linux-kernel - [158/205] isdn/capi: make reset

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Date:	Fri, 30 Jul 2010 10:52:55 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Tilman Schmidt <tilman@...p.cc>,
	Karsten Keil <isdn@...ux-pingi.de>,
	"David S. Miller" <davem@...emloft.net>
Subject: [158/205] isdn/capi: make reset_ctr op truly optional

2.6.34-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Tilman Schmidt <tilman@...p.cc>

commit 85a83560afa69862639fb2d6f670b4440a003335 upstream.

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 <tilman@...p.cc>
Acked-by: Karsten Keil <isdn@...ux-pingi.de>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/isdn/capi/kcapi.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- 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);


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