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| author | John Ogness <john.ogness@linutronix.de> | 2022-11-16 19:21:44 +0300 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2022-12-02 13:25:02 +0300 |
| commit | 6f8836756f3cbb02bfd1f0e033516585250318a9 (patch) | |
| tree | da70918f2ac3f0ad26c930085eabeab7b285a915 /include/linux/console.h | |
| parent | 2c6b4b7065a7006271a9c12b1a1e6c56dc6d3796 (diff) | |
| download | linux-6f8836756f3cbb02bfd1f0e033516585250318a9.tar.xz | |
printk, xen: fbfront: create/use safe function for forcing preferred
With commit 9e124fe16ff2("xen: Enable console tty by default in domU
if it's not a dummy") a hack was implemented to make sure that the
tty console remains the console behind the /dev/console device. The
main problem with the hack is that, after getting the console pointer
to the tty console, it is assumed the pointer is still valid after
releasing the console_sem. This assumption is incorrect and unsafe.
Make the hack safe by introducing a new function
console_force_preferred_locked() and perform the full operation
under the console_list_lock.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20221116162152.193147-33-john.ogness@linutronix.de
Diffstat (limited to 'include/linux/console.h')
| -rw-r--r-- | include/linux/console.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/console.h b/include/linux/console.h index f716e1dd9eaf..9cea254b34b8 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -291,6 +291,7 @@ enum con_flush_mode { }; extern int add_preferred_console(char *name, int idx, char *options); +extern void console_force_preferred_locked(struct console *con); extern void register_console(struct console *); extern int unregister_console(struct console *); extern void console_lock(void); |