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uml: simplify helper stack handling 

run_helper and run_helper_thread had arguments which were the same in all
callers.  run_helper's stack_out was always NULL and run_helper_thread's
stack_order was always 0.  These are now gone, and the constants folded
into the code.

Also fixed leaks of the helper stack in the AIO and SIGIO code.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2007-07-15 23:38:56 -07:00 committed by Linus Torvalds
parent 42a359e31a
commit c43990162f
13 changed files with 36 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/um/drivers/chan_user.c
View File

@ -161,7 +161,7 @@ static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out,
* problem with /dev/net/tun, which if held open by this
* thread, prevents the TUN/TAP device from being reused.
*/
err = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out, 0);
err = run_helper_thread(winch_thread, &data, CLONE_FILES, stack_out);
if(err < 0){
printk("fork of winch_thread failed - errno = %d\n", -err);
goto out_close;

2
arch/um/drivers/harddog_user.c
View File

@ -68,7 +68,7 @@ int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
args = pid_args;
}
pid = run_helper(pre_exec, &data, args, NULL);
pid = run_helper(pre_exec, &data, args);
os_close_file(out_fds[0]);
os_close_file(in_fds[1]);

2
arch/um/drivers/net_user.c
View File

@ -187,7 +187,7 @@ static int change_tramp(char **argv, char *output, int output_len)
}
pe_data.close_me = fds[0];
pe_data.stdout = fds[1];
pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
pid = run_helper(change_pre_exec, &pe_data, argv);
if (pid > 0) /* Avoid hang as we won't get data in failure case. */
read_output(fds[0], output, output_len);

2
arch/um/drivers/port_user.c
View File

@ -188,7 +188,7 @@ int port_connection(int fd, int *socket, int *pid_out)
{ .sock_fd = new,
.pipe_fd = socket[1] });
err = run_helper(port_pre_exec, &data, argv, NULL);
err = run_helper(port_pre_exec, &data, argv);
if(err < 0)
goto out_shutdown;

2
arch/um/drivers/slip_user.c
View File

@ -85,7 +85,7 @@ static int slip_tramp(char **argv, int fd)
pe_data.stdin = fd;
pe_data.stdout = fds[1];
pe_data.close_me = fds[0];
err = run_helper(slip_pre_exec, &pe_data, argv, NULL);
err = run_helper(slip_pre_exec, &pe_data, argv);
if(err < 0)
goto out_close;
pid = err;

2
arch/um/drivers/slirp_user.c
View File

@ -42,7 +42,7 @@ static int slirp_tramp(char **argv, int fd)
pe_data.stdin = fd;
pe_data.stdout = fd;
pid = run_helper(slirp_pre_exec, &pe_data, argv, NULL);
pid = run_helper(slirp_pre_exec, &pe_data, argv);
return(pid);
}

2
arch/um/drivers/xterm.c
View File

@ -132,7 +132,7 @@ static int xterm_open(int input, int output, int primary, void *d,
}
sprintf(title, data->title, data->device);
pid = run_helper(NULL, NULL, argv, NULL);
pid = run_helper(NULL, NULL, argv);
if (pid < 0) {
err = pid;
printk(UM_KERN_ERR "xterm_open : run_helper failed, "

6
arch/um/include/os.h
View File

@ -239,11 +239,9 @@ extern unsigned long __do_user_copy(void *to, const void *from, int n,
/* execvp.c */
extern int execvp_noalloc(char *buf, const char *file, char *const argv[]);
/* helper.c */
extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
unsigned long *stack_out);
extern int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv);
extern int run_helper_thread(int (*proc)(void *), void *arg,
unsigned int flags, unsigned long *stack_out,
int stack_order);
unsigned int flags, unsigned long *stack_out);
extern int helper_wait(int pid);

11
arch/um/os-Linux/aio.c
View File

@ -177,6 +177,7 @@ static int do_not_aio(struct aio_thread_req *req)
static int aio_req_fd_r = -1;
static int aio_req_fd_w = -1;
static int aio_pid = -1;
static unsigned long aio_stack;
static int not_aio_thread(void *arg)
{
@ -212,7 +213,6 @@ static int not_aio_thread(void *arg)
static int init_aio_24(void)
{
unsigned long stack;
int fds[2], err;
err = os_pipe(fds, 1, 1);
@ -227,7 +227,7 @@ static int init_aio_24(void)
goto out_close_pipe;
err = run_helper_thread(not_aio_thread, NULL,
CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
CLONE_FILES | CLONE_VM | SIGCHLD, &aio_stack);
if(err < 0)
goto out_close_pipe;
@ -252,7 +252,6 @@ out:
#define DEFAULT_24_AIO 0
static int init_aio_26(void)
{
unsigned long stack;
int err;
if(io_setup(256, &ctx)){
@ -263,7 +262,7 @@ static int init_aio_26(void)
}
err = run_helper_thread(aio_thread, NULL,
CLONE_FILES | CLONE_VM | SIGCHLD, &stack, 0);
CLONE_FILES | CLONE_VM | SIGCHLD, &aio_stack);
if(err < 0)
return err;
@ -365,8 +364,10 @@ __initcall(init_aio);
static void exit_aio(void)
{
if(aio_pid != -1)
if (aio_pid != -1) {
os_kill_process(aio_pid, 1);
free_stack(aio_stack, 0);
}
}
__uml_exitcall(exit_aio);

