Re: [PATCH v2 2/5] PCI: dwc: Check alloc_page() return value

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On 2020-09-24 12:06, Jisheng Zhang wrote:
We need to check alloc_page() succeed or not before continuing.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c
b/drivers/pci/controller/dwc/pcie-designware-host.c
index 0a19de946351..9e04e8ef3aa4 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -303,6 +303,11 @@ void dw_pcie_msi_init(struct pcie_port *pp)
 	u64 msi_target;

 	pp->msi_page = alloc_page(GFP_KERNEL);
+	if (!pp->msi_page) {
+		dev_err(dev, "Failed to alloc MSI page\n");

A failing allocation will already scream, so there is no need to
add insult to injury.

More importantly, what is this MSI page ever used for? If I remember
well, this is just a random address that never gets written to.

So why do we allocate a page here? Why do we bother with this DMA
mapping?

        M.
--
Who you jivin' with that Cosmik Debris?



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