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authorAnatolij Gustschin <agust@denx.de>2018-11-07 17:51:45 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-11 20:58:27 (GMT)
commit187fade88ca0ff2df9d360ca751d948d73db7095 (patch)
treea1fdcf21de6dc72cb7f1e0a68ead114f5be76702 /drivers/fpga
parent1e5106031f298af4ad29c2eb866780d9a21e9ab4 (diff)
fpga: altera-cvp: fix 'bad IO access' on x86_64
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>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/altera-cvp.c6
1 files 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;

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