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| author | Antonio Borneo <borneo.antonio@gmail.com> | 2015-06-21 14:20:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-10 12:21:55 -0700 |
| commit | 103c46c95b48b228c98a8751726ab3bd9e90b525 (patch) | |
| tree | c0da40740f0fed9c43657ca5f0037f1b2128368d /drivers | |
| parent | 5ca991392ffc8fb1aaff9008fb3a2471ce578120 (diff) | |
HID: cp2112: fix to force single data-report reply
commit 6debce6f4e787a8eb4cec94e7afa85fb4f40db27 upstream.
Current implementation of cp2112_raw_event() only accepts one data report at a
time. If last received data report is not fully handled yet, a new incoming
data report will overwrite it. In such case we don't guaranteed to propagate
the correct incoming data.
The trivial fix implemented here forces a single report at a time by requesting
in cp2112_read() no more than 61 byte of data, which is the payload size of a
single data report.
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: Ellen Wang <ellen@cumulusnetworks.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hid/hid-cp2112.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hid/hid-cp2112.c b/drivers/hid/hid-cp2112.c index 3318de690e00..a2dbbbe0d8d7 100644 --- a/drivers/hid/hid-cp2112.c +++ b/drivers/hid/hid-cp2112.c @@ -356,6 +356,8 @@ static int cp2112_read(struct cp2112_device *dev, u8 *data, size_t size) struct cp2112_force_read_report report; int ret; + if (size > sizeof(dev->read_data)) + size = sizeof(dev->read_data); report.report = CP2112_DATA_READ_FORCE_SEND; report.length = cpu_to_be16(size); |