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Code Activity

scd: Serialize opening device by select_application.

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* scd/app.c (app_new_register): Don't lock APP_LIST_LOCK here.
(select_application): Lock with APP_LIST_LOCK earlier.

--

What we want to do here is to serialize the call of
select_application.  In the old code, it was possible
that a call of select_application was blocked internally,
and then another call of select_application entered.

We can have a dedicated lock for call of select_application,
but it is easier to re-use APP_LIST_LOCK.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
This commit is contained in:
NIIBE Yutaka 2018-11-28 14:59:44 +09:00
parent 483e63f9b5
commit 47106ac435
1 changed files with 6 additions and 5 deletions
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9
scd/app.c
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@ -299,11 +299,8 @@ app_new_register (int slot, ctrl_t ctrl, const char *name,
}
app->periodical_check_needed = periodical_check_needed;
npth_mutex_lock (&app_list_lock);
app->next = app_top;
app_top = app;
npth_mutex_unlock (&app_list_lock);
unlock_app (app);
return 0;
}
@ -322,6 +319,8 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
*r_app = NULL;
npth_mutex_lock (&app_list_lock);
if (scan || !app_top)
{
struct dev_list *l;
@ -330,7 +329,10 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
/* Scan the devices to find new device(s). */
err = apdu_dev_list_start (opt.reader_port, &l);
if (err)
{
npth_mutex_unlock (&app_list_lock);
return err;
}
while (1)
{
@ -365,7 +367,6 @@ select_application (ctrl_t ctrl, const char *name, app_t *r_app,
scd_kick_the_loop ();
}
npth_mutex_lock (&app_list_lock);
for (a = app_top; a; a = a->next)
{
lock_app (a, ctrl);