usb: gadget: u_serial: add missing port entry locking
gserial_alloc_line() misses locking (for a release barrier) while resetting port entry on TTY allocation failure. Fix this. Cc: stable@vger.kernel.org Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Tested-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
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@ -1239,8 +1239,10 @@ int gserial_alloc_line(unsigned char *line_num)
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__func__, port_num, PTR_ERR(tty_dev));
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ret = PTR_ERR(tty_dev);
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mutex_lock(&ports[port_num].lock);
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port = ports[port_num].port;
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ports[port_num].port = NULL;
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mutex_unlock(&ports[port_num].lock);
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gserial_free_port(port);
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goto err;
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}
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