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Input: pxrc - fix freeing URB on device teardown

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URB is the only resource that is not managed, and thus is destroyed too early,
before we unregister input device and stop URB in pxrc_close(). To fix it let's
install custom devm handler to free the URB at the right time in devm unwind
sequence.

Reviewed-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Tested-by: Marcus Folkesson <marcus.folkesson@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Dmitry Torokhov 2018-07-18 18:03:36 +00:00
parent 9730f60888
commit 34dad2cf11
1 changed files with 30 additions and 36 deletions
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66
drivers/input/joystick/pxrc.c
View file

@ -119,49 +119,52 @@ static void pxrc_close(struct input_dev *input)
mutex_unlock(&pxrc->pm_mutex);
}
static void pxrc_free_urb(void *_pxrc)
{
struct pxrc *pxrc = _pxrc;
usb_free_urb(pxrc->urb);
}
static int pxrc_usb_init(struct pxrc *pxrc)
{
struct usb_device *udev = interface_to_usbdev(pxrc->intf);
struct usb_endpoint_descriptor *epirq;
unsigned int pipe;
int retval;
int error;
/* Set up the endpoint information */
/* This device only has an interrupt endpoint */
retval = usb_find_common_endpoints(pxrc->intf->cur_altsetting,
NULL, NULL, &epirq, NULL);
if (retval) {
dev_err(&pxrc->intf->dev,
"Could not find endpoint\n");
goto error;
error = usb_find_common_endpoints(pxrc->intf->cur_altsetting,
NULL, NULL, &epirq, NULL);
if (error) {
dev_err(&pxrc->intf->dev, "Could not find endpoint\n");
return error;
}
pxrc->bsize = usb_endpoint_maxp(epirq);
pxrc->epaddr = epirq->bEndpointAddress;
pxrc->data = devm_kmalloc(&pxrc->intf->dev, pxrc->bsize, GFP_KERNEL);
if (!pxrc->data) {
retval = -ENOMEM;
goto error;
}
if (!pxrc->data)
return -ENOMEM;
usb_set_intfdata(pxrc->intf, pxrc);
usb_make_path(udev, pxrc->phys, sizeof(pxrc->phys));
strlcat(pxrc->phys, "/input0", sizeof(pxrc->phys));
pxrc->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!pxrc->urb) {
retval = -ENOMEM;
goto error;
}
if (!pxrc->urb)
return -ENOMEM;
error = devm_add_action_or_reset(&pxrc->intf->dev, pxrc_free_urb, pxrc);
if (error)
return error;
pipe = usb_rcvintpipe(udev, pxrc->epaddr),
usb_fill_int_urb(pxrc->urb, udev, pipe, pxrc->data, pxrc->bsize,
pxrc_usb_irq, pxrc, 1);
error:
return retval;
return 0;
}
static int pxrc_input_init(struct pxrc *pxrc)
@ -197,7 +200,7 @@ static int pxrc_probe(struct usb_interface *intf,
const struct usb_device_id *id)
{
struct pxrc *pxrc;
int retval;
int error;
pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
if (!pxrc)
@ -206,29 +209,20 @@ static int pxrc_probe(struct usb_interface *intf,
mutex_init(&pxrc->pm_mutex);
pxrc->intf = intf;
retval = pxrc_usb_init(pxrc);
if (retval)
goto error;
error = pxrc_usb_init(pxrc);
if (error)
return error;
retval = pxrc_input_init(pxrc);
if (retval)
goto err_free_urb;
error = pxrc_input_init(pxrc);
if (error)
return error;
return 0;
err_free_urb:
usb_free_urb(pxrc->urb);
error:
return retval;
}
static void pxrc_disconnect(struct usb_interface *intf)
{
struct pxrc *pxrc = usb_get_intfdata(intf);
usb_free_urb(pxrc->urb);
usb_set_intfdata(intf, NULL);
/* All driver resources are devm-managed. */
}
static int pxrc_suspend(struct usb_interface *intf, pm_message_t message)