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/drivers/eisa/eisa-bus.c b/drivers/eisa/eisa-bus.c
index d944647c82c2..4d4a47393909 100644
--- a/drivers/eisa/eisa-bus.c
+++ b/drivers/eisa/eisa-bus.c
@@ -128,16 +128,11 @@ static int eisa_bus_match (struct device *dev, struct device_driver *drv)
         return 0;
 }
 
-static int eisa_bus_uevent(struct device *dev, char **envp, int num_envp,
-                           char *buffer, int buffer_size)
+static int eisa_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
 {
         struct eisa_device *edev = to_eisa_device(dev);
-        int i = 0;
-        int length = 0;
 
-        add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
-                       "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
-        envp[i] = NULL;
+        add_uevent_var(env, "MODALIAS=" EISA_DEVICE_MODALIAS_FMT, edev->id.sig);
         return 0;
 }