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can: peak/pci: fix potential bug when probe() fails 

PCI/PCIe drivers for PEAK-System CAN/CAN-FD interfaces do some access to the
PCI config during probing. In case one of these accesses fails, a POSITIVE
PCIBIOS_xxx error code is returned back. This POSITIVE error code MUST be
converted into a NEGATIVE errno for the probe() function to indicate it
failed. Using the pcibios_err_to_errno() function, we make sure that the
return code will always be negative.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Stephane Grosjean 2017-11-23 15:44:35 +01:00 committed by Marc Kleine-Budde
parent f6c23b174c
commit 5c2cb02edf
2 changed files with 8 additions and 2 deletions
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5
drivers/net/can/peak_canfd/peak_pciefd_main.c
View File

@ -825,7 +825,10 @@ static int peak_pciefd_probe(struct pci_dev *pdev,
err_disable_pci:
pci_disable_device(pdev);
return err;
/* pci_xxx_config_word() return positive PCIBIOS_xxx error codes while
* the probe() function must return a negative errno in case of failure
* (err is unchanged if negative) */
return pcibios_err_to_errno(err);
}
/* free the board structure object, as well as its resources: */

5
drivers/net/can/sja1000/peak_pci.c
View File

@ -717,7 +717,10 @@ static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
failure_disable_pci:
pci_disable_device(pdev);
return err;
/* pci_xxx_config_word() return positive PCIBIOS_xxx error codes while
* the probe() function must return a negative errno in case of failure
* (err is unchanged if negative) */
return pcibios_err_to_errno(err);
}
static void peak_pci_remove(struct pci_dev *pdev)