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Subject[PATCH 4.18 031/235] Input: pxrc - fix freeing URB on device teardown
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

[ Upstream commit 34dad2cf1104869ce2db2bddb34f8e6780c2ddaa ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/input/joystick/pxrc.c | 68 +++++++++++++++++++-----------------------
1 file changed, 31 insertions(+), 37 deletions(-)

--- a/drivers/input/joystick/pxrc.c
+++ b/drivers/input/joystick/pxrc.c
@@ -120,48 +120,51 @@ static void pxrc_close(struct input_dev
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_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(pxrc->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(pxrc->udev, pxrc->epaddr),
usb_fill_int_urb(pxrc->urb, pxrc->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_interfa
const struct usb_device_id *id)
{
struct pxrc *pxrc;
- int retval;
+ int error;

pxrc = devm_kzalloc(&intf->dev, sizeof(*pxrc), GFP_KERNEL);
if (!pxrc)
@@ -207,29 +210,20 @@ static int pxrc_probe(struct usb_interfa
pxrc->udev = usb_get_dev(interface_to_usbdev(intf));
pxrc->intf = intf;

- retval = pxrc_usb_init(pxrc);
- if (retval)
- goto error;
-
- retval = pxrc_input_init(pxrc);
- if (retval)
- goto err_free_urb;
+ error = pxrc_usb_init(pxrc);
+ if (error)
+ return error;
+
+ 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)

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