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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-22 17:23:41 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-22 17:23:41 -1000
commitd32e5f44a5aeb9c1febaf16db45bf888a3f66725 (patch)
tree4ebd5550ea9ed5fc437233f3224fa1c0ea4e372c /drivers/input
parentc0a3a64e723324ae6dda53214061a71de63808c3 (diff)
parent05f5c38576475439f3124a3e6d62db68de83f7be (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull input fixes from Dmitry Torokhov: - fixes for two long standing issues (lock up and a crash) in force feedback handling in uinput driver - tweak to firmware update timing in Elan I2C touchpad driver. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: elan_i2c - extend Flash-Write delay Input: uinput - avoid crash when sending FF request to device going away Input: uinput - avoid FF flush when destroying device
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/ff-core.c13
-rw-r--r--drivers/input/misc/uinput.c57
-rw-r--r--drivers/input/mouse/elan_i2c_i2c.c2
3 files changed, 50 insertions, 22 deletions
diff --git a/drivers/input/ff-core.c b/drivers/input/ff-core.c
index 8f2042432c85..66a46c84e28f 100644
--- a/drivers/input/ff-core.c
+++ b/drivers/input/ff-core.c
@@ -237,9 +237,15 @@ int input_ff_erase(struct input_dev *dev, int effect_id, struct file *file)
EXPORT_SYMBOL_GPL(input_ff_erase);
/*
- * flush_effects - erase all effects owned by a file handle
+ * input_ff_flush - erase all effects owned by a file handle
+ * @dev: input device to erase effect from
+ * @file: purported owner of the effects
+ *
+ * This function erases all force-feedback effects associated with
+ * the given owner from specified device. Note that @file may be %NULL,
+ * in which case all effects will be erased.
*/
-static int flush_effects(struct input_dev *dev, struct file *file)
+int input_ff_flush(struct input_dev *dev, struct file *file)
{
struct ff_device *ff = dev->ff;
int i;
@@ -255,6 +261,7 @@ static int flush_effects(struct input_dev *dev, struct file *file)
return 0;
}
+EXPORT_SYMBOL_GPL(input_ff_flush);
/**
* input_ff_event() - generic handler for force-feedback events
@@ -343,7 +350,7 @@ int input_ff_create(struct input_dev *dev, unsigned int max_effects)
mutex_init(&ff->mutex);
dev->ff = ff;
- dev->flush = flush_effects;
+ dev->flush = input_ff_flush;
dev->event = input_ff_event;
__set_bit(EV_FF, dev->evbit);
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 022be0e22eba..443151de90c6 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -98,14 +98,15 @@ static int uinput_request_reserve_slot(struct uinput_device *udev,
uinput_request_alloc_id(udev, request));
}
-static void uinput_request_done(struct uinput_device *udev,
- struct uinput_request *request)
+static void uinput_request_release_slot(struct uinput_device *udev,
+ unsigned int id)
{
/* Mark slot as available */
- udev->requests[request->id] = NULL;
- wake_up(&udev->requests_waitq);
+ spin_lock(&udev->requests_lock);
+ udev->requests[id] = NULL;
+ spin_unlock(&udev->requests_lock);
- complete(&request->done);
+ wake_up(&udev->requests_waitq);
}
static int uinput_request_send(struct uinput_device *udev,
@@ -138,20 +139,22 @@ static int uinput_request_send(struct uinput_device *udev,
static int uinput_request_submit(struct uinput_device *udev,
struct uinput_request *request)
{
- int error;
+ int retval;
- error = uinput_request_reserve_slot(udev, request);
- if (error)
- return error;
+ retval = uinput_request_reserve_slot(udev, request);
+ if (retval)
+ return retval;
- error = uinput_request_send(udev, request);
- if (error) {
- uinput_request_done(udev, request);
- return error;
- }
+ retval = uinput_request_send(udev, request);
+ if (retval)
+ goto out;
wait_for_completion(&request->done);
- return request->retval;
+ retval = request->retval;
+
+ out:
+ uinput_request_release_slot(udev, request->id);
+ return retval;
}
/*
@@ -169,7 +172,7 @@ static void uinput_flush_requests(struct uinput_device *udev)
request = udev->requests[i];
if (request) {
request->retval = -ENODEV;
- uinput_request_done(udev, request);
+ complete(&request->done);
}
}
@@ -230,6 +233,18 @@ static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
return uinput_request_submit(udev, &request);
}
+static int uinput_dev_flush(struct input_dev *dev, struct file *file)
+{
+ /*
+ * If we are called with file == NULL that means we are tearing
+ * down the device, and therefore we can not handle FF erase
+ * requests: either we are handling UI_DEV_DESTROY (and holding
+ * the udev->mutex), or the file descriptor is closed and there is
+ * nobody on the other side anymore.
+ */
+ return file ? input_ff_flush(dev, file) : 0;
+}
+
static void uinput_destroy_device(struct uinput_device *udev)
{
const char *name, *phys;
@@ -297,6 +312,12 @@ static int uinput_create_device(struct uinput_device *udev)
dev->ff->playback = uinput_dev_playback;
dev->ff->set_gain = uinput_dev_set_gain;
dev->ff->set_autocenter = uinput_dev_set_autocenter;
+ /*
+ * The standard input_ff_flush() implementation does
+ * not quite work for uinput as we can't reasonably
+ * handle FF requests during device teardown.
+ */
+ dev->flush = uinput_dev_flush;
}
error = input_register_device(udev->dev);
@@ -939,7 +960,7 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
}
req->retval = ff_up.retval;
- uinput_request_done(udev, req);
+ complete(&req->done);
goto out;
case UI_END_FF_ERASE:
@@ -955,7 +976,7 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
}
req->retval = ff_erase.retval;
- uinput_request_done(udev, req);
+ complete(&req->done);
goto out;
}
diff --git a/drivers/input/mouse/elan_i2c_i2c.c b/drivers/input/mouse/elan_i2c_i2c.c
index 15b1330606c1..e19eb60b3d2f 100644
--- a/drivers/input/mouse/elan_i2c_i2c.c
+++ b/drivers/input/mouse/elan_i2c_i2c.c
@@ -598,7 +598,7 @@ static int elan_i2c_write_fw_block(struct i2c_client *client,
}
/* Wait for F/W to update one page ROM data. */
- msleep(20);
+ msleep(35);
error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val);
if (error) {

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