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| author |   Matteo Facchinetti <matteo.facchinetti@sirius-es.it> | 2013-06-12 09:21:42 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-06-17 12:49:43 -0700 |
| commit | 8a29dfb8b67fbea03e084370d93fc99cbf375535 (patch) | |
| tree | d099b48f3e5841de25770c4180a059df4323d6f9 /drivers/tty | |
| parent | serial: mfd: Add sysrq support (diff) | |
| download | linux-dev-8a29dfb8b67fbea03e084370d93fc99cbf375535.tar.xz linux-dev-8a29dfb8b67fbea03e084370d93fc99cbf375535.zip | |
serial/mpc52xx_uart: fix kernel panic when system reboot
This bug appear when a second PSC based driver appends an interrupt
routine to the FIFO controller shared interrupt (like spi-mpc512x-psc).
When reboot, uart_shutdown() remove the serial console interrupt handler
while spi-mpc512x-psc isr is still activate and cause the following kernel
panic:
The system is going down for reboot NOW!rpc (ttyPSC0) (Mon Jun 10 12:26:07 20
INIT: Sending processirq 40: nobody cared (try booting with the "irqpoll" option)
CPU: 0 PID: 0 Comm: swapper Not tainted 3.10.0-rc4-next-20130607-00001-ga0bceb3-dirty #5
Call Trace:
[cfff9f00] [c0007910] show_stack+0x48/0x150 (unreliable)
[cfff9f40] [c005ae60] __report_bad_irq.isra.6+0x34/0xe0
[cfff9f60] [c005b194] note_interrupt+0x214/0x26c
[cfff9f90] [c00590fc] handle_irq_event_percpu+0xd0/0x1bc
[cfff9fd0] [c005921c] handle_irq_event+0x34/0x54
[cfff9fe0] [c005b8f4] handle_level_irq+0x90/0xf4
[cfff9ff0] [c000cb98] call_handle_irq+0x18/0x28
[c050dd60] [c000575c] do_IRQ+0xcc/0x124
[c050dd90] [c000eb04] ret_from_except+0x0/0x14
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/mpc52xx_uart.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c index 9ba194590a80..e1280a20b7a2 100644 --- a/drivers/tty/serial/mpc52xx_uart.c +++ b/drivers/tty/serial/mpc52xx_uart.c @@ -1058,6 +1058,9 @@ mpc52xx_uart_shutdown(struct uart_port *port) if (psc_ops->clock) psc_ops->clock(port, 0); + /* Disable interrupt */ + psc_ops->cw_disable_ints(port); + /* Release interrupt */ free_irq(port->irq, port); } |