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    Subject[PATCH 4.19 12/46] HID: uhid: Fix returning EPOLLOUT from uhid_char_poll
    Date
    From: Marcel Holtmann <marcel@holtmann.org>

    commit be54e7461ffdc5809b67d2aeefc1ddc9a91470c7 upstream.

    Always return EPOLLOUT from uhid_char_poll to allow polling /dev/uhid
    for writable state.

    Fixes: 1f9dec1e0164 ("HID: uhid: allow poll()'ing on uhid devices")
    Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
    Cc: stable@vger.kernel.org
    Signed-off-by: Jiri Kosina <jkosina@suse.cz>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/hid/uhid.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/hid/uhid.c
    +++ b/drivers/hid/uhid.c
    @@ -775,7 +775,7 @@ static __poll_t uhid_char_poll(struct fi
    if (uhid->head != uhid->tail)
    return EPOLLIN | EPOLLRDNORM;

    - return 0;
    + return EPOLLOUT | EPOLLWRNORM;
    }

    static const struct file_operations uhid_fops = {

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