Coverity: rcar_pcie_resume(): Error handling issues

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):

Addresses-Coverity-ID: 1503693 ("Error handling issues")

Thanks for your attention!

Coverity-bot