From: Julia Lawall <julia@diku.dk>
Date: Thu, 25 Dec 2008 12:39:30 +0000 (+0100)
Subject: [S390] s390: Remove redundant test
X-Git-Tag: v2.6.29-rc1~584^2~25
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=acfa922c5a00eca0abac0e2b6d6666c606c27345;p=linux-2.6-omap-h63xx.git

[S390] s390: Remove redundant test

The loop above the modified code only terminates when rc is a valid pointer.

A simplified version of the semantic patch that makes this change is as
follows: (http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
expression E;
position p1,p2;
@@

if (x@p1 == NULL || ...) { ... when forall
   return ...; }
... when != \(x=E\|x--\|x++\|--x\|++x\|x-=E\|x+=E\|x|=E\|x&=E\|&x\)
(
x@p2 == NULL
|
x@p2 != NULL
)

// another path to the test that is not through p1?
@s exists@
local idexpression r.x;
position r.p1,r.p2;
@@

... when != x@p1
(
x@p2 == NULL
|
x@p2 != NULL
)

@fix depends on !s@
position r.p1,r.p2;
expression x,E;
statement S1,S2;
@@

(
- if ((x@p2 != NULL) || ...)
  S1
|
- if ((x@p2 == NULL) && ...) S1
|
- BUG_ON(x@p2 == NULL);
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kernel/debug.c b/arch/s390/kernel/debug.c
index d80fcd4a7fe..21c90374a58 100644
--- a/arch/s390/kernel/debug.c
+++ b/arch/s390/kernel/debug.c
@@ -388,7 +388,7 @@ debug_info_copy(debug_info_t* in, int mode)
 		debug_info_free(rc);
 	} while (1);
 
-        if(!rc || (mode == NO_AREAS))
+	if (mode == NO_AREAS)
                 goto out;
 
         for(i = 0; i < in->nr_areas; i++){
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 3dc752c29c7..bacd58c5061 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2335,7 +2335,6 @@ static int qeth_init_input_buffer(struct qeth_card *card,
 	 * the QETH_IN_BUF_REQUEUE_THRESHOLD we should never run  out off
 	 * buffers
 	 */
-	BUG_ON(!pool_entry);
 
 	buf->pool_entry = pool_entry;
 	for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(card); ++i) {