__msm_console_write() assumes that interrupts are disabled, but
with threaded console printers it is possible that the write()
callback of the console is called with interrupts enabled.
Explicitly disable interrupts using local_irq_save() to preserve
the assumed context.
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20220506213324.470461-1-john.ogness@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
static void __msm_console_write(struct uart_port *port, const char *s,
unsigned int count, bool is_uartdm)
{
+ unsigned long flags;
int i;
int num_newlines = 0;
bool replaced = false;
num_newlines++;
count += num_newlines;
+ local_irq_save(flags);
+
if (port->sysrq)
locked = 0;
else if (oops_in_progress)
if (locked)
spin_unlock(&port->lock);
+
+ local_irq_restore(flags);
}
static void msm_console_write(struct console *co, const char *s,