96 lines
2.5 KiB
Diff
96 lines
2.5 KiB
Diff
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From 6294c84872b0d26111bdd1b9e5fec41c8a087443 Mon Sep 17 00:00:00 2001
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From: mokopatches <mokopatches@openmoko.org>
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Date: Fri, 25 Jul 2008 22:21:23 +0100
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Subject: [PATCH] fix-EVIOCGRAB-semantics.patch
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---
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drivers/input/evdev.c | 32 +++++++++++++++-----------------
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1 files changed, 15 insertions(+), 17 deletions(-)
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diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
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index b32984b..499ffe1 100644
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--- a/drivers/input/evdev.c
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+++ b/drivers/input/evdev.c
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@@ -28,7 +28,7 @@ struct evdev {
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char name[16];
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struct input_handle handle;
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wait_queue_head_t wait;
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- struct evdev_client *grab;
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+ int *grab;
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struct list_head client_list;
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spinlock_t client_lock; /* protects client_list */
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struct mutex mutex;
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@@ -39,6 +39,7 @@ struct evdev_client {
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struct input_event buffer[EVDEV_BUFFER_SIZE];
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int head;
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int tail;
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+ int grab;
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spinlock_t buffer_lock; /* protects access to buffer, head and tail */
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struct fasync_struct *fasync;
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struct evdev *evdev;
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@@ -79,12 +80,8 @@ static void evdev_event(struct input_handle *handle,
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rcu_read_lock();
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- client = rcu_dereference(evdev->grab);
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- if (client)
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+ list_for_each_entry_rcu(client, &evdev->client_list, node)
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evdev_pass_event(client, &event);
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- else
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- list_for_each_entry_rcu(client, &evdev->client_list, node)
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- evdev_pass_event(client, &event);
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rcu_read_unlock();
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@@ -136,14 +133,15 @@ static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
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{
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int error;
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- if (evdev->grab)
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+ if (client->grab)
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return -EBUSY;
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- error = input_grab_device(&evdev->handle);
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- if (error)
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- return error;
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-
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- rcu_assign_pointer(evdev->grab, client);
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+ if (!evdev->grab++) {
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+ error = input_grab_device(&evdev->handle);
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+ if (error)
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+ return error;
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+ }
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+ client->grab = 1;
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synchronize_rcu();
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return 0;
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@@ -151,12 +149,12 @@ static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
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static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
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{
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- if (evdev->grab != client)
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+ if (!client->grab)
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return -EINVAL;
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- rcu_assign_pointer(evdev->grab, NULL);
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- synchronize_rcu();
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- input_release_device(&evdev->handle);
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+ if (!--evdev->grab && evdev->exist)
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+ input_release_device(&evdev->handle);
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+ client->grab = 0;
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return 0;
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}
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@@ -231,7 +229,7 @@ static int evdev_release(struct inode *inode, struct file *file)
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struct evdev *evdev = client->evdev;
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mutex_lock(&evdev->mutex);
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- if (evdev->grab == client)
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+ if (client->grab)
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evdev_ungrab(evdev, client);
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mutex_unlock(&evdev->mutex);
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--
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1.5.6.3
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