Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[pandora-kernel.git] / drivers / md / dm-log-userspace-transfer.c

diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 54abf9e..f1c8cae 100644 (file)
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -172,11 +172,15 @@ int dm_consult_userspace(const char *uuid, uint64_t luid, int request_type,
 {
        int r = 0;
        size_t dummy = 0;
-       int overhead_size =
-               sizeof(struct dm_ulog_request *) + sizeof(struct cn_msg);
+       int overhead_size = sizeof(struct dm_ulog_request) + sizeof(struct cn_msg);
        struct dm_ulog_request *tfr = prealloced_ulog_tfr;
        struct receiving_pkg pkg;
 
+       /*
+        * Given the space needed to hold the 'struct cn_msg' and
+        * 'struct dm_ulog_request' - do we have enough payload
+        * space remaining?
+        */
        if (data_size > (DM_ULOG_PREALLOCED_SIZE - overhead_size)) {
                DMINFO("Size of tfr exceeds preallocated size");
                return -EINVAL;
@@ -191,7 +195,7 @@ resend:
         */
        mutex_lock(&dm_ulog_lock);
 
-       memset(tfr, 0, DM_ULOG_PREALLOCED_SIZE - overhead_size);
+       memset(tfr, 0, DM_ULOG_PREALLOCED_SIZE - sizeof(struct cn_msg));
        memcpy(tfr->uuid, uuid, DM_UUID_LEN);
        tfr->luid = luid;
        tfr->seq = dm_ulog_seq++;