This is a note to let you know that I've just added the patch titled
r8169: use spinlock to protect mac ocp register access
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
r8169-use-spinlock-to-protect-mac-ocp-register-acces.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit f161a3b464b4ff8bf2f390e15c65540029c519d8
Author: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Date: Mon Mar 6 22:23:15 2023 +0100
r8169: use spinlock to protect mac ocp register access
[ Upstream commit 91c8643578a21e435c412ffbe902bb4b4773e262 ]
For disabling ASPM during NAPI poll we'll have to access mac ocp
registers in atomic context. This could result in races because
a mac ocp read consists of a write to register OCPDR, followed
by a read from the same register. Therefore add a spinlock to
protect access to mac ocp registers.
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Tested-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Tested-by: Holger Hoffstätte <holger@xxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Stable-dep-of: 5e864d90b208 ("r8169: skip DASH fw status checks when DASH is disabled")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 3dbcb311dcbf2..c7dd0eb94817f 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -615,6 +615,8 @@ struct rtl8169_private {
struct work_struct work;
} wk;
+ spinlock_t mac_ocp_lock;
+
unsigned supports_gmii:1;
unsigned aspm_manageable:1;
unsigned dash_enabled:1;
@@ -850,7 +852,7 @@ static int r8168_phy_ocp_read(struct rtl8169_private *tp, u32 reg)
(RTL_R32(tp, GPHY_OCP) & 0xffff) : -ETIMEDOUT;
}
-static void r8168_mac_ocp_write(struct rtl8169_private *tp, u32 reg, u32 data)
+static void __r8168_mac_ocp_write(struct rtl8169_private *tp, u32 reg, u32 data)
{
if (rtl_ocp_reg_failure(reg))
return;
@@ -858,7 +860,16 @@ static void r8168_mac_ocp_write(struct rtl8169_private *tp, u32 reg, u32 data)
RTL_W32(tp, OCPDR, OCPAR_FLAG | (reg << 15) | data);
}
-static u16 r8168_mac_ocp_read(struct rtl8169_private *tp, u32 reg)
+static void r8168_mac_ocp_write(struct rtl8169_private *tp, u32 reg, u32 data)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&tp->mac_ocp_lock, flags);
+ __r8168_mac_ocp_write(tp, reg, data);
+ spin_unlock_irqrestore(&tp->mac_ocp_lock, flags);
+}
+
+static u16 __r8168_mac_ocp_read(struct rtl8169_private *tp, u32 reg)
{
if (rtl_ocp_reg_failure(reg))
return 0;
@@ -868,12 +879,28 @@ static u16 r8168_mac_ocp_read(struct rtl8169_private *tp, u32 reg)
return RTL_R32(tp, OCPDR);
}
+static u16 r8168_mac_ocp_read(struct rtl8169_private *tp, u32 reg)
+{
+ unsigned long flags;
+ u16 val;
+
+ spin_lock_irqsave(&tp->mac_ocp_lock, flags);
+ val = __r8168_mac_ocp_read(tp, reg);
+ spin_unlock_irqrestore(&tp->mac_ocp_lock, flags);
+
+ return val;
+}
+
static void r8168_mac_ocp_modify(struct rtl8169_private *tp, u32 reg, u16 mask,
u16 set)
{
- u16 data = r8168_mac_ocp_read(tp, reg);
+ unsigned long flags;
+ u16 data;
- r8168_mac_ocp_write(tp, reg, (data & ~mask) | set);
+ spin_lock_irqsave(&tp->mac_ocp_lock, flags);
+ data = __r8168_mac_ocp_read(tp, reg);
+ __r8168_mac_ocp_write(tp, reg, (data & ~mask) | set);
+ spin_unlock_irqrestore(&tp->mac_ocp_lock, flags);
}
/* Work around a hw issue with RTL8168g PHY, the quirk disables
@@ -5232,6 +5259,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
tp->eee_adv = -1;
tp->ocp_base = OCP_STD_PHY_BASE;
+ spin_lock_init(&tp->mac_ocp_lock);
+
dev->tstats = devm_netdev_alloc_pcpu_stats(&pdev->dev,
struct pcpu_sw_netstats);
if (!dev->tstats)
