The local variable ks0108_parport is used by other functions to write to
the parallel port. We missed initializing it when we converted the
driver to use new Parallel Port codes.
Fixes: 4edd70c133f3 ("auxdisplay: ks0108: use new parport device model")
Reported-by: Fengguang Wu <[email protected]>
Signed-off-by: Sudip Mukherjee <[email protected]>
---
Tested on kvm with the script provided by Fengguang Wu to reproduce the
error.
drivers/auxdisplay/ks0108.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
index 4c471bd..816de9e 100644
--- a/drivers/auxdisplay/ks0108.c
+++ b/drivers/auxdisplay/ks0108.c
@@ -146,6 +146,7 @@ static void ks0108_parport_attach(struct parport *port)
goto err_unreg_device;
}
+ ks0108_parport = port;
ks0108_inited = 1;
return;
@@ -167,6 +168,7 @@ static void ks0108_parport_detach(struct parport *port)
parport_release(ks0108_pardevice);
parport_unregister_device(ks0108_pardevice);
ks0108_pardevice = NULL;
+ ks0108_parport = NULL;
}
/*
--
1.9.1
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