From 59ee97c0c1a8d0dadc092897ca7d5fe3a80e1bc3 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Mon, 6 Mar 2023 22:24:49 +0100 Subject: [PATCH] r8169: enable cfg9346 config register access in atomic context MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit For disabling ASPM during NAPI poll we'll have to unlock access to the config registers in atomic context. Other code parts running with config register access unlocked are partially longer and can sleep. Add a usage counter to enable parallel execution of code parts requiring unlocked config registers. Reviewed-by: Simon Horman Tested-by: Kai-Heng Feng Tested-by: Holger Hoffstätte Signed-off-by: Heiner Kallweit Signed-off-by: David S. Miller --- drivers/net/ethernet/realtek/r8169_main.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c index e6f3f19..61cbf49 100644 --- a/drivers/net/ethernet/realtek/r8169_main.c +++ b/drivers/net/ethernet/realtek/r8169_main.c @@ -616,6 +616,9 @@ struct rtl8169_private { spinlock_t config25_lock; spinlock_t mac_ocp_lock; + spinlock_t cfg9346_usage_lock; + int cfg9346_usage_count; + unsigned supports_gmii:1; unsigned aspm_manageable:1; dma_addr_t counters_phys_addr; @@ -664,12 +667,22 @@ static inline struct device *tp_to_dev(struct rtl8169_private *tp) static void rtl_lock_config_regs(struct rtl8169_private *tp) { - RTL_W8(tp, Cfg9346, Cfg9346_Lock); + unsigned long flags; + + spin_lock_irqsave(&tp->cfg9346_usage_lock, flags); + if (!--tp->cfg9346_usage_count) + RTL_W8(tp, Cfg9346, Cfg9346_Lock); + spin_unlock_irqrestore(&tp->cfg9346_usage_lock, flags); } static void rtl_unlock_config_regs(struct rtl8169_private *tp) { - RTL_W8(tp, Cfg9346, Cfg9346_Unlock); + unsigned long flags; + + spin_lock_irqsave(&tp->cfg9346_usage_lock, flags); + if (!tp->cfg9346_usage_count++) + RTL_W8(tp, Cfg9346, Cfg9346_Unlock); + spin_unlock_irqrestore(&tp->cfg9346_usage_lock, flags); } static void rtl_pci_commit(struct rtl8169_private *tp) @@ -5229,6 +5242,7 @@ 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->cfg9346_usage_lock); spin_lock_init(&tp->config25_lock); spin_lock_init(&tp->mac_ocp_lock); -- 2.7.4