Coverity: rcar_pcie_resume(): Error handling issues

Coverity: rcar_pcie_resume(): Error handling issues

[coverity-bot]

Hello!

This is an experimental semi-automated report about issues detected by
Coverity from a scan of next-20210408 as part of the linux-next scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan

You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by commits:

  Thu Apr 1 12:16:18 2021 +0100
    516286287d71 ("PCI: rcar: Convert to MSI domains")

Coverity reported the following:

*** CID 1503693:  Error handling issues  (CHECKED_RETURN)
/drivers/pci/controller/pcie-rcar-host.c: 992 in rcar_pcie_resume()
986
987     	/* Enable MSI */
988     	if (IS_ENABLED(CONFIG_PCI_MSI)) {
989     		struct resource res;
990     		u32 val;
991
vvv     CID 1503693:  Error handling issues  (CHECKED_RETURN)
vvv     Calling "of_address_to_resource" without checking return value (as is done elsewhere 98 out of 104 times).
992     		of_address_to_resource(dev->of_node, 0, &res);
993     		rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
994     		rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
995
996     		bitmap_to_arr32(&val, host->msi.used, INT_PCI_MSI_NR);
997     		rcar_pci_write_reg(pcie, val, PCIEMSIIER);

If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1503693 ("Error handling issues")
Fixes: 516286287d71 ("PCI: rcar: Convert to MSI domains")

Thanks for your attention!

-- 
Coverity-bot