Allocate the event buffer dynamically, and prepare to compute the buffer size in a separate function. This patch defines the size computation to be identical to the current code, and does not contain any logical changes. Signed-off-by: Henrik Rydberg <rydberg@xxxxxxxxxxx> --- drivers/input/evdev.c | 23 +++++++++++++++++++---- 1 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index 7f0c7da..2e2a339 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -10,7 +10,7 @@ #define EVDEV_MINOR_BASE 64 #define EVDEV_MINORS 32 -#define EVDEV_BUFFER_SIZE 64 +#define EVDEV_MIN_BUFFER_SIZE 64 #include <linux/poll.h> #include <linux/sched.h> @@ -35,7 +35,8 @@ struct evdev { struct mutex mutex; struct device dev; struct buflock_writer writer; - struct input_event buffer[EVDEV_BUFFER_SIZE]; + unsigned int bufsize; + struct input_event *buffer; }; struct evdev_client { @@ -74,7 +75,7 @@ static void evdev_event(struct input_handle *handle, event.value = value; /* lock-less write */ - buflock_write(evdev->writer, evdev->buffer, EVDEV_BUFFER_SIZE, event); + buflock_write(evdev->writer, evdev->buffer, evdev->bufsize, event); rcu_read_lock(); @@ -121,6 +122,7 @@ static void evdev_free(struct device *dev) struct evdev *evdev = container_of(dev, struct evdev, dev); input_put_device(evdev->handle.dev); + kfree(evdev->buffer); kfree(evdev); } @@ -333,7 +335,7 @@ static int evdev_fetch_next_event(struct evdev_client *client, have_event = !buflock_reader_empty(client->reader); if (have_event) buflock_read(client->reader, evdev->writer, - evdev->buffer, EVDEV_BUFFER_SIZE, *event); + evdev->buffer, evdev->bufsize, *event); spin_unlock_irq(&client->entry_lock); @@ -786,6 +788,11 @@ static void evdev_cleanup(struct evdev *evdev) } } +static int evdev_compute_buffer_size(struct input_dev *dev) +{ + return EVDEV_MIN_BUFFER_SIZE; +} + /* * Create new evdev device. Note that input core serializes calls * to connect and disconnect so we don't need to lock evdev_table here. @@ -830,6 +837,14 @@ static int evdev_connect(struct input_handler *handler, struct input_dev *dev, evdev->dev.release = evdev_free; device_initialize(&evdev->dev); + evdev->bufsize = evdev_compute_buffer_size(dev); + evdev->buffer = kzalloc(evdev->bufsize * sizeof(struct input_event), + GFP_KERNEL); + if (!evdev->buffer) { + error = -ENOMEM; + goto err_free_evdev; + } + error = input_register_handle(&evdev->handle); if (error) goto err_free_evdev; -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html