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Date: Fri, 2 Mar 2018 18:29:19 -0300
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: "David S. Miller" <davem@...emloft.net>,
Samuel Ortiz <samuel@...tiz.org>,
Stephen Hemminger <stephen@...workplumber.org>,
Johannes Berg <johannes.berg@...el.com>,
Ingo Molnar <mingo@...nel.org>, netdev@...r.kernel.org,
Thomas Gleixner <tglx@...utronix.de>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/58] net/irda: Convert timers to use timer_setup()
On Mon, Oct 16, 2017 at 05:28:53PM -0700, Kees Cook wrote:
> In preparation for unconditionally passing the struct timer_list pointer to
> all timer callbacks, switch to using the new timer_setup() and from_timer()
> to pass the timer pointer explicitly.
>
> Cc: Samuel Ortiz <samuel@...tiz.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Stephen Hemminger <stephen@...workplumber.org>
> Cc: Johannes Berg <johannes.berg@...el.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> .../staging/irda/include/net/irda/irlmp_event.h | 6 +--
> drivers/staging/irda/include/net/irda/timer.h | 11 ++---
> drivers/staging/irda/net/af_irda.c | 7 ++-
> drivers/staging/irda/net/ircomm/ircomm_tty.c | 2 +-
> .../staging/irda/net/ircomm/ircomm_tty_attach.c | 8 ++--
> drivers/staging/irda/net/irda_device.c | 10 ++--
> drivers/staging/irda/net/iriap.c | 10 ++--
> drivers/staging/irda/net/irlan/irlan_client.c | 6 +--
> drivers/staging/irda/net/irlan/irlan_common.c | 4 +-
> drivers/staging/irda/net/irlap.c | 16 +++----
> drivers/staging/irda/net/irlap_event.c | 6 +--
> drivers/staging/irda/net/irlmp.c | 8 ++--
> drivers/staging/irda/net/irlmp_event.c | 10 ++--
> drivers/staging/irda/net/irttp.c | 11 ++---
> drivers/staging/irda/net/timer.c | 54 +++++++++++-----------
> 15 files changed, 79 insertions(+), 90 deletions(-)
>
> diff --git a/drivers/staging/irda/include/net/irda/irlmp_event.h b/drivers/staging/irda/include/net/irda/irlmp_event.h
> index 9e4ec17a7449..a1a082fe384e 100644
> --- a/drivers/staging/irda/include/net/irda/irlmp_event.h
> +++ b/drivers/staging/irda/include/net/irda/irlmp_event.h
> @@ -82,9 +82,9 @@ typedef enum {
> extern const char *const irlmp_state[];
> extern const char *const irlsap_state[];
>
> -void irlmp_watchdog_timer_expired(void *data);
> -void irlmp_discovery_timer_expired(void *data);
> -void irlmp_idle_timer_expired(void *data);
> +void irlmp_watchdog_timer_expired(struct timer_list *t);
> +void irlmp_discovery_timer_expired(struct timer_list *t);
> +void irlmp_idle_timer_expired(struct timer_list *t);
>
> void irlmp_do_lap_event(struct lap_cb *self, IRLMP_EVENT event,
> struct sk_buff *skb);
> diff --git a/drivers/staging/irda/include/net/irda/timer.h b/drivers/staging/irda/include/net/irda/timer.h
> index d784f242cf7b..a6635f0afae9 100644
> --- a/drivers/staging/irda/include/net/irda/timer.h
> +++ b/drivers/staging/irda/include/net/irda/timer.h
> @@ -72,14 +72,11 @@ struct lap_cb;
>
> #define WATCHDOG_TIMEOUT (20*HZ) /* 20 sec */
>
> -typedef void (*TIMER_CALLBACK)(void *);
> -
> -static inline void irda_start_timer(struct timer_list *ptimer, int timeout,
> - void* data, TIMER_CALLBACK callback)
> +static inline void irda_start_timer(struct timer_list *ptimer, int timeout,
> + void (*callback)(struct timer_list *))
> {
> - ptimer->function = (void (*)(unsigned long)) callback;
> - ptimer->data = (unsigned long) data;
> -
> + ptimer->function = (TIMER_FUNC_TYPE) callback;
> +
> /* Set new value for timer (update or add timer).
