[PATCH 5/9] can: peak/pci: fix potential bug when probe() fails
flat view
STALE3249d
From: Marc Kleine-Budde <mkl@pengutronix.de>
Date: 2017-12-01 14:17:35
Also in:
linux-can, stable
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
From: Stephane Grosjean <redacted> 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 <redacted> Cc: linux-stable <redacted> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- drivers/net/can/peak_canfd/peak_pciefd_main.c | 5 ++++- drivers/net/can/sja1000/peak_pci.c | 5 ++++- 2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/peak_canfd/peak_pciefd_main.c b/drivers/net/can/peak_canfd/peak_pciefd_main.c
index b4efd711f824..788c3464a3b0 100644
--- a/drivers/net/can/peak_canfd/peak_pciefd_main.c
+++ b/drivers/net/can/peak_canfd/peak_pciefd_main.c@@ -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: */
diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
index 131026fbc2d7..5adc95c922ee 100644
--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c@@ -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)
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2.15.0