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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk

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Pull printk fix from Petr Mladek:
 "This reverts a fix added into 4.12-rc1. It caused the kernel log to be
  printed on another console when two consoles of the same type were
  defined, e.g. console=ttyS0 console=ttyS1.

  This configuration was never supported by kernel itself, but it
  started to make sense with systemd. In other words, the commit broke
  userspace"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk:
  Revert "printk: fix double printing with earlycon"
This commit is contained in:
Linus Torvalds 2017-06-08 10:50:04 -07:00
commit dc0cf5a77d
1 changed files with 10 additions and 36 deletions
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46
kernel/printk/printk.c
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@ -269,7 +269,6 @@ 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;
@ -1906,25 +1905,12 @@ 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 < console_cmdline_cnt; i++, c++) {
for (i = 0, c = console_cmdline;
i < MAX_CMDLINECONSOLES && c->name[0];
i++, c++) {
if (strcmp(c->name, name) == 0 && c->index == idx) {
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;
if (!brl_options)
preferred_console = i;
return 0;
}
}
@ -1937,7 +1923,6 @@ 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;
}
/*
@ -2477,23 +2462,12 @@ void register_console(struct console *newcon)
}
/*
* 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().
* See if this console matches one we selected on
* the command line.
*/
for (i = console_cmdline_cnt - 1; i >= 0; i--) {
c = console_cmdline + 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 */