Merge tag 'gpio-v3.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull gpio fixes from Linus Walleij:
 "A small batch of GPIO fixes for the v3.15 series.  I expect more to
  come in but I'm a bit behind on mail, might as well get these to you
  right now:

   - Change a crucial semantic ordering in the GPIO irqchip helpers

   - Fix two nasty regressions in the ACPI gpiolib extensions"

* tag 'gpio-v3.15-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio / ACPI: Prevent potential wrap of GPIO value on OpRegion read
  gpio / ACPI: Don't crash on NULL chip->dev
  gpio: set data first, then chip and handler

2 files changed, 10 insertions, 4 deletions

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index bf0f8b476696..401add28933f 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -233,7 +233,7 @@ static void acpi_gpiochip_request_interrupts(struct acpi_gpio_chip *acpi_gpio)
 {
         struct gpio_chip *chip = acpi_gpio->chip;
 
-        if (!chip->dev || !chip->to_irq)
+        if (!chip->to_irq)
                 return;
 
         INIT_LIST_HEAD(&acpi_gpio->events);
@@ -253,7 +253,7 @@ static void acpi_gpiochip_free_interrupts(struct acpi_gpio_chip *acpi_gpio)
         struct acpi_gpio_event *event, *ep;
         struct gpio_chip *chip = acpi_gpio->chip;
 
-        if (!chip->dev || !chip->to_irq)
+        if (!chip->to_irq)
                 return;
 
         list_for_each_entry_safe_reverse(event, ep, &acpi_gpio->events, node) {
@@ -451,7 +451,7 @@ acpi_gpio_adr_space_handler(u32 function, acpi_physical_address address,
                 if (function == ACPI_WRITE)
                         gpiod_set_raw_value(desc, !!((1 << i) & *value));
                 else
-                        *value |= gpiod_get_raw_value(desc) << i;
+                        *value |= (u64)gpiod_get_raw_value(desc) << i;
         }
 
 out:
@@ -501,6 +501,9 @@ void acpi_gpiochip_add(struct gpio_chip *chip)
         acpi_handle handle;
         acpi_status status;
 
+        if (!chip || !chip->dev)
+                return;
+
         handle = ACPI_HANDLE(chip->dev);
         if (!handle)
                 return;
@@ -531,6 +534,9 @@ void acpi_gpiochip_remove(struct gpio_chip *chip)
         acpi_handle handle;
         acpi_status status;
 
+        if (!chip || !chip->dev)
+                return;
+
         handle = ACPI_HANDLE(chip->dev);
         if (!handle)
                 return;
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 761013f8b82f..f48817d97480 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1387,8 +1387,8 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
 {
         struct gpio_chip *chip = d->host_data;
 
-        irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
         irq_set_chip_data(irq, chip);
+        irq_set_chip_and_handler(irq, chip->irqchip, chip->irq_handler);
 #ifdef CONFIG_ARM
         set_irq_flags(irq, IRQF_VALID);
 #else