diff mbox series

[net-next,3/6] r8169: enable cfg9346 config register access in atomic context

Message ID 15b30923-0b59-db1e-e64f-3b05b8fcbd01@gmail.com (mailing list archive)
State Accepted
Commit 59ee97c0c1a8d0dadc092897ca7d5fe3a80e1bc3
Delegated to: Netdev Maintainers
Headers show
Series r8169: disable ASPM during NAPI poll | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 20 this patch: 20
netdev/cc_maintainers success CCed 7 of 7 maintainers
netdev/build_clang success Errors and warnings before: 18 this patch: 18
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 20 this patch: 20
netdev/checkpatch warning CHECK: spinlock_t definition without comment
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Heiner Kallweit March 6, 2023, 9:24 p.m. UTC 
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 <simon.horman@corigine.com>
Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/net/ethernet/realtek/r8169_main.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index e6f3f1947..61cbf498f 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);