Messages in this thread Patch in this message | | | From | Alan Tull <> | Subject | [PATCH 1/4] fpga: altera-cvp: fix 'bad IO access' on x86_64 | Date | Wed, 7 Nov 2018 11:51:45 -0600 |
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From: Anatolij Gustschin <agust@denx.de>
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> --- drivers/fpga/altera-cvp.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c index 610a155..144fa2a 100644 --- a/drivers/fpga/altera-cvp.c +++ b/drivers/fpga/altera-cvp.c @@ -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; -- 2.7.4
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