[09/43] iwlwifi: pcie: refcounting is not necessary anymore

Commit Message

Emmanuel Grumbach March 30, 2016, 2:04 p.m. UTC

From: Luca Coelho <[e-mail]>

We don't use the refcount value anymore, all the refcounting is done
in the runtime PM usage_count value.  Remove it.

Signed-off-by: Luca Coelho <[e-mail]>
Signed-off-by: Emmanuel Grumbach <[e-mail]>
---
 drivers/net/wireless/intel/iwlwifi/pcie/drv.c      |  4 +---
 drivers/net/wireless/intel/iwlwifi/pcie/internal.h |  4 ----
 drivers/net/wireless/intel/iwlwifi/pcie/trans.c    | 25 ++++++++--------------
 3 files changed, 10 insertions(+), 23 deletions(-)

Patch

diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index 05b9685..3456669 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -651,10 +651,8 @@  static int iwl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	/* The PCI device starts with a reference taken and we are
 	 * supposed to release it here.  But to simplify the
 	 * interaction with the opmode, we don't do it now, but let
-	 * the opmode release it when it's ready.  To account for this
-	 * reference, we start with ref_count set to 1.
+	 * the opmode release it when it's ready.
 	 */
-	trans_pcie->ref_count = 1;
 
 	return 0;
 
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
index 34bf7ce..9ce4ec6 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/internal.h
@@ -403,10 +403,6 @@  struct iwl_trans_pcie {
 	bool cmd_hold_nic_awake;
 	bool ref_cmd_in_flight;
 
-	/* protect ref counter */
-	spinlock_t ref_lock;
-	u32 ref_count;
-
 	dma_addr_t fw_mon_phys;
 	struct page *fw_mon_page;
 	u32 fw_mon_size;
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
index d4306e2..007bcb5 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c
@@ -2015,38 +2015,32 @@  static void iwl_trans_pcie_set_bits_mask(struct iwl_trans *trans, u32 reg,
 void iwl_trans_pcie_ref(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-	unsigned long flags;
 
 	if (iwlwifi_mod_params.d0i3_disable)
 		return;
 
-	spin_lock_irqsave(&trans_pcie->ref_lock, flags);
-	IWL_DEBUG_RPM(trans, "ref_counter: %d\n", trans_pcie->ref_count);
-	trans_pcie->ref_count++;
 	pm_runtime_get(&trans_pcie->pci_dev->dev);
-	spin_unlock_irqrestore(&trans_pcie->ref_lock, flags);
+
+#ifdef CONFIG_PM
+	IWL_DEBUG_RPM(trans, "runtime usage count: %d\n",
+		      atomic_read(&trans_pcie->pci_dev->dev.power.usage_count));
+#endif /* CONFIG_PM */
 }
 
 void iwl_trans_pcie_unref(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
-	unsigned long flags;
 
 	if (iwlwifi_mod_params.d0i3_disable)
 		return;
 
-	spin_lock_irqsave(&trans_pcie->ref_lock, flags);
-	IWL_DEBUG_RPM(trans, "ref_counter: %d\n", trans_pcie->ref_count);
-	if (WARN_ON_ONCE(trans_pcie->ref_count == 0)) {
-		spin_unlock_irqrestore(&trans_pcie->ref_lock, flags);
-		return;
-	}
-	trans_pcie->ref_count--;
-
 	pm_runtime_mark_last_busy(&trans_pcie->pci_dev->dev);
 	pm_runtime_put_autosuspend(&trans_pcie->pci_dev->dev);
 
-	spin_unlock_irqrestore(&trans_pcie->ref_lock, flags);
+#ifdef CONFIG_PM
+	IWL_DEBUG_RPM(trans, "runtime usage count: %d\n",
+		      atomic_read(&trans_pcie->pci_dev->dev.power.usage_count));
+#endif /* CONFIG_PM */
 }
 
 static const char *get_csr_string(int cmd)
@@ -2794,7 +2788,6 @@  struct iwl_trans *iwl_trans_pcie_alloc(struct pci_dev *pdev,
 	trans_pcie->trans = trans;
 	spin_lock_init(&trans_pcie->irq_lock);
 	spin_lock_init(&trans_pcie->reg_lock);
-	spin_lock_init(&trans_pcie->ref_lock);
 	mutex_init(&trans_pcie->mutex);
 	init_waitqueue_head(&trans_pcie->ucode_write_waitq);
 	trans_pcie->tso_hdr_page = alloc_percpu(struct iwl_tso_hdr_page);