linux-kernel - [PATCH 11/17] Bluetooth: hci_bcm4377: Use pcie_lnkctl_clear_and

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Message-Id: <20230511131441.45704-12-ilpo.jarvinen@linux.intel.com>
Date:   Thu, 11 May 2023 16:14:35 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Lukas Wunner <lukas@...ner.de>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 11/17] Bluetooth: hci_bcm4377: Use pcie_lnkctl_clear_and_set() for changing LNKCTL

Don't assume that only the driver would be accessing LNKCTL. ASPM
policy changes can trigger write to LNKCTL outside of driver's control.

Use pcie_lnkctl_clear_and_set() which does proper locking to avoid
losing concurrent updates to the register value.

Suggested-by: Lukas Wunner <lukas@...ner.de>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/bluetooth/hci_bcm4377.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/bluetooth/hci_bcm4377.c b/drivers/bluetooth/hci_bcm4377.c
index 19ad0e788646..e2b489f678d9 100644
--- a/drivers/bluetooth/hci_bcm4377.c
+++ b/drivers/bluetooth/hci_bcm4377.c
@@ -2232,8 +2232,7 @@ static void bcm4377_disable_aspm(struct bcm4377_data *bcm4377)
 	 * or if the BIOS hasn't handed over control to us. We must *always*
 	 * disable ASPM for this device due to hardware errata though.
 	 */
-	pcie_capability_clear_word(bcm4377->pdev, PCI_EXP_LNKCTL,
-				   PCI_EXP_LNKCTL_ASPMC);
+	pcie_lnkctl_clear_and_set(bcm4377->pdev, PCI_EXP_LNKCTL_ASPMC, 0);
 }
 
 static void bcm4377_pci_free_irq_vectors(void *data)
-- 
2.30.2