driver has its own CRTC state structure that subclasses drm_crtc_state, and yet will destroy the previous state by calling __drm_atomic_helper_crtc_destroy_state() and kfree() on its drm_crtc_state pointer. It works only because the drm_crtc_state is the first field in the structure, and thus its offset is 0. It's incredibly fragile however, so let's call our destroy implementation in such a case to deal with it properly. Signed-off-by: Maxime Ripard Reviewed-by: Thomas Zimmermann --- drivers/gpu/drm/tidss/tidss_crtc.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/gpu/drm/tidss/tidss_crtc.c b/drivers/gpu/drm/tidss/tid= ss_crtc.c index eb431a238b11d22349d61f0e17f05994f50d5f2f..8fcc6a2f94770ae825eeb2a3b09= 856a2bf2d6a1e 100644 --- a/drivers/gpu/drm/tidss/tidss_crtc.c +++ b/drivers/gpu/drm/tidss/tidss_crtc.c @@ -355,13 +355,11 @@ static void tidss_crtc_destroy_state(struct drm_crtc = *crtc, static void tidss_crtc_reset(struct drm_crtc *crtc) { struct tidss_crtc_state *tstate; =20 if (crtc->state) - __drm_atomic_helper_crtc_destroy_state(crtc->state); - - kfree(crtc->state); + tidss_crtc_destroy_state(crtc, crtc->state); =20 tstate =3D kzalloc(sizeof(*tstate), GFP_KERNEL); if (!tstate) { crtc->state =3D NULL; return; --=20 2.50.1