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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:28:00 +0000 |
commit | 3565071f226432336a54d0193d729fa4508a3394 (patch) | |
tree | 4cde13f078f84c0a7785d234fd52edce7c90546a /debian/patches-rt/0130-serial-core-Provide-low-level-functions-to-port-lock.patch | |
parent | Adding upstream version 6.6.15. (diff) | |
download | linux-3565071f226432336a54d0193d729fa4508a3394.tar.xz linux-3565071f226432336a54d0193d729fa4508a3394.zip |
Adding debian version 6.6.15-2.debian/6.6.15-2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | debian/patches-rt/0130-serial-core-Provide-low-level-functions-to-port-lock.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/debian/patches-rt/0130-serial-core-Provide-low-level-functions-to-port-lock.patch b/debian/patches-rt/0130-serial-core-Provide-low-level-functions-to-port-lock.patch new file mode 100644 index 0000000000..e8e506fe52 --- /dev/null +++ b/debian/patches-rt/0130-serial-core-Provide-low-level-functions-to-port-lock.patch @@ -0,0 +1,43 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Mon, 11 Dec 2023 09:19:18 +0000 +Subject: [PATCH 130/134] serial: core: Provide low-level functions to port + lock +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.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 <john.ogness@linutronix.de> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + 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); |