Merge tag 'gpio-v4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[sfrench/cifs-2.6.git] / drivers / gpio / gpiolib.c
index 17dc23055755a5045797faafc643ca2a371efb20..230e41562462b27fdf5d11874b3de8c34c107707 100644 (file)
@@ -582,7 +582,7 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
                if (ret)
                        goto out_free_descs;
                lh->descs[i] = desc;
-               count = i;
+               count = i + 1;
 
                if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW)
                        set_bit(FLAG_ACTIVE_LOW, &desc->flags);
@@ -1692,7 +1692,8 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip,
                irq_set_chained_handler_and_data(parent_irq, parent_handler,
                                                 gpiochip);
 
-               gpiochip->irq.parents = &parent_irq;
+               gpiochip->irq.parent_irq = parent_irq;
+               gpiochip->irq.parents = &gpiochip->irq.parent_irq;
                gpiochip->irq.num_parents = 1;
        }
 }
@@ -4129,8 +4130,23 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
         * the device name as label
         */
        status = gpiod_request(desc, con_id ? con_id : devname);
-       if (status < 0)
-               return ERR_PTR(status);
+       if (status < 0) {
+               if (status == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) {
+                       /*
+                        * This happens when there are several consumers for
+                        * the same GPIO line: we just return here without
+                        * further initialization. It is a bit if a hack.
+                        * This is necessary to support fixed regulators.
+                        *
+                        * FIXME: Make this more sane and safe.
+                        */
+                       dev_info(dev, "nonexclusive access to GPIO for %s\n",
+                                con_id ? con_id : devname);
+                       return desc;
+               } else {
+                       return ERR_PTR(status);
+               }
+       }
 
        status = gpiod_configure_flags(desc, con_id, lookupflags, flags);
        if (status < 0) {