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| author | Frans Klaver <frans.klaver@xsens.com> | 2014-11-06 21:10:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-06 15:01:03 -0800 |
| commit | c904375d4b15122c225c1073fd7a56bd541b0ce5 (patch) | |
| tree | c552144cfd34a05428db130e6ceffe2431ec78a5 | |
| parent | 8a8ae62f8296760a2a1eee7009a1444c327603e0 (diff) | |
| download | linux-c904375d4b15122c225c1073fd7a56bd541b0ce5.tar.bz2 | |
serial: 8250_core: actually limit char reads to max_count
In serial8250_rx_chars(), max_count is set to 256. Due to the
post-decrement operator used in the while() condition, the maximum
number of iterations actually 257. This is not a problem, but it is
mildly surprising if you're debugging. Use pre-decrement instead.
Signed-off-by: Frans Klaver <frans.klaver@xsens.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 30522d680014..d0d0c3b6af02 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1501,7 +1501,7 @@ serial8250_rx_chars(struct uart_8250_port *up, unsigned char lsr) ignore_char: lsr = serial_in(up, UART_LSR); - } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (max_count-- > 0)); + } while ((lsr & (UART_LSR_DR | UART_LSR_BI)) && (--max_count > 0)); spin_unlock(&port->lock); tty_flip_buffer_push(&port->state->port); spin_lock(&port->lock); |