diff options
Diffstat (limited to 'debian/patches-rt/tty_serial_omap__Make_the_locking_RT_aware.patch')
| -rw-r--r-- | debian/patches-rt/tty_serial_omap__Make_the_locking_RT_aware.patch | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/debian/patches-rt/tty_serial_omap__Make_the_locking_RT_aware.patch b/debian/patches-rt/tty_serial_omap__Make_the_locking_RT_aware.patch new file mode 100644 index 000000000..89d744740 --- /dev/null +++ b/debian/patches-rt/tty_serial_omap__Make_the_locking_RT_aware.patch @@ -0,0 +1,47 @@ +Subject: tty/serial/omap: Make the locking RT aware +From: Thomas Gleixner <tglx@linutronix.de> +Date: Thu Jul 28 13:32:57 2011 +0200 +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +From: Thomas Gleixner <tglx@linutronix.de> + +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(-) +--- +--- a/drivers/tty/serial/omap-serial.c ++++ b/drivers/tty/serial/omap-serial.c +@@ -1212,13 +1212,10 @@ 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 = uart_port_trylock(&up->port); ++ if (up->port.sysrq || oops_in_progress) ++ locked = uart_port_trylock_irqsave(&up->port, &flags); + else +- uart_port_lock(&up->port); ++ uart_port_lock_irqsave(&up->port, &flags); + + /* + * First save the IER then disable the interrupts +@@ -1245,8 +1242,7 @@ serial_omap_console_write(struct console + check_modem_status(up); + + if (locked) +- uart_port_unlock(&up->port); +- local_irq_restore(flags); ++ uart_port_unlock_irqrestore(&up->port, flags); + } + + static int __init |