> * We use mod_timer() because it's more efficient and also
> * safer with respect to race conditions - Jean II */
> diff --git a/drivers/staging/irda/net/af_irda.c b/drivers/staging/irda/net/af_irda.c
> index 23fa7c8b09a5..b82a47b9ef0b 100644
> --- a/drivers/staging/irda/net/af_irda.c
> +++ b/drivers/staging/irda/net/af_irda.c
> @@ -429,11 +429,11 @@ static void irda_selective_discovery_indication(discinfo_t *discovery,
> * We were waiting for a node to be discovered, but nothing has come up
> * so far. Wake up the user and tell him that we failed...
> */
> -static void irda_discovery_timeout(u_long priv)
> +static void irda_discovery_timeout(struct timer_list *t)
> {
> struct irda_sock *self;
>
> - self = (struct irda_sock *) priv;
> + self = from_timer(self, t, watchdog);
> BUG_ON(self == NULL);
>
> /* Nothing for the caller */
> @@ -2505,8 +2505,7 @@ static int irda_getsockopt(struct socket *sock, int level, int optname,
>
> /* Set watchdog timer to expire in <val> ms. */
> self->errno = 0;
> - setup_timer(&self->watchdog, irda_discovery_timeout,
> - (unsigned long)self);
> + timer_setup(&self->watchdog, irda_discovery_timeout, 0);
> mod_timer(&self->watchdog,
> jiffies + msecs_to_jiffies(val));
>
> diff --git a/drivers/staging/irda/net/ircomm/ircomm_tty.c b/drivers/staging/irda/net/ircomm/ircomm_tty.c
> index ec157c3419b5..473abfaffe7b 100644
> --- a/drivers/staging/irda/net/ircomm/ircomm_tty.c
> +++ b/drivers/staging/irda/net/ircomm/ircomm_tty.c
> @@ -395,7 +395,7 @@ static int ircomm_tty_install(struct tty_driver *driver, struct tty_struct *tty)
> self->max_data_size = IRCOMM_TTY_DATA_UNINITIALISED;
>
> /* Init some important stuff */
> - init_timer(&self->watchdog_timer);
> + timer_setup(&self->watchdog_timer, NULL, 0);
> spin_lock_init(&self->spinlock);
>
> /*
> diff --git a/drivers/staging/irda/net/ircomm/ircomm_tty_attach.c b/drivers/staging/irda/net/ircomm/ircomm_tty_attach.c
> index 0a411019c098..e2d5ce8ba0db 100644
> --- a/drivers/staging/irda/net/ircomm/ircomm_tty_attach.c
> +++ b/drivers/staging/irda/net/ircomm/ircomm_tty_attach.c
> @@ -52,7 +52,7 @@ static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
> struct ias_value *value, void *priv);
> static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
> int timeout);
> -static void ircomm_tty_watchdog_timer_expired(void *data);
> +static void ircomm_tty_watchdog_timer_expired(struct timer_list *timer);
>
> static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
> IRCOMM_TTY_EVENT event,
> @@ -587,7 +587,7 @@ static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
> IRDA_ASSERT(self != NULL, return;);
> IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
>
> - irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
> + irda_start_timer(&self->watchdog_timer, timeout,
> ircomm_tty_watchdog_timer_expired);
> }
>
> @@ -597,9 +597,9 @@ static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
> * Called when the connect procedure have taken to much time.
