1 files changed, 27 insertions, 53 deletions

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 1a8c18cbf201..8a29404985f1 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -57,9 +57,9 @@ struct gpio_desc {
 #define FLAG_TRIG_RISE  6       /* trigger on rising edge */
 #define FLAG_ACTIVE_LOW 7       /* sysfs value has active low */
 
-#define PDESC_ID_SHIFT  16      /* add new flags before this one */
+#define ID_SHIFT        16      /* add new flags before this one */
 
-#define GPIO_FLAGS_MASK         ((1 << PDESC_ID_SHIFT) - 1)
+#define GPIO_FLAGS_MASK         ((1 << ID_SHIFT) - 1)
 #define GPIO_TRIGGER_MASK       (BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE))
 
 #ifdef CONFIG_DEBUG_FS
@@ -69,12 +69,7 @@ struct gpio_desc {
 static struct gpio_desc gpio_desc[ARCH_NR_GPIOS];
 
 #ifdef CONFIG_GPIO_SYSFS
-struct poll_desc {
-        struct work_struct      work;
-        struct sysfs_dirent     *value_sd;
-};
-
-static struct idr pdesc_idr;
+static DEFINE_IDR(dirent_idr);
 #endif
 
 static inline void desc_set_label(struct gpio_desc *d, const char *label)
@@ -325,24 +320,16 @@ static const DEVICE_ATTR(value, 0644,
 
 static irqreturn_t gpio_sysfs_irq(int irq, void *priv)
 {
-        struct work_struct      *work = priv;
+        struct sysfs_dirent     *value_sd = priv;
 
-        schedule_work(work);
+        sysfs_notify_dirent(value_sd);
         return IRQ_HANDLED;
 }
 
-static void gpio_notify_sysfs(struct work_struct *work)
-{
-        struct poll_desc        *pdesc;
-
-        pdesc = container_of(work, struct poll_desc, work);
-        sysfs_notify_dirent(pdesc->value_sd);
-}
-
 static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
                 unsigned long gpio_flags)
 {
-        struct poll_desc        *pdesc;
+        struct sysfs_dirent     *value_sd;
         unsigned long           irq_flags;
         int                     ret, irq, id;
 
@@ -353,18 +340,16 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
         if (irq < 0)
                 return -EIO;
 
-        id = desc->flags >> PDESC_ID_SHIFT;
-        pdesc = idr_find(&pdesc_idr, id);
-        if (pdesc) {
-                free_irq(irq, &pdesc->work);
-                cancel_work_sync(&pdesc->work);
-        }
+        id = desc->flags >> ID_SHIFT;
+        value_sd = idr_find(&dirent_idr, id);
+        if (value_sd)
+                free_irq(irq, value_sd);
 
         desc->flags &= ~GPIO_TRIGGER_MASK;
 
         if (!gpio_flags) {
                 ret = 0;
-                goto free_sd;
+                goto free_id;
         }
 
         irq_flags = IRQF_SHARED;
@@ -375,55 +360,46 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
                 irq_flags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ?
                         IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING;
 
-        if (!pdesc) {
-                pdesc = kmalloc(sizeof(*pdesc), GFP_KERNEL);
-                if (!pdesc) {
-                        ret = -ENOMEM;
+        if (!value_sd) {
+                value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
+                if (!value_sd) {
+                        ret = -ENODEV;
                         goto err_out;
                 }
 
                 do {
                         ret = -ENOMEM;
-                        if (idr_pre_get(&pdesc_idr, GFP_KERNEL))
-                                ret = idr_get_new_above(&pdesc_idr,
-                                                pdesc, 1, &id);
+                        if (idr_pre_get(&dirent_idr, GFP_KERNEL))
+                                ret = idr_get_new_above(&dirent_idr, value_sd,
+                                                        1, &id);
                 } while (ret == -EAGAIN);
 
                 if (ret)
-                        goto free_mem;
+                        goto free_sd;
 
                 desc->flags &= GPIO_FLAGS_MASK;
-                desc->flags |= (unsigned long)id << PDESC_ID_SHIFT;
+                desc->flags |= (unsigned long)id << ID_SHIFT;
 
-                if (desc->flags >> PDESC_ID_SHIFT != id) {
+                if (desc->flags >> ID_SHIFT != id) {
                         ret = -ERANGE;
                         goto free_id;
                 }
-
-                pdesc->value_sd = sysfs_get_dirent(dev->kobj.sd, NULL, "value");
-                if (!pdesc->value_sd) {
-                        ret = -ENODEV;
-                        goto free_id;
-                }
-                INIT_WORK(&pdesc->work, gpio_notify_sysfs);
         }
 
         ret = request_irq(irq, gpio_sysfs_irq, irq_flags,
-                        "gpiolib", &pdesc->work);
+                                "gpiolib", value_sd);
         if (ret)
-                goto free_sd;
+                goto free_id;
 
         desc->flags |= gpio_flags;
         return 0;
 
-free_sd:
-        if (pdesc)
-                sysfs_put(pdesc->value_sd);
 free_id:
-        idr_remove(&pdesc_idr, id);
+        idr_remove(&dirent_idr, id);
         desc->flags &= GPIO_FLAGS_MASK;
-free_mem:
-        kfree(pdesc);
+free_sd:
+        if (value_sd)
+                sysfs_put(value_sd);
 err_out:
         return ret;
 }
@@ -994,8 +970,6 @@ static int __init gpiolib_sysfs_init(void)
         unsigned long   flags;
         unsigned        gpio;
 
-        idr_init(&pdesc_idr);
-
         status = class_register(&gpio_class);
         if (status < 0)
                 return status;