tty: n_gsm: replace kicktimer with delayed_work
A kick_timer timer_list is replaced with kick_timeout delayed_work to be able to synchronize with mutexes as a prerequisite for the introduction of tx_mutex. Found by Linux Verification Center (linuxtesting.org) with Syzkaller. Fixes: c568f708 ("tty: n_gsm: fix missing timer to handle stalled links") Cc: stable <stable@kernel.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Suggested-by: Hillf Danton <hdanton@sina.com> Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru> Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Link: https://lore.kernel.org/r/20220829131640.69254-2-pchelkin@ispras.ruSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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