From patchwork Sun Jan 7 00:16:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Christian A. Ehrhardt" X-Patchwork-Id: 760750 Received: from cae.in-ulm.de (cae.in-ulm.de [217.10.14.231]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 0B96623B5; Sun, 7 Jan 2024 00:17:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=c--e.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=c--e.de Received: by cae.in-ulm.de (Postfix, from userid 1000) id B726414033C; Sun, 7 Jan 2024 01:17:48 +0100 (CET) From: "Christian A. Ehrhardt" To: Heikki Krogerus , linux-usb@vger.kernel.org Cc: "Christian A. Ehrhardt" , Dell.Client.Kernel@dell.com, Greg Kroah-Hartman , Neil Armstrong , Hans de Goede , Jack Pham , Fabrice Gasnier , =?utf-8?q?Samuel_=C4=8Cavoj?= , linux-kernel@vger.kernel.org Subject: [PATCH 1/4] usb: ucsi: Add missing ppm_lock Date: Sun, 7 Jan 2024 01:16:58 +0100 Message-Id: <20240107001701.130535-2-lk@c--e.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20240107001701.130535-1-lk@c--e.de> References: <20240107001701.130535-1-lk@c--e.de> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Calling ->sync_write must be done while holding the PPM lock as the mailbox logic does not support concurrent commands. Add a missing lock around the only call to ucsi_acknowledge_connector_change. Additionally, warn in ucsi_acpi.c if a command is started while the COMMAND_PENDING bit is already set. Signed-off-by: Christian A. Ehrhardt --- drivers/usb/typec/ucsi/ucsi.c | 2 ++ drivers/usb/typec/ucsi/ucsi_acpi.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c index 61b64558f96c..8f9dff993b3d 100644 --- a/drivers/usb/typec/ucsi/ucsi.c +++ b/drivers/usb/typec/ucsi/ucsi.c @@ -935,7 +935,9 @@ static void ucsi_handle_connector_change(struct work_struct *work) clear_bit(EVENT_PENDING, &con->ucsi->flags); + mutex_lock(&ucsi->ppm_lock); ret = ucsi_acknowledge_connector_change(ucsi); + mutex_unlock(&ucsi->ppm_lock); if (ret) dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret); diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c index 6bbf490ac401..8062d0a4b523 100644 --- a/drivers/usb/typec/ucsi/ucsi_acpi.c +++ b/drivers/usb/typec/ucsi/ucsi_acpi.c @@ -75,6 +75,8 @@ static int ucsi_acpi_sync_write(struct ucsi *ucsi, unsigned int offset, struct ucsi_acpi *ua = ucsi_get_drvdata(ucsi); int ret; + WARN_ON(test_bit(COMMAND_PENDING, &ua->flags)); + set_bit(COMMAND_PENDING, &ua->flags); ret = ucsi_acpi_async_write(ucsi, offset, val, val_len);