tty: serial: pch: don't crash if DMA enabled but not loaded

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if the DMA driver isn't loaded "on time" then we crash in the irq handler:
| pch_uart 0000:02:0a.4: pch_request_dma:dma_request_channel FAILS(Tx)
| BUG: unable to handle kernel NULL pointer dereference at   (null)
| IP: [<c0676ed9>] pch_uart_interrupt+0x739/0x940

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Sebastian Andrzej Siewior 2013-12-04 20:52:49 +01:00 • committed by Greg Kroah-Hartman

parent 0da3336f19

commit e41c098121

1 changed files with 7 additions and 3 deletions

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drivers/tty/serial/pch_uart.c

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