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7fd6f640f2
Trying to write console output from within the serial console driver
while the port->lock is held causes recursive deadlock:
CPU 0
spin_lock_irqsave(&port->lock)
printk()
console_unlock()
call_console_drivers()
serial8250_console_write()
spin_lock_irqsave(&port->lock)
** DEADLOCK **
The 8250_dw i/o accessors try to write a console error message if the
LCR workaround was unsuccessful. When the port->lock is already held
(eg., when called from serial8250_set_termios()), this deadlocks.
Make the error message a FIXME until a general solution is devised.
Cc: Tim Kryger <tim.kryger@gmail.com>
Reported-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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|---|---|---|
| .. | ||
| 8250_accent.c | ||
| 8250_acorn.c | ||
| 8250_boca.c | ||
| 8250_core.c | ||
| 8250_dma.c | ||
| 8250_dw.c | ||
| 8250_early.c | ||
| 8250_em.c | ||
| 8250_exar_st16c554.c | ||
| 8250_fintek.c | ||
| 8250_fourport.c | ||
| 8250_fsl.c | ||
| 8250_gsc.c | ||
| 8250_hp300.c | ||
| 8250_hub6.c | ||
| 8250_mtk.c | ||
| 8250_omap.c | ||
| 8250_pci.c | ||
| 8250_pnp.c | ||
| 8250.h | ||
| Kconfig | ||
| Makefile | ||
| serial_cs.c | ||