treewide: init_timer() -> setup_timer()

This mechanically converts all remaining cases of ancient open-coded timer
setup with the old setup_timer() API, which is the first step in timer
conversions. This has no behavioral changes, since it ultimately just
changes the order of assignment to fields of struct timer_list when
finding variations of:

    init_timer(&t);
    f.function = timer_callback;
    t.data = timer_callback_arg;

to be converted into:

    setup_timer(&t, timer_callback, timer_callback_arg);

The conversion is done with the following Coccinelle script, which
is an improved version of scripts/cocci/api/setup_timer.cocci, in the
following ways:
 - assignments-before-init_timer() cases
 - limit the .data case removal to the specific struct timer_list instance
 - handling calls by dereference (timer->field vs timer.field)

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/setup_timer.cocci

@fix_address_of@
expression e;
@@

 init_timer(
-&(e)
+&e
 , ...)

// Match the common cases first to avoid Coccinelle parsing loops with
// "... when" clauses.

@match_immediate_function_data_after_init_timer@
expression e, func, da;
@@

-init_timer
+setup_timer
 ( \(&e\|e\)
+, func, da
 );
(
-\(e.function\|e->function\) = func;
-\(e.data\|e->data\) = da;
|
-\(e.data\|e->data\) = da;
-\(e.function\|e->function\) = func;
)

@match_immediate_function_data_before_init_timer@
expression e, func, da;
@@

(
-\(e.function\|e->function\) = func;
-\(e.data\|e->data\) = da;
|
-\(e.data\|e->data\) = da;
-\(e.function\|e->function\) = func;
)
-init_timer
+setup_timer
 ( \(&e\|e\)
+, func, da
 );

@match_function_and_data_after_init_timer@
expression e, e2, e3, e4, e5, func, da;
@@

-init_timer
+setup_timer
 ( \(&e\|e\)
+, func, da
 );
 ... when != func = e2
     when != da = e3
(
-e.function = func;
... when != da = e4
-e.data = da;
|
-e->function = func;
... when != da = e4
-e->data = da;
|
-e.data = da;
... when != func = e5
-e.function = func;
|
-e->data = da;
... when != func = e5
-e->function = func;
)

@match_function_and_data_before_init_timer@
expression e, e2, e3, e4, e5, func, da;
@@
(
-e.function = func;
... when != da = e4
-e.data = da;
|
-e->function = func;
... when != da = e4
-e->data = da;
|
-e.data = da;
... when != func = e5
-e.function = func;
|
-e->data = da;
... when != func = e5
-e->function = func;
)
... when != func = e2
    when != da = e3
-init_timer
+setup_timer
 ( \(&e\|e\)
+, func, da
 );

@r1 exists@
expression t;
identifier f;
position p;
@@

f(...) { ... when any
  init_timer@p(\(&t\|t\))
  ... when any
}

@r2 exists@
expression r1.t;
identifier g != r1.f;
expression e8;
@@

g(...) { ... when any
  \(t.data\|t->data\) = e8
  ... when any
}

// It is dangerous to use setup_timer if data field is initialized
// in another function.
@script:python depends on r2@
p << r1.p;
@@

cocci.include_match(False)

@r3@
expression r1.t, func, e7;
position r1.p;
@@

(
-init_timer@p(&t);
+setup_timer(&t, func, 0UL);
... when != func = e7
-t.function = func;
|
-t.function = func;
... when != func = e7
-init_timer@p(&t);
+setup_timer(&t, func, 0UL);
|
-init_timer@p(t);
+setup_timer(t, func, 0UL);
... when != func = e7
-t->function = func;
|
-t->function = func;
... when != func = e7
-init_timer@p(t);
+setup_timer(t, func, 0UL);
)

Signed-off-by: Kees Cook <keescook@chromium.org>

4 files changed, 12 insertions, 23 deletions

diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
index c05cb63..2effa5f 100644
--- a/drivers/nfc/pn533/pn533.c
+++ b/drivers/nfc/pn533/pn533.c
@@ -2632,9 +2632,8 @@ struct pn533 *pn533_register_device(u32 device_type,
 	if (priv->wq == NULL)
 		goto error;
 
