Driver core: change add_uevent_var to use a struct

This changes the uevent buffer functions to use a struct instead of a
long list of parameters. It does no longer require the caller to do the
proper buffer termination and size accounting, which is currently wrong
in some places. It fixes a known bug where parts of the uevent
environment are overwritten because of wrong index calculations.

Many thanks to Mathieu Desnoyers for finding bugs and improving the
error handling.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 7 deletions

diff --git a/arch/powerpc/platforms/ps3/system-bus.c b/arch/powerpc/platforms/ps3/system-bus.c
index 4bb634a17e43..ea0b2c790412 100644
--- a/arch/powerpc/platforms/ps3/system-bus.c
+++ b/arch/powerpc/platforms/ps3/system-bus.c
@@ -437,18 +437,13 @@ static void ps3_system_bus_shutdown(struct device *_dev)
         dev_dbg(&dev->core, " <- %s:%d\n", __func__, __LINE__);
 }
 
-static int ps3_system_bus_uevent(struct device *_dev, char **envp,
-                                 int num_envp, char *buffer, int buffer_size)
+static int ps3_system_bus_uevent(struct device *_dev, struct kobj_uevent_env *env)
 {
         struct ps3_system_bus_device *dev = ps3_dev_to_system_bus_dev(_dev);
         int i = 0, length = 0;
 
-        if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
-                           &length, "MODALIAS=ps3:%d",
-                           dev->match_id))
+        if (add_uevent_var(env, "MODALIAS=ps3:%d", dev->match_id))
                 return -ENOMEM;
-
-        envp[i] = NULL;
         return 0;
 }