The patch titled 8250: fix serial transmitter fully empty test has been removed from the -mm tree. Its filename was 8250-serial-transmitter-fully-empty-test.patch This patch was dropped because it was nacked The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: 8250: fix serial transmitter fully empty test From: Dick Hollenbeck <dick@xxxxxxxxxxx> When controlling an industrial radio modem it can be necessary to manipulate the handshake lines in order to control the radio modem's transmitter, from userspace. The transmitter should not be turned off before all characters have been transmitted. serial8250_tx_empty() was reporting that all characters were transmitted before they actually were. Signed-off-by: Dick Hollenbeck <dick@xxxxxxxxxxx> Cc: Russell King <rmk@xxxxxxxxxxxxxxxx> Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- diff -puN drivers/serial/8250.c~8250-serial-transmitter-fully-empty-test drivers/serial/8250.c --- a/drivers/serial/8250.c~8250-serial-transmitter-fully-empty-test +++ a/drivers/serial/8250.c @@ -83,6 +83,9 @@ static unsigned int skip_txen_test; /* f #define PASS_LIMIT 256 +#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) + + /* * We default to IRQ0 for the "no irq" hack. Some * machine types want others as well - they're free @@ -1794,7 +1797,7 @@ static unsigned int serial8250_tx_empty( up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS; spin_unlock_irqrestore(&up->port.lock, flags); - return lsr & UART_LSR_TEMT ? TIOCSER_TEMT : 0; + return (lsr & BOTH_EMPTY) == BOTH_EMPTY ? TIOCSER_TEMT : 0; } static unsigned int serial8250_get_mctrl(struct uart_port *port) @@ -1852,8 +1855,6 @@ static void serial8250_break_ctl(struct spin_unlock_irqrestore(&up->port.lock, flags); } -#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) - /* * Wait for transmitter & holding register to empty */ _ Patches currently in -mm which might be from dick@xxxxxxxxxxx are 8250-serial-transmitter-fully-empty-test.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html