From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 369B23FA5F0; Wed, 30 Sep 2026 16:31:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790785871; cv=none; b=XoYKcsqhb3jralcJsUYGyLP3EMRm5tYS0Jh+bCW9R8d5H0bvLV1sZu9GL8ffOdH0ZArZxvUFogb7BlUYV/uDG0EbJk4jOjdAcSOoJ1HldfAYWhuFDI8ZiVZM201vmz2YvCdbGpY2WVZVL5saPgFQIVAf3DtJWmPPk9BitF6KLdw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790785871; c=relaxed/simple; bh=l28emElvU+9WTb62QG+/ElmriFXSWVmmZaGSXSn6dh8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HhMLKI+K10aQ0NCs5X6IrdrAzConlGpOMS6DQZSGNlWi11lik2Ceuc+CDSBmnW3f1xVMDXP9uVMXgkxc5h9/fjvioaDvv1JL5pbMrkVEUeDdv/Bl0W+5BbG7OtyQZoTo1PcFaTXlow87V/XVxhK/HxPhsruR+gO3aedqe8mbcwk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=uduIiVDf; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="uduIiVDf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 856421F000FF; Wed, 30 Sep 2026 16:31:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790785870; bh=gazKtYMOQmZtef2FUF8NwEOOX9lC6e77N1gg8ZNFOYs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=uduIiVDfCVYUSf2twR5dFDbwV5u7u0fo+/wOEsllBF6UuMWt+E7rPcTG5NQCp/wdB qMzfvaBFob9S+9tcC9qVLWFI7XvpAmw0y7v7O85h92bVdnai60Ich0sel8u11WnQB5 UOUnKHWJvZ/YeVHZBN1CKeIxfI5n4Kwaaf7eTVKE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thomas Zimmermann , Javier Martinez Canillas , Sasha Levin Subject: [PATCH 6.1 661/982] drm/ast: Remove little-endianism from I/O helpers Date: Wed, 30 Sep 2026 17:23:17 +0200 Message-ID: <20260930152430.962707775@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152416.775402466@linuxfoundation.org> References: <20260930152416.775402466@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Zimmermann [ Upstream commit a38410860628909712ea6a2becd42bab56c70e9a ] Replace one call to ast_io_write16() with two calls to ast_io_write8() in ast_set_index_reg(). The combined 16-bit-wide write of an index register and the corresponding data register only works on little- endian systems. Write both registers independent from each other. Signed-off-by: Thomas Zimmermann Reviewed-by: Javier Martinez Canillas Link: https://patchwork.freedesktop.org/patch/msgid/20230221155745.27484-2-tzimmermann@suse.de Stable-dep-of: 073a30d75f30 ("drm/vc4: Use managed KMS polling to fix UAF on unbind") Signed-off-by: Sasha Levin --- drivers/gpu/drm/ast/ast_drv.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h index 2e44b971c3a6b..22328693fcf33 100644 --- a/drivers/gpu/drm/ast/ast_drv.h +++ b/drivers/gpu/drm/ast/ast_drv.h @@ -281,7 +281,9 @@ static inline void ast_set_index_reg(struct ast_private *ast, uint32_t base, uint8_t index, uint8_t val) { - ast_io_write16(ast, base, ((u16)val << 8) | index); + ast_io_write8(ast, base, index); + ++base; + ast_io_write8(ast, base, val); } void ast_set_index_reg_mask(struct ast_private *ast, -- 2.53.0