Hello Christophe Ricard,
The patch dfa8070d7f64: "nfc: st21nfca: Add support for acpi probing
for i2c device." from Dec 23, 2015, leads to the following static
checker warning:
drivers/nfc/st21nfca/i2c.c:530 st21nfca_hci_i2c_acpi_request_resources()
error: 'gpiod_ena' dereferencing possible ERR_PTR()
drivers/nfc/st21nfca/i2c.c
507 static int st21nfca_hci_i2c_acpi_request_resources(struct i2c_client
*client)
508 {
509 struct st21nfca_i2c_phy *phy = i2c_get_clientdata(client);
510 const struct acpi_device_id *id;
511 struct gpio_desc *gpiod_ena;
512 struct device *dev;
513
514 if (!client)
515 return -EINVAL;
516
517 dev = &client->dev;
518
519 /* Match the struct device against a given list of ACPI IDs */
520 id = acpi_match_device(dev->driver->acpi_match_table, dev);
521 if (!id)
522 return -ENODEV;
523
524 /* Get EN GPIO from ACPI */
525 gpiod_ena = devm_gpiod_get_index(dev, ST21NFCA_GPIO_NAME_EN, 1,
526 GPIOD_OUT_LOW);
527 if (!IS_ERR(gpiod_ena))
528 phy->gpio_ena = desc_to_gpio(gpiod_ena);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is correct.
529
530 phy->gpio_ena = desc_to_gpio(gpiod_ena);
^^^^^^^^^^^^^^^^^^^^^^^
This will oops. Maybe just delete this line.
531
532 phy->irq_polarity = irq_get_trigger_type(client->irq);
533
534 phy->se_status.is_ese_present =
535 device_property_present(dev,
"ese-present");
536 phy->se_status.is_uicc_present =
537 device_property_present(dev,
"uicc-present");
538
539 return 0;
540 }
regards,
dan carpenter
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