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Merge branch 'console-registration-cleanup' into for-linus

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This commit is contained in:
Petr Mladek 2022-01-10 12:15:08 +01:00
commit d12013c80e
1 changed files with 58 additions and 46 deletions
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104
kernel/printk/printk.c
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@ -280,7 +280,6 @@ static struct console *exclusive_console;
static struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES];
static int preferred_console = -1;
static bool has_preferred_console;
int console_set_on_cmdline;
EXPORT_SYMBOL(console_set_on_cmdline);
@ -2861,7 +2860,8 @@ early_param("keep_bootcon", keep_bootcon_setup);
* Care need to be taken with consoles that are statically
* enabled such as netconsole
*/
static int try_enable_new_console(struct console *newcon, bool user_specified)
static int try_enable_preferred_console(struct console *newcon,
bool user_specified)
{
struct console_cmdline *c;
int i, err;
@ -2891,10 +2891,8 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
return err;
}
newcon->flags |= CON_ENABLED;
if (i == preferred_console) {
if (i == preferred_console)
newcon->flags |= CON_CONSDEV;
has_preferred_console = true;
}
return 0;
}
@ -2909,6 +2907,21 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
return -ENOENT;
}
/* Try to enable the console unconditionally */
static void try_enable_default_console(struct console *newcon)
{
if (newcon->index < 0)
newcon->index = 0;
if (newcon->setup && newcon->setup(newcon, NULL) != 0)
return;
newcon->flags |= CON_ENABLED;
if (newcon->device)
newcon->flags |= CON_CONSDEV;
}
/*
* The console driver calls this routine during kernel initialization
* to register the console printing procedure with printk() and to
@ -2930,59 +2943,56 @@ static int try_enable_new_console(struct console *newcon, bool user_specified)
*/
void register_console(struct console *newcon)
{
struct console *bcon = NULL;
struct console *con;
bool bootcon_enabled = false;
bool realcon_enabled = false;
int err;
for_each_console(bcon) {
if (WARN(bcon == newcon, "console '%s%d' already registered\n",
bcon->name, bcon->index))
for_each_console(con) {
if (WARN(con == newcon, "console '%s%d' already registered\n",
con->name, con->index))
return;
}
/*
* before we register a new CON_BOOT console, make sure we don't
* already have a valid console
*/
if (newcon->flags & CON_BOOT) {
for_each_console(bcon) {
if (!(bcon->flags & CON_BOOT)) {
pr_info("Too late to register bootconsole %s%d\n",
newcon->name, newcon->index);
return;
}
}
for_each_console(con) {
if (con->flags & CON_BOOT)
bootcon_enabled = true;
else
realcon_enabled = true;
}
if (console_drivers && console_drivers->flags & CON_BOOT)
bcon = console_drivers;
if (!has_preferred_console || bcon || !console_drivers)
has_preferred_console = preferred_console >= 0;
/* Do not register boot consoles when there already is a real one. */
if (newcon->flags & CON_BOOT && realcon_enabled) {
pr_info("Too late to register bootconsole %s%d\n",
newcon->name, newcon->index);
return;
}
/*
* See if we want to use this console driver. If we
* didn't select a console we take the first one
* that registers here.
* See if we want to enable this console driver by default.
*
* Nope when a console is preferred by the command line, device
* tree, or SPCR.
*
* The first real console with tty binding (driver) wins. More
* consoles might get enabled before the right one is found.
*
* Note that a console with tty binding will have CON_CONSDEV
* flag set and will be first in the list.
*/
if (!has_preferred_console) {
if (newcon->index < 0)
newcon->index = 0;
if (newcon->setup == NULL ||
newcon->setup(newcon, NULL) == 0) {
newcon->flags |= CON_ENABLED;
if (newcon->device) {
newcon->flags |= CON_CONSDEV;
has_preferred_console = true;
}
if (preferred_console < 0) {
if (!console_drivers || !console_drivers->device ||
console_drivers->flags & CON_BOOT) {
try_enable_default_console(newcon);
}
}
/* See if this console matches one we selected on the command line */
err = try_enable_new_console(newcon, true);
err = try_enable_preferred_console(newcon, true);
/* If not, try to match against the platform default(s) */
if (err == -ENOENT)
err = try_enable_new_console(newcon, false);
err = try_enable_preferred_console(newcon, false);
/* printk() messages are not printed to the Braille console. */
if (err || newcon->flags & CON_BRL)
@ -2994,8 +3004,10 @@ void register_console(struct console *newcon)
* the real console are the same physical device, it's annoying to
* see the beginning boot messages twice
*/
if (bcon && ((newcon->flags & (CON_CONSDEV | CON_BOOT)) == CON_CONSDEV))
if (bootcon_enabled &&
((newcon->flags & (CON_CONSDEV | CON_BOOT)) == CON_CONSDEV)) {
newcon->flags &= ~CON_PRINTBUFFER;
}
/*
* Put this console in the list - keep the
@ -3051,15 +3063,15 @@ void register_console(struct console *newcon)
pr_info("%sconsole [%s%d] enabled\n",
(newcon->flags & CON_BOOT) ? "boot" : "" ,
newcon->name, newcon->index);
if (bcon &&
if (bootcon_enabled &&
((newcon->flags & (CON_CONSDEV | CON_BOOT)) == CON_CONSDEV) &&
!keep_bootcon) {
/* We need to iterate through all boot consoles, to make
* sure we print everything out, before we unregister them.
*/
for_each_console(bcon)
if (bcon->flags & CON_BOOT)
unregister_console(bcon);
for_each_console(con)
if (con->flags & CON_BOOT)
unregister_console(con);
}
}
EXPORT_SYMBOL(register_console);