netdev - [PATCH netnext 10/16] net: aquantia: introduce fwreq mutex

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Message-ID: <fbc7c5e48e28283235a7b1a578daadf4e99dfda1.1555158087.git.igor.russkikh@aquantia.com>
Date:   Sat, 13 Apr 2019 12:32:05 +0000
From:   Igor Russkikh <Igor.Russkikh@...antia.com>
To:     "David S . Miller" <davem@...emloft.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Nikita Danilov <Nikita.Danilov@...antia.com>,
        Dmitry Bogdanov <Dmitry.Bogdanov@...antia.com>,
        Igor Russkikh <Igor.Russkikh@...antia.com>,
        Nikita Danilov <Nikita.Danilov@...antia.com>
Subject: [PATCH netnext 10/16] net: aquantia: introduce fwreq mutex

From: Nikita Danilov <ndanilov@...antia.com>

Some of FW operations could be invoked simultaneously,
from f.e. ethtool context and from service service activity work.
Here we introduce a fw mutex to secure and serialize access
to FW logic.

Signed-off-by: Nikita Danilov <ndanilov@...antia.com>
Signed-off-by: Igor Russkikh <igor.russkikh@...antia.com>
---
 drivers/net/ethernet/aquantia/atlantic/aq_nic.h      | 2 ++
 drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
index 1508d93889a7..329cf0746abe 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.h
@@ -105,6 +105,8 @@ struct aq_nic_s {
 	struct pci_dev *pdev;
 	unsigned int msix_entry_mask;
 	u32 irqvecs;
+	/* mutex to serialize FW interface access operations */
+	struct mutex fwreq_mutex;
 	struct aq_hw_rx_fltrs_s aq_hw_rx_fltrs;
 	struct work_struct link_update_task;
 };
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
index 961e9777e66b..a607e25dfbff 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
@@ -231,6 +231,8 @@ static int aq_pci_probe(struct pci_dev *pdev,
 	SET_NETDEV_DEV(ndev, &pdev->dev);
 	pci_set_drvdata(pdev, self);
 
+	mutex_init(&self->fwreq_mutex);
+
 	err = aq_pci_probe_get_hw_by_id(pdev, &self->aq_hw_ops,
 					&aq_nic_get_cfg(self)->aq_hw_caps);
 	if (err)
-- 
2.17.1