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printk: Move console matching logic into a separate function 

This moves the loop that tries to match a newly registered console
with the command line or add_preferred_console list into a separate
helper, in order to be able to call it multiple times in subsequent
patches.

Link: https://lore.kernel.org/r/20200213095133.23176-2-pmladek@suse.com
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Benjamin Herrenschmidt 2020-02-13 10:51:31 +01:00 committed by Petr Mladek
parent a4fe2b4d87
commit ad8cd1db80
1 changed files with 65 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
kernel/printk/printk.c
View File

@ -280,6 +280,7 @@ 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);
@ -2626,6 +2627,60 @@ static int __init keep_bootcon_setup(char *str)
early_param("keep_bootcon", keep_bootcon_setup);
/*
* This is called by register_console() to try to match
* the newly registered console with any of the ones selected
* by either the command line or add_preferred_console() and
* setup/enable it.
*
* Care need to be taken with consoles that are statically
* enabled such as netconsole
*/
static int try_enable_new_console(struct console *newcon)
{
struct console_cmdline *c;
int i;
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
i++, c++) {
if (!newcon->match ||
newcon->match(newcon, c->name, c->index, c->options) != 0) {
/* default matching */
BUILD_BUG_ON(sizeof(c->name) != sizeof(newcon->name));
if (strcmp(c->name, newcon->name) != 0)
continue;
if (newcon->index >= 0 &&
newcon->index != c->index)
continue;
if (newcon->index < 0)
newcon->index = c->index;
if (_braille_register_console(newcon, c))
return 0;
if (newcon->setup &&
newcon->setup(newcon, c->options) != 0)
return -EIO;
}
newcon->flags |= CON_ENABLED;
if (i == preferred_console) {
newcon->flags |= CON_CONSDEV;
has_preferred_console = true;
}
return 0;
}
/*
* Some consoles, such as pstore and netconsole, can be enabled even
* without matching.
*/
if (newcon->flags & CON_ENABLED)
return 0;
return -ENOENT;
}
/*
* The console driver calls this routine during kernel initialization
* to register the console printing procedure with printk() and to
@ -2647,11 +2702,9 @@ early_param("keep_bootcon", keep_bootcon_setup);
*/
void register_console(struct console *newcon)
{
int i;
unsigned long flags;
struct console *bcon = NULL;
struct console_cmdline *c;
static bool has_preferred;
int err;
if (console_drivers)
for_each_console(bcon)
@ -2678,15 +2731,15 @@ void register_console(struct console *newcon)
if (console_drivers && console_drivers->flags & CON_BOOT)
bcon = console_drivers;
if (!has_preferred || bcon || !console_drivers)
has_preferred = preferred_console >= 0;
if (!has_preferred_console || bcon || !console_drivers)
has_preferred_console = preferred_console >= 0;
/*
* See if we want to use this console driver. If we
* didn't select a console we take the first one
* that registers here.
*/
if (!has_preferred) {
if (!has_preferred_console) {
if (newcon->index < 0)
newcon->index = 0;
if (newcon->setup == NULL ||
@ -2694,47 +2747,19 @@ void register_console(struct console *newcon)
newcon->flags |= CON_ENABLED;
if (newcon->device) {
newcon->flags |= CON_CONSDEV;
has_preferred = true;
has_preferred_console = true;
}
}
}
/*
* See if this console matches one we selected on
* the command line.
* See if this console matches one we selected on
* the command line or if it was statically enabled
*/
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
i++, c++) {
if (!newcon->match ||
newcon->match(newcon, c->name, c->index, c->options) != 0) {
/* default matching */
BUILD_BUG_ON(sizeof(c->name) != sizeof(newcon->name));
if (strcmp(c->name, newcon->name) != 0)
continue;
if (newcon->index >= 0 &&
newcon->index != c->index)
continue;
if (newcon->index < 0)
newcon->index = c->index;
err = try_enable_new_console(newcon);
if (_braille_register_console(newcon, c))
return;
if (newcon->setup &&
newcon->setup(newcon, c->options) != 0)
break;
}
newcon->flags |= CON_ENABLED;
if (i == preferred_console) {
newcon->flags |= CON_CONSDEV;
has_preferred = true;
}
break;
}
if (!(newcon->flags & CON_ENABLED))
/* printk() messages are not printed to the Braille console. */
if (err || newcon->flags & CON_BRL)
return;
/*