From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 B8A7D49F108 for ; Tue, 6 Oct 2026 15:31:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791300691; cv=none; b=ZG7nF37Z7oAINK0v56w0d3yq/acdXGy1gPPbshnbqhKcU9hvTnmQylAJCRGMih7NAgpZIV03yzPn09rCs03te63q5NL+W9yTsLZNKdH6F7akf7GsPbFqInBE+hSH/8AUvuljzAU2Sxpn3tFDRya3hthJ5Ql55gtg9E1mlP/Cfsw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791300691; c=relaxed/simple; bh=eAOh1IoFN6+4dp3Ik63OJwIhNiWj37Mg8xyTW5OoZe8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NQUOZ/Yl9KEQLinvVapRbgDqt9/hXlVs+CErHOdNmGjeK15JKifomfRjTgc2nP2qxYjl0gY8Amq9MUrktjFZrsXcRtN5OgdmwjLcTDM9c9UR7JIaVuCpKX7/DIoJx5a6zvcLr29wrbo5SCDW40nwcHt9ybN2uRg5tEPwD8ZcBX0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=L6RhXuYc; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="L6RhXuYc" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1791300688; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=gKCmPpuKg4Foc/IiRmeq22AiNjBgaFEIWUaosj61+Zc=; b=L6RhXuYcVa62zhUR2XzCS+WWQknm7NkMBX3fT8hx2H30piSLEYxS+vYyLNCK9yMLBuwJMb Oo3uBacO2j9s4Aylkvoq26UT8tVWhnAZ5FCkPvCq/DM8DUTf3CokL7yxMAyMgmH6KT1Ft9 NbWccmosO+WE7ceKT7d1mnfIwwn9Uyo= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-669-Zew6Rg4OM9GhNErQJbxDJA-1; Tue, 06 Oct 2026 11:31:25 -0400 X-MC-Unique: Zew6Rg4OM9GhNErQJbxDJA-1 X-Mimecast-MFC-AGG-ID: Zew6Rg4OM9GhNErQJbxDJA_1791300684 Received: from mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.93]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id DED821865FF1; Tue, 6 Oct 2026 15:31:23 +0000 (UTC) Received: from ivecera-thinkpadp16vgen1.tpbc.csb (headnet05.pony-001.prod.iad2.dc.redhat.com [10.2.32.117]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 45C701800592; Tue, 6 Oct 2026 15:31:21 +0000 (UTC) From: Ivan Vecera To: netdev@vger.kernel.org Cc: Min Li , Vadim Fedorenko , Arkadiusz Kubalewski , Jiri Pirko , Jakub Kicinski , Prathosh Satish , Paolo Abeni , linux-kernel@vger.kernel.org Subject: [PATCH net v3 1/4] dpll: zl3073x: reject output frequencies with too small divisor Date: Tue, 6 Oct 2026 17:31:13 +0200 Message-ID: <20261006153116.347497-2-ivecera@redhat.com> In-Reply-To: <20261006153116.347497-1-ivecera@redhat.com> References: <20261006153116.347497-1-ivecera@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 The output divider has to be at least 2. In N-pin divide mode the per-output divider must be 2 or more and the N-pin is divided once more (also by 2 or more), so the N-pin needs an effective divisor of at least 4. zl3073x_pin_check_freq() only checked that an output frequency divides the synth frequency, so it accepted frequencies that would require a smaller divisor. Reject them: require a divisor of at least 2 for normal outputs and the P-pin of N-divided outputs, and 4 for the N-pin. Also reject a zero frequency, which would otherwise divide by zero. Fixes: a99a9f0ebdaa ("dpll: zl3073x: Read DPLL types and pin properties from system firmware") Signed-off-by: Ivan Vecera --- drivers/dpll/zl3073x/prop.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/dpll/zl3073x/prop.c b/drivers/dpll/zl3073x/prop.c index ac9d41d0f978..a4bdc3878590 100644 --- a/drivers/dpll/zl3073x/prop.c +++ b/drivers/dpll/zl3073x/prop.c @@ -22,7 +22,8 @@ * The function checks the given frequency is valid for the device. For input * pins it checks that the frequency can be factorized using supported base * frequencies. For output pins it checks that the frequency divides connected - * synth frequency without remainder. + * synth frequency without remainder and that the resulting divisor is within + * the range supported by the hardware. * * Return: true if the frequency is valid, false if not. */ @@ -30,7 +31,7 @@ static bool zl3073x_pin_check_freq(struct zl3073x_dev *zldev, enum dpll_pin_direction dir, u8 id, u64 freq) { - if (freq > U32_MAX) + if (!freq || freq > U32_MAX) goto err_inv_freq; if (dir == DPLL_PIN_DIRECTION_INPUT) { @@ -41,18 +42,32 @@ zl3073x_pin_check_freq(struct zl3073x_dev *zldev, enum dpll_pin_direction dir, if (rc) goto err_inv_freq; } else { - u32 synth_freq; - u8 out, synth; + const struct zl3073x_out *out; + u32 synth_freq, div, min_div, rem; + u8 out_id, synth; /* Get output pin synthesizer */ - out = zl3073x_output_pin_out_get(id); - synth = zl3073x_dev_out_synth_get(zldev, out); + out_id = zl3073x_output_pin_out_get(id); + synth = zl3073x_dev_out_synth_get(zldev, out_id); /* Get synth frequency */ synth_freq = zl3073x_dev_synth_freq_get(zldev, synth); /* Check the frequency divides synth frequency */ - if (synth_freq % (u32)freq) + div = div_u64_rem(synth_freq, freq, &rem); + if (rem) + goto err_inv_freq; + + /* The output divisor has to be at least 2. For the N-pin of an + * N-divided output the effective divisor also includes the N + * divider (>= 2), so the minimum is 4. + */ + out = zl3073x_out_state_get(zldev, out_id); + if (zl3073x_out_is_ndiv(out) && zl3073x_is_n_pin(id)) + min_div = 4; + else + min_div = 2; + if (div < min_div) goto err_inv_freq; } -- 2.55.0