From 0d2070c46e5b69f9b7b269b300d1b06344125f0e Mon Sep 17 00:00:00 2001 From: Thomas Gleixner <tglx@linutronix.de> Date: Thu, 28 Jul 2011 13:32:57 +0200 Subject: [PATCH 145/166] tty/serial/omap: Make the locking RT aware The lock is a sleeping lock and local_irq_save() is not the optimsation we are looking for. Redo it to make it work on -RT and non-RT. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> --- drivers/tty/serial/omap-serial.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) Index: linux-5.15.32-rt39/drivers/tty/serial/omap-serial.c =================================================================== @ linux-5.15.32-rt39/drivers/tty/serial/omap-serial.c:1258 @ serial_omap_console_write(struct console unsigned int ier; int locked = 1; - local_irq_save(flags); - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) - locked = spin_trylock(&up->port.lock); + if (up->port.sysrq || oops_in_progress) + locked = spin_trylock_irqsave(&up->port.lock, flags); else - spin_lock(&up->port.lock); + spin_lock_irqsave(&up->port.lock, flags); /* * First save the IER then disable the interrupts @ linux-5.15.32-rt39/drivers/tty/serial/omap-serial.c:1288 @ serial_omap_console_write(struct console check_modem_status(up); if (locked) - spin_unlock(&up->port.lock); - local_irq_restore(flags); + spin_unlock_irqrestore(&up->port.lock, flags); } static int __init