korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-27 06:04:23 +08:00
Code Issues Packages Projects Releases Wiki Activity

drivers/net: Remove redundant test

Browse Source 
In each case, ap is checked not to be NULL a few lines before.

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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Julia Lawall 2008-12-25 18:03:28 -08:00 committed by David S. Miller
parent 662f44af63
commit 90f5dfcc6a
2 changed files with 0 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/ppp_async.c
View File

@ -293,9 +293,6 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
err = -EFAULT;
switch (cmd) {
case PPPIOCGCHAN:
err = -ENXIO;
if (!ap)
break;
err = -EFAULT;
if (put_user(ppp_channel_index(&ap->chan), p))
break;
@ -303,9 +300,6 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
break;
case PPPIOCGUNIT:
err = -ENXIO;
if (!ap)
break;
err = -EFAULT;
if (put_user(ppp_unit_number(&ap->chan), p))
break;

6
drivers/net/ppp_synctty.c
View File

@ -333,9 +333,6 @@ ppp_synctty_ioctl(struct tty_struct *tty, struct file *file,
err = -EFAULT;
switch (cmd) {
case PPPIOCGCHAN:
err = -ENXIO;
if (!ap)
break;
err = -EFAULT;
if (put_user(ppp_channel_index(&ap->chan), p))
break;
@ -343,9 +340,6 @@ ppp_synctty_ioctl(struct tty_struct *tty, struct file *file,
break;
case PPPIOCGUNIT:
err = -ENXIO;
if (!ap)
break;
err = -EFAULT;
if (put_user(ppp_unit_number(&ap->chan), p))
break;