ipc: clean up ipc/shm.c
Use the macro shm_ids().
Remove useless check for a userspace pointer, because copy_to_user()
will check it.
Some style cleanups.
Signed-off-by: WANG Cong <wangcong@zeuux.org>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Cc: Pierre Peiffer <peifferp@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/ipc/shm.c b/ipc/shm.c
index 57dd500..b125b56 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -75,7 +75,7 @@
ns->shm_ctlall = SHMALL;
ns->shm_ctlmni = SHMMNI;
ns->shm_tot = 0;
- ipc_init_ids(&ns->ids[IPC_SHM_IDS]);
+ ipc_init_ids(&shm_ids(ns));
}
/*
@@ -644,7 +644,7 @@
if (err)
return err;
- memset(&shminfo,0,sizeof(shminfo));
+ memset(&shminfo, 0, sizeof(shminfo));
shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
shminfo.shmmax = ns->shm_ctlmax;
shminfo.shmall = ns->shm_ctlall;
@@ -669,7 +669,7 @@
if (err)
return err;
- memset(&shm_info,0,sizeof(shm_info));
+ memset(&shm_info, 0, sizeof(shm_info));
down_read(&shm_ids(ns).rw_mutex);
shm_info.used_ids = shm_ids(ns).in_use;
shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
@@ -678,7 +678,7 @@
shm_info.swap_successes = 0;
err = ipc_get_maxid(&shm_ids(ns));
up_read(&shm_ids(ns).rw_mutex);
- if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
+ if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
err = -EFAULT;
goto out;
}
@@ -692,11 +692,6 @@
struct shmid64_ds tbuf;
int result;
- if (!buf) {
- err = -EFAULT;
- goto out;
- }
-
if (cmd == SHM_STAT) {
shp = shm_lock(ns, shmid);
if (IS_ERR(shp)) {
@@ -712,7 +707,7 @@
}
result = 0;
}
- err=-EACCES;
+ err = -EACCES;
if (ipcperms (&shp->shm_perm, S_IRUGO))
goto out_unlock;
err = security_shm_shmctl(shp, cmd);