-	init_timer(&priv->listen_timer);
-	priv->listen_timer.data = (unsigned long) priv;
-	priv->listen_timer.function = pn533_listen_mode_timer;
+	setup_timer(&priv->listen_timer, pn533_listen_mode_timer,
+		    (unsigned long)priv);
 
 	skb_queue_head_init(&priv->resp_q);
 	skb_queue_head_init(&priv->fragment_skb);
diff --git a/drivers/nfc/st-nci/ndlc.c b/drivers/nfc/st-nci/ndlc.c
index 9477994..93a7536 100644
--- a/drivers/nfc/st-nci/ndlc.c
+++ b/drivers/nfc/st-nci/ndlc.c
@@ -282,13 +282,8 @@ int ndlc_probe(void *phy_id, struct nfc_phy_ops *phy_ops, struct device *dev,
 	*ndlc_id = ndlc;
 
 	/* initialize timers */
-	init_timer(&ndlc->t1_timer);
-	ndlc->t1_timer.data = (unsigned long)ndlc;
-	ndlc->t1_timer.function = ndlc_t1_timeout;
-
-	init_timer(&ndlc->t2_timer);
-	ndlc->t2_timer.data = (unsigned long)ndlc;
-	ndlc->t2_timer.function = ndlc_t2_timeout;
+	setup_timer(&ndlc->t1_timer, ndlc_t1_timeout, (unsigned long)ndlc);
+	setup_timer(&ndlc->t2_timer, ndlc_t2_timeout, (unsigned long)ndlc);
 
 	skb_queue_head_init(&ndlc->rcv_q);
 	skb_queue_head_init(&ndlc->send_q);
diff --git a/drivers/nfc/st-nci/se.c b/drivers/nfc/st-nci/se.c
index 56f2112..bd7c1e83 100644
--- a/drivers/nfc/st-nci/se.c
+++ b/drivers/nfc/st-nci/se.c
@@ -725,15 +725,12 @@ int st_nci_se_init(struct nci_dev *ndev, struct st_nci_se_status *se_status)
 
 	init_completion(&info->se_info.req_completion);
 	/* initialize timers */
-	init_timer(&info->se_info.bwi_timer);
-	info->se_info.bwi_timer.data = (unsigned long)info;
-	info->se_info.bwi_timer.function = st_nci_se_wt_timeout;
+	setup_timer(&info->se_info.bwi_timer, st_nci_se_wt_timeout,
+		    (unsigned long)info);
 	info->se_info.bwi_active = false;
 
-	init_timer(&info->se_info.se_active_timer);
-	info->se_info.se_active_timer.data = (unsigned long)info;
-	info->se_info.se_active_timer.function =
-			st_nci_se_activation_timeout;
+	setup_timer(&info->se_info.se_active_timer,
+		    st_nci_se_activation_timeout, (unsigned long)info);
 	info->se_info.se_active = false;
 
 	info->se_info.xch_error = false;
diff --git a/drivers/nfc/st21nfca/se.c b/drivers/nfc/st21nfca/se.c
index 3a98563..b228545 100644
--- a/drivers/nfc/st21nfca/se.c
+++ b/drivers/nfc/st21nfca/se.c
@@ -392,14 +392,12 @@ void st21nfca_se_init(struct nfc_hci_dev *hdev)
 
 	init_completion(&info->se_info.req_completion);
 	/* initialize timers */
-	init_timer(&info->se_info.bwi_timer);
-	info->se_info.bwi_timer.data = (unsigned long)info;
-	info->se_info.bwi_timer.function = st21nfca_se_wt_timeout;
+	setup_timer(&info->se_info.bwi_timer, st21nfca_se_wt_timeout,
+		    (unsigned long)info);
 	info->se_info.bwi_active = false;
 
-	init_timer(&info->se_info.se_active_timer);
-	info->se_info.se_active_timer.data = (unsigned long)info;
-	info->se_info.se_active_timer.function = st21nfca_se_activation_timeout;
+	setup_timer(&info->se_info.se_active_timer,
+		    st21nfca_se_activation_timeout, (unsigned long)info);
 	info->se_info.se_active = false;
 
 	info->se_info.count_pipes = 0;