6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
[ Upstream commit 62c68e7cee332e08e625af3bca3318814086490d ]
More and more drivers rely on devres to manage their resources, however
if bus' probe() and release() methods are not trivial and control some
of resources as well (for example enable or disable clocks, or attach
device to a power domain), we need to make sure that driver-allocated
resources are released immediately after driver's remove() method
returns, and not postponed until driver core gets around to releasing
resources.
In case of HID we should not try to close the report and release
associated memory until after all devres callbacks are executed. To fix
that we open a new devres group before calling driver's probe() and
explicitly release it when we return from driver's remove().
This is similar to what we did for I2C bus in commit 5b5475826c52 ("i2c:
ensure timely release of driver-allocated resources"). It is tempting to
try and move this into driver core, but actually doing so is challenging,
we need to split bus' remove() method into pre- and post-remove methods,
which would make the logic even less clear.
Reported-by: Stephen Boyd <redacted>
Link: https://lore.kernel.org/r/20230505232417.1377393-1-swboyd@chromium.org (local)
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Jiri Kosina <redacted>
Stable-dep-of: 207853d46f7e ("HID: synchronize input before cleaning up a failed probe")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/hid/hid-core.c | 17 +++++++++++++++++
include/linux/hid.h | 1 +
2 files changed, 18 insertions(+)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index b09ff4cabd53a..6a0552884c7d7 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2666,6 +2666,10 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
if (!hid_check_device_match(hdev, hdrv, &id))
return -ENODEV;
+ hdev->devres_group_id = devres_open_group(&hdev->dev, NULL, GFP_KERNEL);
+ if (!hdev->devres_group_id)
+ return -ENOMEM;
+
/* reset the quirks that has been previously set */
hdev->quirks = hid_lookup_quirk(hdev);
hdev->driver = hdrv;
@@ -2678,7 +2682,16 @@ static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
}
+ /*
+ * Note that we are not closing the devres group opened above so
+ * even resources that were attached to the device after probe is
+ * run are released when hid_device_remove() is executed. This is
+ * needed as some drivers would allocate additional resources,
+ * for example when updating firmware.
+ */
+
if (ret) {
+ devres_release_group(&hdev->dev, hdev->devres_group_id);
hid_close_report(hdev);
hdev->driver = NULL;
}@@ -2721,6 +2734,10 @@ static void hid_device_remove(struct device *dev)
hdrv->remove(hdev);
else /* default remove */
hid_hw_stop(hdev);
+
+ /* Release all devres resources allocated by the driver */
+ devres_release_group(&hdev->dev, hdev->devres_group_id);
+
hid_close_report(hdev);
hdev->driver = NULL;
}
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 54b794c26f6e5..536a4750b905b 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -625,6 +625,7 @@ struct hid_device { /* device report descriptor */
struct semaphore driver_input_lock; /* protects the current driver */
struct device dev; /* device */
struct hid_driver *driver;
+ void *devres_group_id; /* ID of probe devres group */
struct hid_ll_driver *ll_driver;
struct mutex ll_open_lock;--
2.53.0