diff options
| author | James Morris <james.morris@microsoft.com> | 2019-01-10 11:41:59 -0800 |
|---|---|---|
| committer | James Morris <james.morris@microsoft.com> | 2019-01-10 11:41:59 -0800 |
| commit | 49e41801b335f64610bbfd23e8f2bbaf34d46276 (patch) | |
| tree | 4fbedacd1de1bbd4054f07f93031aebcb7b7a919 /include/linux/serial_core.h | |
| parent | b49d564344f773d8afee982153c8493e5f2eaf38 (diff) | |
| parent | bfeffd155283772bbe78c6a05dec7c0128ee500c (diff) | |
Merge tag 'v5.0-rc1' into next-general
Linux 5.0-rc1
Sync to pick up LSM stacking work (which is based on -rc1).
Diffstat (limited to 'include/linux/serial_core.h')
| -rw-r--r-- | include/linux/serial_core.h | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 047fa67d039b..5fe2b037e833 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -22,6 +22,7 @@ #include <linux/bitops.h> #include <linux/compiler.h> +#include <linux/console.h> #include <linux/interrupt.h> #include <linux/circ_buf.h> #include <linux/spinlock.h> @@ -175,6 +176,7 @@ struct uart_port { struct console *cons; /* struct console, if any */ #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(SUPPORT_SYSRQ) unsigned long sysrq; /* sysrq timeout */ + unsigned int sysrq_ch; /* char for sysrq */ #endif /* flags must be updated while holding port mutex */ @@ -485,8 +487,42 @@ uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) } return 0; } +static inline int +uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) +{ + if (port->sysrq) { + if (ch && time_before(jiffies, port->sysrq)) { + port->sysrq_ch = ch; + port->sysrq = 0; + return 1; + } + port->sysrq = 0; + } + return 0; +} +static inline void +uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags) +{ + int sysrq_ch; + + sysrq_ch = port->sysrq_ch; + port->sysrq_ch = 0; + + spin_unlock_irqrestore(&port->lock, irqflags); + + if (sysrq_ch) + handle_sysrq(sysrq_ch); +} #else -#define uart_handle_sysrq_char(port,ch) ({ (void)port; 0; }) +static inline int +uart_handle_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; } +static inline int +uart_prepare_sysrq_char(struct uart_port *port, unsigned int ch) { return 0; } +static inline void +uart_unlock_and_check_sysrq(struct uart_port *port, unsigned long irqflags) +{ + spin_unlock_irqrestore(&port->lock, irqflags); +} #endif /* |