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SubjectRe: [PATCH v2] staging: greybus: Convert timers to use timer_setup()
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On 24/10/17 15:49, 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Bryan O'Donoghue" <pure.logic@nexus-software.ie>
> Cc: Johan Hovold <johan@kernel.org>
> Cc: Alex Elder <elder@kernel.org>
> Cc: greybus-dev@lists.linaro.org
> Cc: devel@driverdev.osuosl.org
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
> v2: Added back "get" in timer code, thanks to Bryan. :)
> ---
> drivers/staging/greybus/loopback.c | 19 +++++++++----------
> drivers/staging/greybus/operation.c | 7 +++----
> 2 files changed, 12 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
> index 08e255884206..1c0bafeb7ea5 100644
> --- a/drivers/staging/greybus/loopback.c
> +++ b/drivers/staging/greybus/loopback.c
> @@ -572,16 +572,16 @@ static void gb_loopback_async_operation_work(struct work_struct *work)
> gb_loopback_async_operation_put(op_async);
> }
>
> -static void gb_loopback_async_operation_timeout(unsigned long data)
> +static void gb_loopback_async_operation_timeout(struct timer_list *t)
> {
> - struct gb_loopback_async_operation *op_async;
> - u16 id = data;
> + struct gb_loopback_async_operation *op_async =
> + from_timer(op_async, t, timer);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&gb_dev.lock, flags);
> + gb_loopback_async_operation_get(op_async);
> + spin_unlock_irqrestore(&gb_dev.lock, flags);

Damnit I'm just wrong (I hate that).

The pointer can already have gone away by the time the timer runs - my
bad...

see attached for update - with my Signed-off added.

---
bod
From aa9fbf091122c816a47de2aece5412f7fd9225a9 Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Tue, 24 Oct 2017 07:49:38 -0700
Subject: [PATCH] staging: greybus: Convert timers to use timer_setup()

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Bryan O'Donoghue" <pure.logic@nexus-software.ie>
Cc: Johan Hovold <johan@kernel.org>
Cc: Alex Elder <elder@kernel.org>
Cc: greybus-dev@lists.linaro.org
Cc: devel@driverdev.osuosl.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
---
drivers/staging/greybus/loopback.c | 38 ++++++++++++++++++++++++++-----------
drivers/staging/greybus/operation.c | 7 +++----
2 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 08e2558..81447e3 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -472,6 +472,26 @@ static void gb_loopback_async_operation_put(struct gb_loopback_async_operation
spin_unlock_irqrestore(&gb_dev.lock, flags);
}

+static struct gb_loopback_async_operation *gb_loopback_async_operation_valid(
+ struct gb_loopback_async_operation *op_async)
+{
+ struct gb_loopback_async_operation *op_async_tmp;
+ bool found = false;
+ unsigned long flags;
+
+ spin_lock_irqsave(&gb_dev.lock, flags);
+ list_for_each_entry(op_async_tmp, &gb_dev.list_op_async, entry) {
+ if (op_async_tmp == op_async) {
+ gb_loopback_async_operation_get(op_async);
+ found = true;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gb_dev.lock, flags);
+
+ return found ? op_async : NULL;
+}
+
static struct gb_loopback_async_operation *
gb_loopback_operation_find(u16 id)
{
@@ -572,17 +592,14 @@ static void gb_loopback_async_operation_work(struct work_struct *work)
gb_loopback_async_operation_put(op_async);
}

-static void gb_loopback_async_operation_timeout(unsigned long data)
+static void gb_loopback_async_operation_timeout(struct timer_list *t)
{
- struct gb_loopback_async_operation *op_async;
- u16 id = data;
+ struct gb_loopback_async_operation *op_async =
+ from_timer(op_async, t, timer);

- op_async = gb_loopback_operation_find(id);
- if (!op_async) {
- pr_err("operation %d not found - time out ?\n", id);
- return;
- }
- schedule_work(&op_async->work);
+ op_async = gb_loopback_async_operation_valid(op_async);
+ if (op_async)
+ schedule_work(&op_async->work);
}

static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
@@ -631,8 +648,7 @@ static int gb_loopback_async_operation(struct gb_loopback *gb, int type,
if (ret)
goto error;

- setup_timer(&op_async->timer, gb_loopback_async_operation_timeout,
- (unsigned long)operation->id);
+ timer_setup(&op_async->timer, gb_loopback_async_operation_timeout, 0);
op_async->timer.expires = jiffies + gb->jiffy_timeout;
add_timer(&op_async->timer);

diff --git a/drivers/staging/greybus/operation.c b/drivers/staging/greybus/operation.c
index 3023012..ee4ba3f 100644
--- a/drivers/staging/greybus/operation.c
+++ b/drivers/staging/greybus/operation.c
@@ -294,9 +294,9 @@ static void gb_operation_work(struct work_struct *work)
gb_operation_put(operation);
}

-static void gb_operation_timeout(unsigned long arg)
+static void gb_operation_timeout(struct timer_list *t)
{
- struct gb_operation *operation = (void *)arg;
+ struct gb_operation *operation = from_timer(operation, t, timer);

if (gb_operation_result_set(operation, -ETIMEDOUT)) {
/*
@@ -541,8 +541,7 @@ gb_operation_create_common(struct gb_connection *connection, u8 type,
goto err_request;
}

- setup_timer(&operation->timer, gb_operation_timeout,
- (unsigned long)operation);
+ timer_setup(&operation->timer, gb_operation_timeout, 0);
}

operation->flags = op_flags;
--
2.7.4
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