diff mbox series

[18/30] PCI: xilinx-nwl: Use irq_data_get_irq_chip_data()

Message ID 20201210194044.364211860@linutronix.de (mailing list archive)
State New
Headers show
Series genirq: Treewide hunt for irq descriptor abuse and assorted fixes | expand

Commit Message

Thomas Gleixner Dec. 10, 2020, 7:25 p.m. UTC
Going through a full irq descriptor lookup instead of just using the proper
helper function which provides direct access is suboptimal.

In fact it _is_ wrong because the chip callback needs to get the chip data
which is relevant for the chip while using the irq descriptor variant
returns the irq chip data of the top level chip of a hierarchy. It does not
matter in this case because the chip is the top level chip, but that
doesn't make it more correct.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
---
 drivers/pci/controller/pcie-xilinx-nwl.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Comments

Rob Herring Dec. 10, 2020, 10:56 p.m. UTC | #1
On Thu, Dec 10, 2020 at 1:42 PM Thomas Gleixner <tglx@linutronix.de> wrote:
>
> Going through a full irq descriptor lookup instead of just using the proper
> helper function which provides direct access is suboptimal.
>
> In fact it _is_ wrong because the chip callback needs to get the chip data
> which is relevant for the chip while using the irq descriptor variant
> returns the irq chip data of the top level chip of a hierarchy. It does not
> matter in this case because the chip is the top level chip, but that
> doesn't make it more correct.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Michal Simek <michal.simek@xilinx.com>
> Cc: linux-pci@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> ---
>  drivers/pci/controller/pcie-xilinx-nwl.c |    8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)

Reviewed-by: Rob Herring <robh@kernel.org>
diff mbox series

Patch

--- a/drivers/pci/controller/pcie-xilinx-nwl.c
+++ b/drivers/pci/controller/pcie-xilinx-nwl.c
@@ -379,13 +379,11 @@  static void nwl_pcie_msi_handler_low(str
 
 static void nwl_mask_leg_irq(struct irq_data *data)
 {
-	struct irq_desc *desc = irq_to_desc(data->irq);
-	struct nwl_pcie *pcie;
+	struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
 	unsigned long flags;
 	u32 mask;
 	u32 val;
 
-	pcie = irq_desc_get_chip_data(desc);
 	mask = 1 << (data->hwirq - 1);
 	raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
 	val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);
@@ -395,13 +393,11 @@  static void nwl_mask_leg_irq(struct irq_
 
 static void nwl_unmask_leg_irq(struct irq_data *data)
 {
-	struct irq_desc *desc = irq_to_desc(data->irq);
-	struct nwl_pcie *pcie;
+	struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data);
 	unsigned long flags;
 	u32 mask;
 	u32 val;
 
-	pcie = irq_desc_get_chip_data(desc);
 	mask = 1 << (data->hwirq - 1);
 	raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags);
 	val = nwl_bridge_readl(pcie, MSGF_LEG_MASK);