Messages in this thread Patch in this message | | | From | Kai-Heng Feng <> | Subject | [PATCH v8 5/6] r8169: Use mutex to guard config register locking | Date | Tue, 21 Feb 2023 10:32:36 +0800 |
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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 <kai.heng.feng@canonical.com> --- 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
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