From fb24ea52f78e0d595852e09e3a55697c8f442189 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Fri, 22 Feb 2019 17:14:59 +0000 Subject: drivers: Remove explicit invocations of mmiowb() mmiowb() is now implied by spin_unlock() on architectures that require it, so there is no reason to call it from driver code. This patch was generated using coccinelle: @mmiowb@ @@ - mmiowb(); and invoked as: $ for d in drivers include/linux/qed sound; do \ spatch --include-headers --sp-file mmiowb.cocci --dir $d --in-place; done NOTE: mmiowb() has only ever guaranteed ordering in conjunction with spin_unlock(). However, pairing each mmiowb() removal in this patch with the corresponding call to spin_unlock() is not at all trivial, so there is a small chance that this change may regress any drivers incorrectly relying on mmiowb() to order MMIO writes between CPUs using lock-free synchronisation. If you've ended up bisecting to this commit, you can reintroduce the mmiowb() calls using wmb() instead, which should restore the old behaviour on all architectures other than some esoteric ia64 systems. Acked-by: Linus Torvalds Signed-off-by: Will Deacon --- drivers/tty/serial/serial_txx9.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/tty/serial/serial_txx9.c') diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c index 1b4008d022bf..d22ccb32aa9b 100644 --- a/drivers/tty/serial/serial_txx9.c +++ b/drivers/tty/serial/serial_txx9.c @@ -248,7 +248,6 @@ static void serial_txx9_initialize(struct uart_port *port) sio_out(up, TXX9_SIFCR, TXX9_SIFCR_SWRST); /* TX4925 BUG WORKAROUND. Accessing SIOC register * immediately after soft reset causes bus error. */ - mmiowb(); udelay(1); while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout) udelay(1); -- cgit v1.2.3