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fpga: altera-cvp: fix 'bad IO access' on x86_64

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If mapping the CvP BAR fails, we still can configure the FPGA via
PCI config space access. In this case the iomap pointer is NULL.
On x86_64, passing NULL address to pci_iounmap() generates
"Bad IO access at port 0x0" output with stack call trace. Fix it.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anatolij Gustschin 2018-11-07 11:51:45 -06:00 committed by Greg Kroah-Hartman
parent 1e5106031f
commit 187fade88c
1 changed files with 4 additions and 2 deletions
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6
drivers/fpga/altera-cvp.c
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@ -477,7 +477,8 @@ static int altera_cvp_probe(struct pci_dev *pdev,
return 0;
err_unmap:
pci_iounmap(pdev, conf->map);
if (conf->map)
pci_iounmap(pdev, conf->map);
pci_release_region(pdev, CVP_BAR);
err_disable:
cmd &= ~PCI_COMMAND_MEMORY;
@ -493,7 +494,8 @@ static void altera_cvp_remove(struct pci_dev *pdev)
driver_remove_file(&altera_cvp_driver.driver, &driver_attr_chkcfg);
fpga_mgr_unregister(mgr);
pci_iounmap(pdev, conf->map);
if (conf->map)
pci_iounmap(pdev, conf->map);
pci_release_region(pdev, CVP_BAR);
pci_read_config_word(pdev, PCI_COMMAND, &cmd);
cmd &= ~PCI_COMMAND_MEMORY;