summaryrefslogtreecommitdiff
path: root/kernel
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2020-03-31 16:18:55 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-03-31 16:18:55 -0700
commit1f944f976d7ef8a29d1ad296253d3a9387c58e62 (patch)
tree454ef4a50ea47c054171cdde6fdc5eb767ab6d4b /kernel
parentdfabb077d62552797ca0ae7756cb30d3e195ead5 (diff)
parent8d5b305484e8a3216eeb700ed6c6de870306adbd (diff)
Merge tag 'tty-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty/serial updates from Greg KH: "Here is the big set of TTY / Serial patches for 5.7-rc1 Lots of console fixups and reworking in here, serial core tweaks (doesn't that ever get old, why are we still creating new serial devices?), serial driver updates, line-protocol driver updates, and some vt cleanups and fixes included in here as well. All have been in linux-next with no reported issues" * tag 'tty-5.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (161 commits) serial: 8250: Optimize irq enable after console write serial: 8250: Fix rs485 delay after console write vt: vt_ioctl: fix use-after-free in vt_in_use() vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console tty: serial: make SERIAL_SPRD depend on COMMON_CLK tty: serial: fsl_lpuart: fix return value checking tty: serial: fsl_lpuart: move dma_request_chan() ARM: dts: tango4: Make /serial compatible with ns16550a ARM: dts: mmp*: Make the serial ports compatible with xscale-uart ARM: dts: mmp*: Fix serial port names ARM: dts: mmp2-brownstone: Don't redeclare phandle references ARM: dts: pxa*: Make the serial ports compatible with xscale-uart ARM: dts: pxa*: Fix serial port names ARM: dts: pxa*: Don't redeclare phandle references serial: omap: drop unused dt-bindings header serial: 8250: 8250_omap: Add DMA support for UARTs on K3 SoCs serial: 8250: 8250_omap: Work around errata causing spurious IRQs with DMA serial: 8250: 8250_omap: Extend driver data to pass FIFO trigger info serial: 8250: 8250_omap: Move locking out from __dma_rx_do_complete() serial: 8250: 8250_omap: Account for data in flight during DMA teardown ...
Diffstat (limited to 'kernel')
-rw-r--r--kernel/printk/printk.c49
-rw-r--r--kernel/sysctl.c41
2 files changed, 51 insertions, 39 deletions
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index fada22dc4ab6..633f41a11d75 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1772,9 +1772,6 @@ static void call_console_drivers(const char *ext_text, size_t ext_len,
trace_console_rcuidle(text, len);
- if (!console_drivers)
- return;
-
for_each_console(con) {
if (exclusive_console && con != exclusive_console)
continue;
@@ -2653,19 +2650,17 @@ void register_console(struct console *newcon)
struct console_cmdline *c;
static bool has_preferred;
- if (console_drivers)
- for_each_console(bcon)
- if (WARN(bcon == newcon,
- "console '%s%d' already registered\n",
- bcon->name, bcon->index))
- return;
+ for_each_console(bcon) {
+ if (WARN(bcon == newcon, "console '%s%d' already registered\n",
+ bcon->name, bcon->index))
+ return;
+ }
/*
* before we register a new CON_BOOT console, make sure we don't
* already have a valid console
*/
- if (console_drivers && newcon->flags & CON_BOOT) {
- /* find the last or real 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",
@@ -2813,7 +2808,7 @@ EXPORT_SYMBOL(register_console);
int unregister_console(struct console *console)
{
- struct console *a, *b;
+ struct console *con;
int res;
pr_info("%sconsole [%s%d] disabled\n",
@@ -2821,26 +2816,30 @@ int unregister_console(struct console *console)
console->name, console->index);
res = _braille_unregister_console(console);
- if (res)
+ if (res < 0)
return res;
+ if (res > 0)
+ return 0;
- res = 1;
+ res = -ENODEV;
console_lock();
if (console_drivers == console) {
console_drivers=console->next;
res = 0;
- } else if (console_drivers) {
- for (a=console_drivers->next, b=console_drivers ;
- a; b=a, a=b->next) {
- if (a == console) {
- b->next = a->next;
+ } else {
+ for_each_console(con) {
+ if (con->next == console) {
+ con->next = console->next;
res = 0;
break;
}
}
}
- if (!res && (console->flags & CON_EXTENDED))
+ if (res)
+ goto out_disable_unlock;
+
+ if (console->flags & CON_EXTENDED)
nr_ext_console_drivers--;
/*
@@ -2853,6 +2852,16 @@ int unregister_console(struct console *console)
console->flags &= ~CON_ENABLED;
console_unlock();
console_sysfs_notify();
+
+ if (console->exit)
+ res = console->exit(console);
+
+ return res;
+
+out_disable_unlock:
+ console->flags &= ~CON_ENABLED;
+ console_unlock();
+
return res;
}
EXPORT_SYMBOL(unregister_console);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ad5b88a53c5a..94638f695e60 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -229,25 +229,8 @@ static int proc_dopipe_max_size(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos);
#ifdef CONFIG_MAGIC_SYSRQ
-/* Note: sysrq code uses its own private copy */
-static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
-
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
- void __user *buffer, size_t *lenp,
- loff_t *ppos)
-{
- int error;
-
- error = proc_dointvec(table, write, buffer, lenp, ppos);
- if (error)
- return error;
-
- if (write)
- sysrq_toggle_support(__sysrq_enabled);
-
- return 0;
-}
-
+ void __user *buffer, size_t *lenp, loff_t *ppos);
#endif
static struct ctl_table kern_table[];
@@ -747,7 +730,7 @@ static struct ctl_table kern_table[] = {
#ifdef CONFIG_MAGIC_SYSRQ
{
.procname = "sysrq",
- .data = &__sysrq_enabled,
+ .data = NULL,
.maxlen = sizeof (int),
.mode = 0644,
.proc_handler = sysrq_sysctl_handler,
@@ -2835,6 +2818,26 @@ static int proc_dostring_coredump(struct ctl_table *table, int write,
}
#endif
+#ifdef CONFIG_MAGIC_SYSRQ
+static int sysrq_sysctl_handler(struct ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int tmp, ret;
+
+ tmp = sysrq_mask();
+
+ ret = __do_proc_dointvec(&tmp, table, write, buffer,
+ lenp, ppos, NULL, NULL);
+ if (ret || !write)
+ return ret;
+
+ if (write)
+ sysrq_toggle_support(tmp);
+
+ return 0;
+}
+#endif
+
static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
void __user *buffer,
size_t *lenp, loff_t *ppos,