From 27d3313807296c3943a96ceef8c2b7279cb56962 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 18 May 2024 19:39:59 +0200 Subject: Adding debian version 6.7.7-1. Signed-off-by: Daniel Baumann --- ...-Provide-low-level-functions-to-port-lock.patch | 42 ++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 debian/patches-rt/0046-serial-core-Provide-low-level-functions-to-port-lock.patch (limited to 'debian/patches-rt/0046-serial-core-Provide-low-level-functions-to-port-lock.patch') diff --git a/debian/patches-rt/0046-serial-core-Provide-low-level-functions-to-port-lock.patch b/debian/patches-rt/0046-serial-core-Provide-low-level-functions-to-port-lock.patch new file mode 100644 index 0000000000..b6c03021b1 --- /dev/null +++ b/debian/patches-rt/0046-serial-core-Provide-low-level-functions-to-port-lock.patch @@ -0,0 +1,42 @@ +From: John Ogness +Date: Mon, 11 Dec 2023 09:19:18 +0000 +Subject: [PATCH 46/50] serial: core: Provide low-level functions to port lock +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.7/older/patches-6.7-rt6.tar.xz + +The nbcon console's driver_enter() and driver_exit() callbacks need +to lock the port lock in order to synchronize against other hardware +activity (such as adjusting baud rates). However, they cannot use +the uart_port_lock() wrappers because the printk subsystem will +perform nbcon locking after calling the driver_enter() callback. + +Provide low-level variants __uart_port_lock_irqsave() and +__uart_port_unlock_irqrestore() for this purpose. These are only +to be used by the driver_enter()/driver_exit() callbacks. + +Signed-off-by: John Ogness +Signed-off-by: Sebastian Andrzej Siewior +--- + include/linux/serial_core.h | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +--- a/include/linux/serial_core.h ++++ b/include/linux/serial_core.h +@@ -681,6 +681,18 @@ static inline void uart_port_unlock_irqr + spin_unlock_irqrestore(&up->lock, flags); + } + ++/* Only for use in the console->driver_enter() callback. */ ++static inline void __uart_port_lock_irqsave(struct uart_port *up, unsigned long *flags) ++{ ++ spin_lock_irqsave(&up->lock, *flags); ++} ++ ++/* Only for use in the console->driver_exit() callback. */ ++static inline void __uart_port_unlock_irqrestore(struct uart_port *up, unsigned long flags) ++{ ++ spin_unlock_irqrestore(&up->lock, flags); ++} ++ + static inline int serial_port_in(struct uart_port *up, int offset) + { + return up->serial_in(up, offset); -- cgit v1.2.3