[PATCH 3.18 057/150] HID: i2c-hid: Do not free buffers in i2c_hid_stop()

Greg Kroah-Hartman
2015-01-14T07:26:59Z

From: Mika Westerberg <mika.westerberg@linux.intel.com>

commit 5b44c53aeb791757072be4a267255cedfff594fd upstream.

When a hid driver that uses i2c-hid as transport is unloaded, the hid core
will call i2c_hid_stop() which releases all the buffers associated with the
device. This includes also the command buffer.

Now, when the i2c-hid driver itself is unloaded it tries to power down the
device by sending it PWR_SLEEP command. Since the command buffer is already
released we get following crash:

[ 79.691459] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 79.691532] IP: [<ffffffffa05bc049>] __i2c_hid_command+0x49/0x310 [i2c_hid]
...
[ 79.693467] Call Trace:
[ 79.693494] [<ffffffff810424e1>] ? __unmask_ioapic+0x21/0x30
[ 79.693537] [<ffffffff81042855>] ? unmask_ioapic+0x25/0x40
[ 79.693581] [<ffffffffa05bc35b>] ? i2c_hid_set_power+0x4b/0xa0 [i2c_hid]
[ 79.693632] [<ffffffffa05bc3cf>] ? i2c_hid_runtime_resume+0x1f/0x30 [i2c_hid]
[ 79.693689] [<ffffffff814c08fb>] ? __rpm_callback+0x2b/0x70
[ 79.693733] [<ffffffff814c0961>] ? rpm_callback+0x21/0x90
[ 79.693776] [<ffffffff814c0dec>] ? rpm_resume+0x41c/0x600
[ 79.693820] [<ffffffff814c1e1c>] ? __pm_runtime_resume+0x4c/0x80
[ 79.693868] [<ffffffff814b8588>] ? __device_release_driver+0x28/0x100
[ 79.693917] [<ffffffff814b8d90>] ? driver_detach+0xa0/0xb0
[ 79.693959] [<ffffffff814b82cc>] ? bus_remove_driver+0x4c/0xb0
[ 79.694006] [<ffffffff810d1cfd>] ? SyS_delete_module+0x11d/0x1d0
[ 79.694054] [<ffffffff8165f107>] ? int_signal+0x12/0x17
[ 79.694095] [<ffffffff8165ee69>] ? system_call_fastpath+0x12/0x17

Fix this so that we only free buffers when the i2c-hid driver itself is
removed.

Fixes: 34f439e4afcd ("HID: i2c-hid: add runtime PM support")
Reported-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/hid/i2c-hid/i2c-hid.c | 5 -----
1 file changed, 5 deletions(-)

--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -706,12 +706,7 @@ static int i2c_hid_start(struct hid_devi

static void i2c_hid_stop(struct hid_device *hid)
{
- struct i2c_client *client = hid->driver_data;
- struct i2c_hid *ihid = i2c_get_clientdata(client);
-
hid->claimed = 0;
-
- i2c_hid_free_buffers(ihid);
}

static int i2c_hid_open(struct hid_device *hid)