Software Flow Control Problem in UART.C

Prabhakar Kalasani kalasani at
Tue Jul 20 22:14:01 EST 2004

Hi all,

When I tried to use Software Flow Control it's not working with uart.c
driver in kernel 2.4.2 , I send Ctrl+S character to stop the flow but the
flow is not get stopped ,
I dig something into driver and find like,

static void rs_8xx_stop(struct tty_struct *tty)

static void rs_8xx_start(struct tty_struct *tty)

these two modules are handling with the flow stop(Ctrl+S) and start(Ctrl+Q)
I think there is a BUG in handling the Event(SCCE) and Mask Registers (SCCM)
somewhere like

	if (info->state->smc_scc_num & NUM_IS_SCC) {
		sccp = &cpmp->cp_scc[idx];
		sccp->scc_sccm &= ~UART_SCCM_TX;

Anybody got this problem and solved please let me know

Thanks in Advance,

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