diff options
Diffstat (limited to 'patches.kzm9g/0004-serial-Fix-wakeup-init-logic-to-speed-up-startup.patch')
| -rw-r--r-- | patches.kzm9g/0004-serial-Fix-wakeup-init-logic-to-speed-up-startup.patch | 60 |
1 files changed, 0 insertions, 60 deletions
diff --git a/patches.kzm9g/0004-serial-Fix-wakeup-init-logic-to-speed-up-startup.patch b/patches.kzm9g/0004-serial-Fix-wakeup-init-logic-to-speed-up-startup.patch deleted file mode 100644 index 6a58103c6edb37..00000000000000 --- a/patches.kzm9g/0004-serial-Fix-wakeup-init-logic-to-speed-up-startup.patch +++ /dev/null @@ -1,60 +0,0 @@ -From da29566854e9ffb6770255fbd915184073d2d0b1 Mon Sep 17 00:00:00 2001 -From: Simon Glass <sjg@chromium.org> -Date: Thu, 19 Jan 2012 11:28:56 -0800 -Subject: serial: Fix wakeup init logic to speed up startup - -The synchronize_rcu() call resulting from making every serial driver -wake-up capable (commit b3b708fa) slows boot down on my Tegra2x system -(with CONFIG_PREEMPT disabled). - -But this is avoidable since it is the device_set_wakeup_enable() and then -subsequence disable which causes the delay. We might as well just make -the device wakeup capable but not actually enable it for wakeup until -needed. - -Effectively the current code does this: - - device_set_wakeup_capable(dev, 1); - device_set_wakeup_enable(dev, 1); - device_set_wakeup_enable(dev, 0); - -We can just drop the last two lines. - -Before this change my boot log says: -[ 0.227062] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled -[ 0.702928] serial8250.0: ttyS0 at MMIO 0x70006040 (irq = 69) is a Tegra - -after: -[ 0.227264] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled -[ 0.227983] serial8250.0: ttyS0 at MMIO 0x70006040 (irq = 69) is a Tegra - -for saving of 450ms. - -Suggested-by: Rafael J. Wysocki <rjw@sisk.pl> -Acked-by: Rafael J. Wysocki <rjw@sisk.pl> -Signed-off-by: Simon Glass <sjg@chromium.org> -Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> -(cherry picked from commit 773598357c0baf03081cf87f2b444f97744faf1e) - -Signed-off-by: Simon Horman <horms@verge.net.au> ---- - drivers/tty/serial/serial_core.c | 6 +++--- - 1 file changed, 3 insertions(+), 3 deletions(-) - ---- a/drivers/tty/serial/serial_core.c -+++ b/drivers/tty/serial/serial_core.c -@@ -2391,11 +2391,11 @@ int uart_add_one_port(struct uart_driver - */ - tty_dev = tty_register_device(drv->tty_driver, uport->line, uport->dev); - if (likely(!IS_ERR(tty_dev))) { -- device_init_wakeup(tty_dev, 1); -- device_set_wakeup_enable(tty_dev, 0); -- } else -+ device_set_wakeup_capable(tty_dev, 1); -+ } else { - printk(KERN_ERR "Cannot register tty device on line %d\n", - uport->line); -+ } - - /* - * Ensure UPF_DEAD is not set. |