From: Raul E Rangel <rrangel@chromium.org>
To: linux-input@vger.kernel.org
Cc: dmitry.torokhov@gmail.com, Shirish.S@amd.com,
Raul E Rangel <rrangel@chromium.org>,
Rajat Jain <rajatja@google.com>,
Stephen Boyd <swboyd@chromium.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/2] Input: i8042 - Lock i8042_mutex before flushing
Date: Thu, 27 Aug 2020 14:41:54 -0600 [thread overview]
Message-ID: <20200827144112.v2.2.I1417edfd3526143f14fea2546787ba4bb6f32ae8@changeid> (raw)
In-Reply-To: <20200827144112.v2.1.I6981f9a9f0c12e60f8038f3b574184f8ffc1b9b5@changeid>
Make i8042_flush lock the i8042_mutex before flushing the buffer. This
will prevent i8042_flush from clearing the buffer while a PS/2 command is
in progress. I'm not sure if this is really possible. We already
hold the lock when calling i8042_command, so this makes i8042_flush have
the same behavior.
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
---
(no changes since v1)
drivers/input/serio/i8042.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 65ca6b47f41e8..b7ed93c5095c4 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -254,6 +254,8 @@ static int i8042_flush(void)
int count = 0;
int retval = 0;
+ mutex_lock(&i8042_mutex);
+
spin_lock_irqsave(&i8042_lock, flags);
while ((str = i8042_read_status()) & I8042_STR_OBF) {
@@ -270,6 +272,8 @@ static int i8042_flush(void)
spin_unlock_irqrestore(&i8042_lock, flags);
+ mutex_unlock(&i8042_mutex);
+
return retval;
}
--
2.28.0.297.g1956fa8f8d-goog
next prev parent reply other threads:[~2020-08-27 20:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 20:41 [PATCH v2 1/2] Input: i8042 - Prevent intermixing i8042 commands Raul E Rangel
2020-08-27 20:41 ` Raul E Rangel [this message]
2020-10-28 20:35 ` Hans de Goede
2020-12-07 6:40 ` Dmitry Torokhov
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