> *
> */
> -static void ircomm_tty_watchdog_timer_expired(void *data)
> +static void ircomm_tty_watchdog_timer_expired(struct timer_list *t)
> {
> - struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
> + struct ircomm_tty_cb *self = from_timer(self, t, watchdog_timer);
>
> IRDA_ASSERT(self != NULL, return;);
> IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
> diff --git a/drivers/staging/irda/net/irda_device.c b/drivers/staging/irda/net/irda_device.c
> index d33de8a8762a..682b4eea15e0 100644
> --- a/drivers/staging/irda/net/irda_device.c
> +++ b/drivers/staging/irda/net/irda_device.c
> @@ -57,7 +57,7 @@ static void __irda_task_delete(struct irda_task *task);
> static hashbin_t *dongles;
> static hashbin_t *tasks;
>
> -static void irda_task_timer_expired(void *data);
> +static void irda_task_timer_expired(struct timer_list *timer);
>
> int __init irda_device_init(void)
> {
> @@ -233,7 +233,7 @@ static int irda_task_kick(struct irda_task *task)
> }
> irda_task_delete(task);
> } else if (timeout > 0) {
> - irda_start_timer(&task->timer, timeout, (void *)task,
> + irda_start_timer(&task->timer, timeout,
> irda_task_timer_expired);
> finished = FALSE;
> } else {
> @@ -251,11 +251,9 @@ static int irda_task_kick(struct irda_task *task)
> * Task time has expired. We now try to execute task (again), and restart
> * the timer if the task has not finished yet
> */
> -static void irda_task_timer_expired(void *data)
> +static void irda_task_timer_expired(struct timer_list *t)
> {
> - struct irda_task *task;
> -
> - task = data;
> + struct irda_task *task = from_timer(task, t, timer);
>
> irda_task_kick(task);
> }
> diff --git a/drivers/staging/irda/net/iriap.c b/drivers/staging/irda/net/iriap.c
> index 1138eaf5c682..d64192e9db8b 100644
> --- a/drivers/staging/irda/net/iriap.c
> +++ b/drivers/staging/irda/net/iriap.c
> @@ -76,12 +76,12 @@ static void iriap_connect_confirm(void *instance, void *sap,
> static int iriap_data_indication(void *instance, void *sap,
> struct sk_buff *skb);
>
> -static void iriap_watchdog_timer_expired(void *data);
> +static void iriap_watchdog_timer_expired(struct timer_list *t);
>
> static inline void iriap_start_watchdog_timer(struct iriap_cb *self,
> int timeout)
> {
> - irda_start_timer(&self->watchdog_timer, timeout, self,
> + irda_start_timer(&self->watchdog_timer, timeout,
> iriap_watchdog_timer_expired);
I'm having build issues on current net-next:
CC [M] drivers/staging/irda/net/iriap.o
In file included from /home/mleitner/linux/include/net/irda/iriap.h:35:0,
from /home/mleitner/linux/drivers/staging/irda/net/iriap.c:44:
/home/mleitner/linux/include/net/irda/timer.h: In function ‘irda_start_timer’:
/home/mleitner/linux/include/net/irda/timer.h:80:19: error: assignment from incompatible pointer type [-Werror=incompatible-pointer-types]
ptimer->function = (void (*)(unsigned long)) callback;
^
/home/mleitner/linux/include/net/irda/timer.h:81:8: error: ‘struct timer_list’ has no member named ‘data’
ptimer->data = (unsigned long) data;
^~
/home/mleitner/linux/drivers/staging/irda/net/iriap.c: In function ‘iriap_start_watchdog_timer’:
/home/mleitner/linux/drivers/staging/irda/net/iriap.c:84:2: error: too few arguments to function ‘irda_start_timer’
irda_start_timer(&self->watchdog_timer, timeout,
^~~~~~~~~~~~~~~~
In file included from /home/mleitner/linux/include/net/irda/iriap.h:35:0,
from /home/mleitner/linux/drivers/staging/irda/net/iriap.c:44:
/home/mleitner/linux/include/net/irda/timer.h:77:20: note: declared here
static inline void irda_start_timer(struct timer_list *ptimer, int timeout,
^~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
Note how it is using the irda_start_timer definition from
include/net/irda/timer.h instead of
drivers/staging/irda/include/net/irda/timer.h which was patched in
this patch.
Marcelo
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