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PCI: aardvark: Indicate error in 'val' when config read fails 

Most callers of config read do not check for return value. But most of the
ones that do, checks for error indication in 'val' variable.

This patch updates error handling in advk_pcie_rd_conf() function. If PIO
transfer fails then 'val' variable is set to 0xffffffff which indicates
failture.

Link: https://lore.kernel.org/r/20200528162604.GA323482@bjorn-Precision-5520
Link: https://lore.kernel.org/r/20200601130315.18895-1-pali@kernel.org
Reported-by: Bjorn Helgaas <helgaas@kernel.org>
Signed-off-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
This commit is contained in:
Pali Rohár 2020-06-01 15:03:15 +02:00 committed by Lorenzo Pieralisi
parent b3a9e3b962
commit b1bd571447
1 changed files with 3 additions and 1 deletions
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4
drivers/pci/controller/pci-aardvark.c
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@ -688,8 +688,10 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
advk_writel(pcie, 1, PIO_START);
ret = advk_pcie_wait_pio(pcie);
if (ret < 0)
if (ret < 0) {
*val = 0xffffffff;
return PCIBIOS_SET_FAILED;
}
advk_pcie_check_pio_status(pcie);