diff options
Diffstat (limited to 'kernel/printk/printk.c')
| -rw-r--r-- | kernel/printk/printk.c | 46 |
1 files changed, 36 insertions, 10 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 82927ca04849..06051926dfde 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -266,6 +266,7 @@ static struct console *exclusive_console; #define MAX_CMDLINECONSOLES 8 static struct console_cmdline console_cmdline[MAX_CMDLINECONSOLES]; +static int console_cmdline_cnt; static int preferred_console = -1; int console_set_on_cmdline; @@ -1902,12 +1903,25 @@ static int __add_preferred_console(char *name, int idx, char *options, * See if this tty is not yet registered, and * if we have a slot free. */ - for (i = 0, c = console_cmdline; - i < MAX_CMDLINECONSOLES && c->name[0]; - i++, c++) { + for (i = 0, c = console_cmdline; i < console_cmdline_cnt; i++, c++) { if (strcmp(c->name, name) == 0 && c->index == idx) { - if (!brl_options) - preferred_console = i; + if (brl_options) + return 0; + + /* + * Maintain an invariant that will help to find if + * the matching console is preferred, see + * register_console(): + * + * The last non-braille console is always + * the preferred one. + */ + if (i != console_cmdline_cnt - 1) + swap(console_cmdline[i], + console_cmdline[console_cmdline_cnt - 1]); + + preferred_console = console_cmdline_cnt - 1; + return 0; } } @@ -1920,6 +1934,7 @@ static int __add_preferred_console(char *name, int idx, char *options, braille_set_options(c, brl_options); c->index = idx; + console_cmdline_cnt++; return 0; } /* @@ -2459,12 +2474,23 @@ void register_console(struct console *newcon) } /* - * See if this console matches one we selected on - * the command line. + * See if this console matches one we selected on the command line. + * + * There may be several entries in the console_cmdline array matching + * with the same console, one with newcon->match(), another by + * name/index: + * + * pl011,mmio,0x87e024000000,115200 -- added from SPCR + * ttyAMA0 -- added from command line + * + * Traverse the console_cmdline array in reverse order to be + * sure that if this console is preferred then it will be the first + * matching entry. We use the invariant that is maintained in + * __add_preferred_console(). */ - for (i = 0, c = console_cmdline; - i < MAX_CMDLINECONSOLES && c->name[0]; - i++, c++) { + for (i = console_cmdline_cnt - 1; i >= 0; i--) { + c = console_cmdline + i; + if (!newcon->match || newcon->match(newcon, c->name, c->index, c->options) != 0) { /* default matching */ |