Commit 004b50f4 authored Dec 03, 2008 by David Howells Committed by Linus Torvalds Dec 03, 2008

MN10300: Introduce barriers to replace removed volatiles in gdbstub 16550 driver

Introduce into the MN10300 gdbstub 16550 driver a couple of barrier() calls to
replace the removed volatility of the input/output index variables for the Rx
ring buffer. A previous patch added them into the on-chip serial port driver.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 8711cca2

arch/mn10300/kernel/gdb-io-serial.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -99,6 +99,7 @@ int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)
		try_again:
		/* pull chars out of the buffer */
		ix = gdbstub_rx_outp;
		barrier();
		if (ix == gdbstub_rx_inp) {
		if (nonblock)
		return -EAGAIN;
		@@ -110,6 +111,7 @@ int gdbstub_io_rx_char(unsigned char *_ch, int nonblock)

		ch = gdbstub_rx_buffer[ix++];
		st = gdbstub_rx_buffer[ix++];
		barrier();
		gdbstub_rx_outp = ix & 0x00000fff;

		if (st & UART_LSR_BI) {

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