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Diffstat (limited to 'target/linux/generic/pending-4.9/890-uart_optional_sysrq.patch')
-rw-r--r--target/linux/generic/pending-4.9/890-uart_optional_sysrq.patch47
1 files changed, 47 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.9/890-uart_optional_sysrq.patch b/target/linux/generic/pending-4.9/890-uart_optional_sysrq.patch
new file mode 100644
index 0000000..7b62aeb
--- /dev/null
+++ b/target/linux/generic/pending-4.9/890-uart_optional_sysrq.patch
@@ -0,0 +1,47 @@
+From: John Crispin <john@phrozen.org>
+Subject: serial: do not accept sysrq characters via serial port
+
+many embedded boards have a disconnected TTL level serial which can
+generate some garbage that can lead to spurious false sysrq detects.
+
+[john@phrozen.org: sent upstream 22.12.2016]
+
+Signed-off-by: John Crispin <john@phrozen.org>
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+ include/linux/serial_core.h | 2 +-
+ lib/Kconfig.debug | 5 +++++
+ 2 files changed, 6 insertions(+), 1 deletion(-)
+
+diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
+index 344201437017..7e6165bc1cef 100644
+--- a/include/linux/serial_core.h
++++ b/include/linux/serial_core.h
+@@ -448,7 +448,7 @@ extern void uart_handle_cts_change(struct uart_port *uport,
+ extern void uart_insert_char(struct uart_port *port, unsigned int status,
+ unsigned int overrun, unsigned int ch, unsigned int flag);
+
+-#ifdef SUPPORT_SYSRQ
++#if defined(SUPPORT_SYSRQ) && defined(CONFIG_MAGIC_SYSRQ_SERIAL)
+ static inline int
+ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch)
+ {
+diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
+index a6c8db1d62f6..062c580cdd68 100644
+--- a/lib/Kconfig.debug
++++ b/lib/Kconfig.debug
+@@ -397,6 +397,11 @@ config MAGIC_SYSRQ_DEFAULT_ENABLE
+ This may be set to 1 or 0 to enable or disable them all, or
+ to a bitmask as described in Documentation/sysrq.txt.
+
++config MAGIC_SYSRQ_SERIAL
++ bool "Enable magic SysRq key over serial"
++ depends on MAGIC_SYSRQ
++ default y
++
+ config DEBUG_KERNEL
+ bool "Kernel debugging"
+ help
+--
+2.11.0
+