2
arch/um/os-Linux/drivers/ethertap_user.c
View File

@ -117,7 +117,7 @@ static int etap_tramp(char *dev, char *gate, int control_me,
pe_data.control_remote = control_remote;
pe_data.control_me = control_me;
pe_data.data_me = data_me;
pid = run_helper(etap_pre_exec, &pe_data, args, NULL);
pid = run_helper(etap_pre_exec, &pe_data, args);
if(pid < 0)
err = pid;

2
arch/um/os-Linux/drivers/tuntap_user.c
View File

@ -83,7 +83,7 @@ static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
data.stdout = remote;
data.close_me = me;
pid = run_helper(tuntap_pre_exec, &data, argv, NULL);
pid = run_helper(tuntap_pre_exec, &data, argv);
if(pid < 0)
return -pid;

19
arch/um/os-Linux/helper.c
View File

@ -44,17 +44,13 @@ static int helper_child(void *arg)
/* Returns either the pid of the child process we run or -E* on failure.
* XXX The alloc_stack here breaks if this is called in the tracing thread, so
* we need to receive a preallocated stack (a local buffer is ok). */
int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv,
unsigned long *stack_out)
int run_helper(void (*pre_exec)(void *), void *pre_data, char **argv)
{
struct helper_data data;
unsigned long stack, sp;
int pid, fds[2], ret, n;
if ((stack_out != NULL) && (*stack_out != 0))
stack = *stack_out;
else
stack = alloc_stack(0, __cant_sleep());
stack = alloc_stack(0, __cant_sleep());
if (stack == 0)
return -ENOMEM;
@ -113,22 +109,21 @@ out_close:
close(fds[1]);
close(fds[0]);
out_free:
if ((stack_out == NULL) || (*stack_out == 0))
free_stack(stack, 0);
free_stack(stack, 0);
return ret;
}
int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
unsigned long *stack_out, int stack_order)
unsigned long *stack_out)
{
unsigned long stack, sp;
int pid, status, err;
stack = alloc_stack(stack_order, __cant_sleep());
stack = alloc_stack(0, __cant_sleep());
if (stack == 0)
return -ENOMEM;
sp = stack + (UM_KERN_PAGE_SIZE << stack_order) - sizeof(void *);
sp = stack + UM_KERN_PAGE_SIZE - sizeof(void *);
pid = clone(proc, (void *) sp, flags | SIGCHLD, arg);
if (pid < 0) {
err = -errno;
@ -147,7 +142,7 @@ int run_helper_thread(int (*proc)(void *), void *arg, unsigned int flags,
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
printk("run_helper_thread - thread returned status "
"0x%x\n", status);
free_stack(stack, stack_order);
free_stack(stack, 0);
} else
*stack_out = stack;
return pid;

19
arch/um/os-Linux/sigio.c
View File

@ -26,6 +26,7 @@
* exitcall.
*/
static int write_sigio_pid = -1;
static unsigned long write_sigio_stack;
/* These arrays are initialized before the sigio thread is started, and
* the descriptors closed after it is killed. So, it can't see them change.
@ -144,8 +145,10 @@ static void update_thread(void)
return;
fail:
/* Critical section start */
if(write_sigio_pid != -1)
if (write_sigio_pid != -1) {
os_kill_process(write_sigio_pid, 1);
free_stack(write_sigio_stack, 0);
}
write_sigio_pid = -1;
close(sigio_private[0]);
close(sigio_private[1]);
@ -243,7 +246,6 @@ static struct pollfd *setup_initial_poll(int fd)
static void write_sigio_workaround(void)
{
unsigned long stack;
struct pollfd *p;
int err;
int l_write_sigio_fds[2];
@ -293,7 +295,8 @@ static void write_sigio_workaround(void)
memcpy(sigio_private, l_sigio_private, sizeof(l_sigio_private));
write_sigio_pid = run_helper_thread(write_sigio_thread, NULL,
CLONE_FILES | CLONE_VM, &stack, 0);
CLONE_FILES | CLONE_VM,
&write_sigio_stack);
if (write_sigio_pid < 0)
goto out_clear;
@ -356,10 +359,12 @@ out:
static void sigio_cleanup(void)
{
if(write_sigio_pid != -1){
os_kill_process(write_sigio_pid, 1);
write_sigio_pid = -1;
}
if (write_sigio_pid == -1)
return;
os_kill_process(write_sigio_pid, 1);
free_stack(write_sigio_stack, 0);
write_sigio_pid = -1;
}
__uml_exitcall(sigio_cleanup);