[PATCH v4 17/25] PCI: vmd: Use PCI_POSSIBLE_ERROR() to check read from hardware
From: Naveen Naidu <hidden>
Date: 2021-11-18 14:09:00
Also in:
linux-pci, lkml
Subsystem:
pci driver for intel volume management device (vmd), pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Nirmal Patel, Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
An MMIO read from a PCI device that doesn't exist or doesn't respond causes a PCI error. There's no real data to return to satisfy the CPU read, so most hardware fabricates ~0 data. Use PCI_POSSIBLE_ERROR() to check the response we get when we read data from hardware. This helps unify PCI error response checking and make error checks consistent and easier to find. Reviewed-by: Jonathan Derrick <jonathan.derrick@linux.dev> Signed-off-by: Naveen Naidu <redacted> --- drivers/pci/controller/vmd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
index a45e8e59d3d4..515d05605204 100644
--- a/drivers/pci/controller/vmd.c
+++ b/drivers/pci/controller/vmd.c@@ -541,7 +541,7 @@ static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint, int ret; ret = pci_read_config_dword(dev, PCI_REG_VMLOCK, &vmlock); - if (ret || vmlock == ~0) + if (ret || PCI_POSSIBLE_ERROR(vmlock)) return -ENODEV; if (MB2_SHADOW_EN(vmlock)) {
--
2.25.1
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