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drivers/isdn: Drop unnecessary NULL test

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The result of container_of should not be NULL.  In particular, in this case
the argument to the enclosing function has passed though INIT_WORK, which
dereferences it, implying that its container cannot be NULL.

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

// <smpl>
@@
identifier fn,work,x,fld;
type T;
expression E1,E2;
statement S;
@@

static fn(struct work_struct *work) {
  ... when != work = E1
  x = container_of(work,T,fld)
  ... when != x = E2
- if (x == NULL) S
  ...
}
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Karsten Keil <keil@b1-systems.de>
This commit is contained in:
Julia Lawall 2009-07-12 22:05:03 +02:00 committed by Karsten Keil
parent a900845e56
commit 3cad3da3ed
6 changed files with 0 additions and 12 deletions
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2
drivers/isdn/hisax/amd7930_fn.c
View file

@ -238,8 +238,6 @@ Amd7930_bh(struct work_struct *work)
container_of(work, struct IsdnCardState, tqueue);
struct PStack *stptr;
if (!cs)
return;
if (test_and_clear_bit(D_CLEARBUSY, &cs->event)) {
if (cs->debug)
debugl1(cs, "Amd7930: bh, D-Channel Busy cleared");

2
drivers/isdn/hisax/hfc_pci.c
View file

@ -1506,8 +1506,6 @@ hfcpci_bh(struct work_struct *work)
u_long flags;
// struct PStack *stptr;
if (!cs)
return;
if (test_and_clear_bit(D_L1STATECHANGE, &cs->event)) {
if (!cs->hw.hfcpci.nt_mode)
switch (cs->dc.hfcpci.ph_state) {

2
drivers/isdn/hisax/hfc_sx.c
View file

@ -1255,8 +1255,6 @@ hfcsx_bh(struct work_struct *work)
container_of(work, struct IsdnCardState, tqueue);
u_long flags;
if (!cs)
return;
if (test_and_clear_bit(D_L1STATECHANGE, &cs->event)) {
if (!cs->hw.hfcsx.nt_mode)
switch (cs->dc.hfcsx.ph_state) {

2
drivers/isdn/hisax/icc.c
View file

@ -83,8 +83,6 @@ icc_bh(struct work_struct *work)
container_of(work, struct IsdnCardState, tqueue);
struct PStack *stptr;
if (!cs)
return;
if (test_and_clear_bit(D_CLEARBUSY, &cs->event)) {
if (cs->debug)
debugl1(cs, "D-Channel Busy cleared");

2
drivers/isdn/hisax/isac.c
View file

@ -86,8 +86,6 @@ isac_bh(struct work_struct *work)
container_of(work, struct IsdnCardState, tqueue);
struct PStack *stptr;
if (!cs)
return;
if (test_and_clear_bit(D_CLEARBUSY, &cs->event)) {
if (cs->debug)
debugl1(cs, "D-Channel Busy cleared");

2
drivers/isdn/hisax/w6692.c
View file

@ -105,8 +105,6 @@ W6692_bh(struct work_struct *work)
container_of(work, struct IsdnCardState, tqueue);
struct PStack *stptr;
if (!cs)
return;
if (test_and_clear_bit(D_CLEARBUSY, &cs->event)) {
if (cs->debug)
debugl1(cs, "D-Channel Busy cleared");