From 92eb77d0ffbaa71b501a0a8dabf09a351bf4267f Mon Sep 17 00:00:00 2001 From: Daniel Stone Date: Thu, 31 Oct 2013 07:25:34 +0000 Subject: Input: evdev - fall back to vmalloc for client event buffer evdev always tries to allocate the event buffer for clients using kzalloc rather than vmalloc, presumably to avoid mapping overhead where possible. However, drivers like bcm5974, which claims support for reporting 16 fingers simultaneously, can have an extraordinarily large buffer. The resultant contiguous order-4 allocation attempt fails due to fragmentation, and the device is thus unusable until reboot. Try kzalloc if we can to avoid the mapping overhead, but if that fails, fall back to vzalloc. Signed-off-by: Daniel Stone Signed-off-by: Dmitry Torokhov --- diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index b6ded17..a06e125 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -18,6 +18,8 @@ #include #include #include +#include +#include #include #include #include @@ -369,7 +371,11 @@ static int evdev_release(struct inode *inode, struct file *file) mutex_unlock(&evdev->mutex); evdev_detach_client(evdev, client); - kfree(client); + + if (is_vmalloc_addr(client)) + vfree(client); + else + kfree(client); evdev_close_device(evdev); @@ -389,12 +395,14 @@ static int evdev_open(struct inode *inode, struct file *file) { struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); + unsigned int size = sizeof(struct evdev_client) + + bufsize * sizeof(struct input_event); struct evdev_client *client; int error; - client = kzalloc(sizeof(struct evdev_client) + - bufsize * sizeof(struct input_event), - GFP_KERNEL); + client = kzalloc(size, GFP_KERNEL | __GFP_NOWARN); + if (!client) + client = vzalloc(size); if (!client) return -ENOMEM; -- cgit v0.9.2