staging: dgnc: Need to check for NULL of ch

the "ch" from brd structure could be NULL, it need to
check for NULL.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_neo.c b/drivers/staging/dgnc/dgnc_neo.c
index 9eae1a6..ba57e95 100644 (file)
--- a/drivers/staging/dgnc/dgnc_neo.c
+++ b/drivers/staging/dgnc/dgnc_neo.c
@@ -380,7 +380,7 @@ static inline void neo_parse_isr(struct dgnc_board *brd, uint port)
        unsigned long flags;
 
        ch = brd->channels[port];
-       if (ch->magic != DGNC_CHANNEL_MAGIC)
+       if (!ch || ch->magic != DGNC_CHANNEL_MAGIC)
                return;
 
        /* Here we try to figure out what caused the interrupt to happen */