From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: linux-input@vger.kernel.org
Cc: Thomas Tuttle <ttuttle@chromium.org>
Subject: [PATCH 3/9] Input: serio_raw - perform proper locking when adding clients to list
Date: Wed, 5 Oct 2011 22:08:10 -0700 [thread overview]
Message-ID: <1317877696-7719-3-git-send-email-dmitry.torokhov@gmail.com> (raw)
In-Reply-To: <1317877696-7719-1-git-send-email-dmitry.torokhov@gmail.com>
Make sure we hold serio lock when adding clients to client list so that
we do not race with serio_raw_release() removing clients from the same
list.
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
drivers/input/serio/serio_raw.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index 6b57ee3..77ce3a6 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -106,7 +106,10 @@ static int serio_raw_open(struct inode *inode, struct file *file)
file->private_data = client;
kref_get(&serio_raw->kref);
+
+ serio_pause_rx(serio_raw->serio);
list_add_tail(&client->node, &serio_raw->client_list);
+ serio_continue_rx(serio_raw->serio);
out:
mutex_unlock(&serio_raw_mutex);
@@ -138,10 +141,9 @@ static int serio_raw_release(struct inode *inode, struct file *file)
static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)
{
- unsigned long flags;
int empty;
- spin_lock_irqsave(&serio_raw->serio->lock, flags);
+ serio_pause_rx(serio_raw->serio);
empty = serio_raw->head == serio_raw->tail;
if (!empty) {
@@ -149,7 +151,7 @@ static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)
serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;
}
- spin_unlock_irqrestore(&serio_raw->serio->lock, flags);
+ serio_continue_rx(serio_raw->serio);
return !empty;
}
--
1.7.6.4
next prev parent reply other threads:[~2011-10-06 5:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-06 5:08 [PATCH 1/9] Input: serio-raw - use kref instead of rolling out its own refcounting Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 2/9] Input: serio_raw - rename serio_raw_list to serio_raw_client Dmitry Torokhov
2011-10-06 5:08 ` Dmitry Torokhov [this message]
2011-10-06 5:08 ` [PATCH 4/9] Input: serio_raw - use bool for boolean data Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 5/9] Input: serio_raw - use dev_*() for messages Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 6/9] Input: serio_raw - fix coding style issues Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 7/9] Input: serio_raw - explicitly mark disconnected ports as dead Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 8/9] Input: serio_raw - kick clients when disconnecting port Dmitry Torokhov
2011-10-06 5:08 ` [PATCH 9/9] Input: serio_raw - fix memory leak when closing char device Dmitry Torokhov
2011-10-06 6:05 ` [PATCH 1/9] Input: serio-raw - use kref instead of rolling out its own refcounting Wanlong Gao
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