diff -urN oldtree/include/linux/console.h newtree/include/linux/console.h --- oldtree/include/linux/console.h 2006-08-18 15:01:22.000000000 -0400 +++ newtree/include/linux/console.h 2006-08-20 04:35:26.998062250 -0400 @@ -120,9 +120,14 @@ extern void console_start(struct console *); extern int is_console_locked(void); +#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND /* Suspend and resume console messages over PM events */ extern void suspend_console(void); extern void resume_console(void); +#else +static inline void suspend_console(void) {} +static inline void resume_console(void) {} +#endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */ /* Some debug stub to catch some of the obvious races in the VT code */ #if 1 diff -urN oldtree/kernel/power/Kconfig newtree/kernel/power/Kconfig --- oldtree/kernel/power/Kconfig 2006-08-18 15:01:22.000000000 -0400 +++ newtree/kernel/power/Kconfig 2006-08-20 04:35:27.006062750 -0400 @@ -36,6 +36,17 @@ code. This is helpful when debugging and reporting various PM bugs, like suspend support. +config PM_DISABLE_CONSOLE_SUSPEND + bool "Keep console(s) enabled during suspend/resume (DANGEROUS)" + depends on PM && PM_DEBUG + default n + ---help--- + This option turns off the console suspend mechanism that prevents + debug messages from reaching the console during the suspend/resume + operations. This may be helpful when debugging device drivers' + suspend/resume routines, but may itself lead to problems, for example + if netconsole is used. + config PM_TRACE bool "Suspend/resume event tracing" depends on PM && PM_DEBUG && X86_32 && EXPERIMENTAL diff -urN oldtree/kernel/printk.c newtree/kernel/printk.c --- oldtree/kernel/printk.c 2006-08-18 15:01:22.000000000 -0400 +++ newtree/kernel/printk.c 2006-08-20 04:35:27.038064750 -0400 @@ -702,6 +702,7 @@ return 0; } +#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND /** * suspend_console - suspend the console subsystem * @@ -709,8 +710,14 @@ */ void suspend_console(void) { + printk("Suspending console(s)\n"); acquire_console_sem(); console_suspended = 1; + /* This is needed so that all of the messages that have already been + * written to all consoles can be actually transmitted (eg. over a + * network) before we try to suspend the consoles' devices. + */ + ssleep(2); } void resume_console(void) @@ -718,6 +725,7 @@ console_suspended = 0; release_console_sem(); } +#endif /* CONFIG_DISABLE_CONSOLE_SUSPEND */ /** * acquire_console_sem - lock the console system for exclusive use.