[19/30] PCI: mobiveil: Use irq_data_get_irq_chip_data()

Message ID 20201210194044.473308721@linutronix.de
State Accepted
Commit b8fecfdfb08dcbabf3d46cfaf7c2fed0e6802ce8
Headers show
Series
  • [01/30] genirq: Move irq_has_action() into core code
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Commit Message

Thomas Gleixner Dec. 10, 2020, 7:25 p.m.
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: Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>
Cc: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
---
 drivers/pci/controller/mobiveil/pcie-mobiveil-host.c |    8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

Comments

Rob Herring Dec. 10, 2020, 10:56 p.m. | #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: Karthikeyan Mitran <m.karthikeyan@mobiveil.co.in>
> Cc: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Rob Herring <robh@kernel.org>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: linux-pci@vger.kernel.org
> ---
>  drivers/pci/controller/mobiveil/pcie-mobiveil-host.c |    8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)

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

Patch

--- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
@@ -306,13 +306,11 @@  int mobiveil_host_init(struct mobiveil_p
 
 static void mobiveil_mask_intx_irq(struct irq_data *data)
 {
-	struct irq_desc *desc = irq_to_desc(data->irq);
-	struct mobiveil_pcie *pcie;
+	struct mobiveil_pcie *pcie = irq_data_get_irq_chip_data(data);
 	struct mobiveil_root_port *rp;
 	unsigned long flags;
 	u32 mask, shifted_val;
 
-	pcie = irq_desc_get_chip_data(desc);
 	rp = &pcie->rp;
 	mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
 	raw_spin_lock_irqsave(&rp->intx_mask_lock, flags);
@@ -324,13 +322,11 @@  static void mobiveil_mask_intx_irq(struc
 
 static void mobiveil_unmask_intx_irq(struct irq_data *data)
 {
-	struct irq_desc *desc = irq_to_desc(data->irq);
-	struct mobiveil_pcie *pcie;
+	struct mobiveil_pcie *pcie = irq_data_get_irq_chip_data(data);
 	struct mobiveil_root_port *rp;
 	unsigned long flags;
 	u32 shifted_val, mask;
 
-	pcie = irq_desc_get_chip_data(desc);
 	rp = &pcie->rp;
 	mask = 1 << ((data->hwirq + PAB_INTX_START) - 1);
 	raw_spin_lock_irqsave(&rp->intx_mask_lock, flags);