From nobody Thu Sep 24 14:25:11 2026 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 804AF57266A; Wed, 23 Sep 2026 20:13:24 +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=1790194430; cv=none; b=MrJ7YtE0TnOpB28p2qdYH3XPLWredNb23uMLjp7bz3sS+2fERlj3dG28fLu4csod4BTLYUFaP+VvijtxM2I5JcLY0j2C9llNgFgKpyNDkIcwuuH20j0ahvLVnYtd4SsNHjI5HEXcjLYE4tDNBOzwF9lxf+6bipQWzyyAkJYau4A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790194430; c=relaxed/simple; bh=mtpq7mgmr0G/o19t8NxFClbAQzt5B9ZA1JK9DteCGCw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Dl7vERSwvpKZlI6N3KpFTyxKTsbuYFTAsd1Uxb8+4c4kw/q86vfiPrRQPQfNAADb/Z51yxI17FIqGF7SZDbJ1TUmapg5W73DTzAIskWHkjWAhth0rnI/xKHwBX27O+aKHZUMQvs4btaCIU1GGe4zsWRJ7NHR3ddGufFiGiPVcVM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=mHXoB9+d; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="mHXoB9+d" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 092381F000FF; Wed, 23 Sep 2026 20:13:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790194401; bh=XT9Xi9VdFMLfLT2A3igC5xaODMPYyjfYVhRup4jeIlI=; h=From:To:Cc:Subject:Date; b=mHXoB9+dzHVyY1aMhuzo0Dwap1WG0MxPHjPEuxIW04MuYhHvg7UIxcm7b+gQEWshg mCHeYzjJznx66IghgGlEcSLCkH5HJDQ6rVOqhmMTd7lSBWLoIee2wrhCfDl3im81c8 2TwjeBuSTKkpnsJPYDYQp4LWAhzLnaUe452zoomfYJbbAOxIFxTkxi8v3gSbcn/LkL 7bb7hYJMNbpNZ+8mye+XmnpMrLfkasHxtYsW98+NFXLi8Chx62ZXRVLsRHi3h5RYEo DY5LKqAzLIfPhM6yvnzFrtH9YWlaGtJTCQcUg3scR6vLFgCQiRp8K721cKI+XApyGG hGGiDotNfwtoA== From: Thorsten Blum To: Olivia Mackall , Herbert Xu , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig=20=28The=20Capable=20Hub=29?= , Kees Cook , Corentin LABBE Cc: Thorsten Blum , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] hwrng: amd - report partial reads in non-blocking mode Date: Wed, 23 Sep 2026 22:12:58 +0200 Message-ID: <20260923201259.90336-2-blum@kernel.org> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=866; i=blum@kernel.org; h=from:subject; bh=mtpq7mgmr0G/o19t8NxFClbAQzt5B9ZA1JK9DteCGCw=; b=owGbwMvMwCUWt7pQ4caZUj3G02pJDFlbjE4HeFscXxPm47tlcWr4RvmW8mn+Jw56p8X/v2G69 6v+FK/1HaUsDGJcDLJiiiwPZv2Y4VtaU7nJJGInzBxWJpAhDFycAjCRDToM/5T+slv8aJvOv+S/ kdsvf66Pn5c23F1or86t/5vptItz1TSGvxLNfYrNN/INOjecNc3c6Za+NG/G3dtMvkvWPHRneTc ngBcA X-Developer-Key: i=blum@kernel.org; a=openpgp; fpr=1D60735E8AEF3BE473B69D84733678FD8DFEEAD4 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" amd_rng_read() returns 0 if no more data is available, even if some data was already copied to the output buffer. Return the number of copied bytes instead. Fixes: 85962d2248fa ("hwrng: amd - Convert to new hwrng read() API") Cc: stable@vger.kernel.org Signed-off-by: Thorsten Blum --- drivers/char/hw_random/amd-rng.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-= rng.c index 42a18fd41050..9d53f4c3e5bd 100644 --- a/drivers/char/hw_random/amd-rng.c +++ b/drivers/char/hw_random/amd-rng.c @@ -80,7 +80,7 @@ static int amd_rng_read(struct hwrng *rng, void *buf, siz= e_t max, bool wait) if (timeout-- =3D=3D 0) return read; } else { - return 0; + return read; } } else { *data =3D ioread32(priv->iobase + RNGDATA);