uevent: use add_uevent_var() instead of open coding it

Make use of add_uevent_var() instead of (often incorrectly) open coding it.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Eric Rannaud <eric.rannaud@gmail.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 13 insertions, 15 deletions

diff --git a/drivers/s390/crypto/ap_bus.c b/drivers/s390/crypto/ap_bus.c
index bf37cdf43fae..5aac0ec36368 100644
--- a/drivers/s390/crypto/ap_bus.c
+++ b/drivers/s390/crypto/ap_bus.c
@@ -423,27 +423,25 @@ static int ap_uevent (struct device *dev, char **envp, int num_envp,
                        char *buffer, int buffer_size)
 {
         struct ap_device *ap_dev = to_ap_dev(dev);
-        int length;
+        int retval = 0, length = 0, i = 0;
 
         if (!ap_dev)
                 return -ENODEV;
 
         /* Set up DEV_TYPE environment variable. */
-        envp[0] = buffer;
-        length = scnprintf(buffer, buffer_size, "DEV_TYPE=%04X",
-                           ap_dev->device_type);
-        if (buffer_size - length <= 0)
-                return -ENOMEM;
-        buffer += length;
-        buffer_size -= length;
+        retval = add_uevent_var(envp, num_envp, &i,
+                                buffer, buffer_size, &length,
+                                "DEV_TYPE=%04X", ap_dev->device_type);
+        if (retval)
+                return retval;
+
         /* Add MODALIAS= */
-        envp[1] = buffer;
-        length = scnprintf(buffer, buffer_size, "MODALIAS=ap:t%02X",
-                           ap_dev->device_type);
-        if (buffer_size - length <= 0)
-                return -ENOMEM;
-        envp[2] = NULL;
-        return 0;
+        retval = add_uevent_var(envp, num_envp, &i,
+                                buffer, buffer_size, &length,
+                                "MODALIAS=ap:t%02X", ap_dev->device_type);
+
+        envp[i] = NULL;
+        return retval;
 }
 
 static struct bus_type ap_bus_type = {