[PATCH v8 5/6] r8169: Use mutex to guard config register locking
From: Kai-Heng Feng <hidden>
Date: 2023-02-21 02:34:29
Also in:
lkml
Subsystem:
8169 10/100/1000 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Heiner Kallweit, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Right now r8169 doesn't have parallel access to its config register, but the next patch makes the driver access config register at anytime. So add a mutex to protect the config register from any potential race. Signed-off-by: Kai-Heng Feng <redacted> --- v8: - Swap the place when using the mutex. Protect when config register is unlocked. v7: - This is a new patch. drivers/net/ethernet/realtek/r8169_main.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index e40498dd08d17..897f90b48bba6 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c@@ -613,6 +613,8 @@ struct rtl8169_private { struct work_struct work; } wk; + struct mutex config_lock; + unsigned supports_gmii:1; unsigned aspm_manageable:1; dma_addr_t counters_phys_addr;
@@ -662,10 +664,12 @@ 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); + mutex_unlock(&tp->config_lock); } static void rtl_unlock_config_regs(struct rtl8169_private *tp) { + mutex_lock(&tp->config_lock); RTL_W8(tp, Cfg9346, Cfg9346_Unlock); }
@@ -5217,6 +5221,8 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent) return rc; } + mutex_init(&tp->config_lock); + tp->mmio_addr = pcim_iomap_table(pdev)[region]; xid = (RTL_R32(tp, TxConfig) >> 20) & 0xfcf;
--
2.34.1