Update from upstream with manual merge of Yasunori Goto's

changes to swiotlb.c made in commit 281dd25cdc0d6903929b79183816d151ea626341
since this file has been moved from arch/ia64/lib/swiotlb.c to
lib/swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 23 insertions, 18 deletions

diff --git a/arch/um/kernel/umid.c b/arch/um/kernel/umid.c
index 186c28885016..0b21d59ba0cd 100644
--- a/arch/um/kernel/umid.c
+++ b/arch/um/kernel/umid.c
@@ -31,6 +31,8 @@ static char *uml_dir = UML_DIR;
 /* Changed by set_umid */
 static int umid_is_random = 1;
 static int umid_inited = 0;
+/* Have we created the files? Should we remove them? */
+static int umid_owned = 0;
 
 static int make_umid(int (*printer)(const char *fmt, ...));
 
@@ -82,20 +84,21 @@ int __init umid_file_name(char *name, char *buf, int len)
 
 extern int tracing_pid;
 
-static int __init create_pid_file(void)
+static void __init create_pid_file(void)
 {
         char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
         char pid[sizeof("nnnnn\0")];
         int fd, n;
 
-        if(umid_file_name("pid", file, sizeof(file))) return 0;
+        if(umid_file_name("pid", file, sizeof(file)))
+                return;
 
         fd = os_open_file(file, of_create(of_excl(of_rdwr(OPENFLAGS()))), 
                           0644);
         if(fd < 0){
                 printf("Open of machine pid file \"%s\" failed: %s\n",
                        file, strerror(-fd));
-                return 0;
+                return;
         }
 
         sprintf(pid, "%d\n", os_getpid());
@@ -103,7 +106,6 @@ static int __init create_pid_file(void)
         if(n != strlen(pid))
                 printf("Write of pid file failed - err = %d\n", -n);
         os_close_file(fd);
-        return 0;
 }
 
 static int actually_do_remove(char *dir)
@@ -147,7 +149,8 @@ static int actually_do_remove(char *dir)
 void remove_umid_dir(void)
 {
         char dir[strlen(uml_dir) + UMID_LEN + 1];
-        if(!umid_inited) return;
+        if (!umid_owned)
+                return;
 
         sprintf(dir, "%s%s", uml_dir, umid);
         actually_do_remove(dir);
@@ -155,11 +158,12 @@ void remove_umid_dir(void)
 
 char *get_umid(int only_if_set)
 {
-        if(only_if_set && umid_is_random) return(NULL);
-        return(umid);
+        if(only_if_set && umid_is_random)
+                return NULL;
+        return umid;
 }
 
-int not_dead_yet(char *dir)
+static int not_dead_yet(char *dir)
 {
         char file[strlen(uml_dir) + UMID_LEN + sizeof("/pid\0")];
         char pid[sizeof("nnnnn\0")], *end;
@@ -193,7 +197,8 @@ int not_dead_yet(char *dir)
                    (p == CHOOSE_MODE(tracing_pid, os_getpid())))
                         dead = 1;
         }
-        if(!dead) return(1);
+        if(!dead)
+                return(1);
         return(actually_do_remove(dir));
 }
 
@@ -232,16 +237,13 @@ static int __init make_uml_dir(void)
                 strlcpy(dir, home, sizeof(dir));
                 uml_dir++;
         }
+        strlcat(dir, uml_dir, sizeof(dir));
         len = strlen(dir);
-        strncat(dir, uml_dir, sizeof(dir) - len);
-        len = strlen(dir);
-        if((len > 0) && (len < sizeof(dir) - 1) && (dir[len - 1] != '/')){
-                dir[len] = '/';
-                dir[len + 1] = '\0';
-        }
+        if (len > 0 && dir[len - 1] != '/')
+                strlcat(dir, "/", sizeof(dir));
 
         uml_dir = malloc(strlen(dir) + 1);
-        if(uml_dir == NULL){
+        if (uml_dir == NULL) {
                 printf("make_uml_dir : malloc failed, errno = %d\n", errno);
                 exit(1);
         }
@@ -286,6 +288,7 @@ static int __init make_umid(int (*printer)(const char *fmt, ...))
                 if(errno == EEXIST){
                         if(not_dead_yet(tmp)){
                                 (*printer)("umid '%s' is in use\n", umid);
+                                umid_owned = 0;
                                 return(-1);
                         }
                         err = mkdir(tmp, 0777);
@@ -296,7 +299,8 @@ static int __init make_umid(int (*printer)(const char *fmt, ...))
                 return(-1);
         }
 
-        return(0);
+        umid_owned = 1;
+        return 0;
 }
 
 __uml_setup("uml_dir=", set_uml_dir,
@@ -309,7 +313,8 @@ static int __init make_umid_setup(void)
         /* one function with the ordering we need ... */
         make_uml_dir();
         make_umid(printf);
-        return create_pid_file();
+        create_pid_file();
+        return 0;
 }
 __uml_postsetup(make_umid_setup);