From mboxrd@z Thu Jan 1 00:00:00 1970 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 039D5183CB8; Tue, 8 Oct 2024 12:47:32 +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=1728391653; cv=none; b=cnvWUPI9EDxRneQwzROQk9qpTWxkrJZSt/aV5gOIi8xiTBYBptHUh90AXCfC9XFdgCGyKozseufjiZWej3lbZk/FLgjAJ14U0wOB6IdIsmeab8OSOtfLHaXovwSGNHUssjI3SSi3vIANAsRXqOl1KhCDDnedOjGdG1TthadFKcQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728391653; c=relaxed/simple; bh=mQbgBMbYAWFIVABc6JkLAIBqopHHEcRBiFSIhplp+5w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=olxVz0sg0wxxOwwZpwuAehb6iQc97bAfU4WvI9CWBuKCuKqPgA9sJEolT7OPG7n14k2AcnJXy+TMM1wKcDpRFzfnUI03q93farQ9itTxO+s2jtQaoeR3e/AXk+QmjeI3qq6XgkdlvzgD8FiSGpU2WTlmj6edBfk7aiYCPy9SH1I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lzp20hQz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="lzp20hQz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 60155C4CEC7; Tue, 8 Oct 2024 12:47:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728391652; bh=mQbgBMbYAWFIVABc6JkLAIBqopHHEcRBiFSIhplp+5w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lzp20hQzSNob8sfvu9LNrCAN96x2Ge/InAbHstqfhtAclOwxl2LbxyJjtf4l0Dt0L P/uu0cKPuhjSIrzB+qgMns2Kg0+owQ4gbSkDCltFkLD0asyT33FzpJ5WDJN/11Te5h WRF1eNXlnbF4ByOIfrUNhX9x8eFvXX3legQFvZR4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Takashi Iwai , Sasha Levin Subject: [PATCH 6.11 183/558] ALSA: hdsp: Break infinite MIDI input flush loop Date: Tue, 8 Oct 2024 14:03:33 +0200 Message-ID: <20241008115709.554753519@linuxfoundation.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241008115702.214071228@linuxfoundation.org> References: <20241008115702.214071228@linuxfoundation.org> User-Agent: quilt/0.67 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 6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai [ Upstream commit c01f3815453e2d5f699ccd8c8c1f93a5b8669e59 ] The current MIDI input flush on HDSP and HDSPM drivers relies on the hardware reporting the right value. If the hardware doesn't give the proper value but returns -1, it may be stuck at an infinite loop. Add a counter and break if the loop is unexpectedly too long. Link: https://patch.msgid.link/20240808091513.31380-1-tiwai@suse.de Signed-off-by: Takashi Iwai Signed-off-by: Sasha Levin --- sound/pci/rme9652/hdsp.c | 6 ++++-- sound/pci/rme9652/hdspm.c | 6 ++++-- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c index e7d1b43471a29..713ca262a0e97 100644 --- a/sound/pci/rme9652/hdsp.c +++ b/sound/pci/rme9652/hdsp.c @@ -1298,8 +1298,10 @@ static int snd_hdsp_midi_output_possible (struct hdsp *hdsp, int id) static void snd_hdsp_flush_midi_input (struct hdsp *hdsp, int id) { - while (snd_hdsp_midi_input_available (hdsp, id)) - snd_hdsp_midi_read_byte (hdsp, id); + int count = 256; + + while (snd_hdsp_midi_input_available(hdsp, id) && --count) + snd_hdsp_midi_read_byte(hdsp, id); } static int snd_hdsp_midi_output_write (struct hdsp_midi *hmidi) diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c index 267c7848974ae..74215f57f4fc9 100644 --- a/sound/pci/rme9652/hdspm.c +++ b/sound/pci/rme9652/hdspm.c @@ -1838,8 +1838,10 @@ static inline int snd_hdspm_midi_output_possible (struct hdspm *hdspm, int id) static void snd_hdspm_flush_midi_input(struct hdspm *hdspm, int id) { - while (snd_hdspm_midi_input_available (hdspm, id)) - snd_hdspm_midi_read_byte (hdspm, id); + int count = 256; + + while (snd_hdspm_midi_input_available(hdspm, id) && --count) + snd_hdspm_midi_read_byte(hdspm, id); } static int snd_hdspm_midi_output_write (struct hdspm_midi *hmidi) -- 2.43.0