From 85a83560afa69862639fb2d6f670b4440a003335 Mon Sep 17 00:00:00 2001 From: Tilman Schmidt Date: Sun, 23 May 2010 01:02:08 +0000 Subject: [PATCH] isdn/capi: make reset_ctr op truly optional The CAPI controller operation reset_ctr is marked as optional, and not all drivers do implement it. Add a check to the kernel CAPI whether it exists before trying to call it. Signed-off-by: Tilman Schmidt Acked-by: Karsten Keil Signed-off-by: David S. Miller --- drivers/isdn/capi/kcapi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c index bd00dceacaf..bde3c88b8b2 100644 --- a/drivers/isdn/capi/kcapi.c +++ b/drivers/isdn/capi/kcapi.c @@ -1147,6 +1147,12 @@ load_unlock_out: if (ctr->state == CAPI_CTR_DETECTED) goto reset_unlock_out; + if (ctr->reset_ctr == NULL) { + printk(KERN_DEBUG "kcapi: reset: no reset function\n"); + retval = -ESRCH; + goto reset_unlock_out; + } + ctr->reset_ctr(ctr); retval = wait_on_ctr_state(ctr, CAPI_CTR_DETECTED);