omap_device infrastructure has a suspend_noirq hook which
runtime suspends all devices late in the suspend cycle (see
_od_suspend_noirq() in arch/arm/mach-omap2/omap_device.c)
This leads to a NULL pointer exception in 8250_omap driver
since by the time omap8250_runtime_suspend() is called, 8250_dma
driver has already set rxchan to NULL via serial8250_release_dma().
Make an explicit check to see if rxchan is NULL in
runtime_{suspend|resume} hooks to fix this.
Signed-off-by: Sekhar Nori <nsekhar@xxxxxx>
---
Previous version: http://www.spinics.net/lists/linux-omap/msg119459.html
No change in this version except rebased to v4.2-rc1
drivers/tty/serial/8250/8250_omap.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c
index d75a66c72750..20c5b9c4c288 100644
--- a/drivers/tty/serial/8250/8250_omap.c
+++ b/drivers/tty/serial/8250/8250_omap.c
@@ -1285,7 +1285,7 @@ static int omap8250_runtime_suspend(struct device *dev)
return -EBUSY;
}
- if (up->dma)
+ if (up->dma && up->dma->rxchan)
omap_8250_rx_dma(up, UART_IIR_RX_TIMEOUT);
priv->latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
@@ -1310,7 +1310,7 @@ static int omap8250_runtime_resume(struct device *dev)
if (loss_cntx)
omap8250_restore_regs(up);
- if (up->dma)
+ if (up->dma && up->dma->rxchan)
omap_8250_rx_dma(up, 0);
priv->latency = priv->calc_latency;
--
2.4.4.408.g16da57c
--
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