From 2891d4feae7c2cf0a56d84bf38519aae6c5060b5 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 26 Apr 2018 10:29:57 +0200 Subject: [PATCH] Revert "ARM: amba: Fix race condition with driver_override" This reverts commit 6b614a87f3f477571e319281e84dba11e0ea0a76. My backport was incorrect, as Geert pointed out :( Reported-by: Geert Uytterhoeven Cc: Todd Kjos Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/amba/bus.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index 8e6ac3031662..fac8e36de11e 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -69,15 +69,11 @@ static ssize_t driver_override_show(struct device *_dev, struct device_attribute *attr, char *buf) { struct amba_device *dev = to_amba_device(_dev); - ssize_t len; if (!dev->driver_override) return 0; - device_lock(_dev); - len = sprintf(buf, "%s\n", dev->driver_override); - device_unlock(_dev); - return len; + return sprintf(buf, "%s\n", dev->driver_override); } static ssize_t driver_override_store(struct device *_dev, @@ -85,7 +81,7 @@ static ssize_t driver_override_store(struct device *_dev, const char *buf, size_t count) { struct amba_device *dev = to_amba_device(_dev); - char *driver_override, *old, *cp; + char *driver_override, *old = dev->driver_override, *cp; /* We need to keep extra room for a newline */ if (count >= (PAGE_SIZE - 1)) @@ -99,15 +95,12 @@ static ssize_t driver_override_store(struct device *_dev, if (cp) *cp = '\0'; - device_lock(_dev); - old = dev->driver_override; if (strlen(driver_override)) { dev->driver_override = driver_override; } else { kfree(driver_override); dev->driver_override = NULL; } - device_unlock(_dev); kfree(old); -- 2.30.2