Re: [linux-usb-devel] Removing Gadget File Storage module

[Alan Stern]

On Tue, 29 May 2007, Ragner N Magalhães wrote:

> On 5/28/07, Alan Stern <[EMAIL PROTECTED]> wrote:
> > On Mon, 28 May 2007, Ragner N Magalhães wrote:
> >
> > > Hi all,
> > >  I am working with OMAP H2 and when I run "rmmod g_file_storage", it
> > > stay waiting some thing and not terminate ...
> > >
> > >  Somebody know some thing about this ?
> >
> > Which version of the Linux kernel are you using?
> 
> I am using the last omap git tree from
> http://www.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap-2.6.git

The same thing happened to me when I tried using g_file_storage on a
recent kernel.  The answer turns out to be that signal handling for
kernel threads was changed in 2.6.22.  The patch below fixed the driver
on my system.

Alan Stern


Index: usb-2.6/drivers/usb/gadget/file_storage.c
===================================================================
--- usb-2.6.orig/drivers/usb/gadget/file_storage.c
+++ usb-2.6/drivers/usb/gadget/file_storage.c
@@ -686,7 +686,6 @@ struct fsg_dev {
        int                     thread_wakeup_needed;
        struct completion       thread_notifier;
        struct task_struct      *thread_task;
-       sigset_t                thread_signal_mask;
 
        int                     cmnd_size;
        u8                      cmnd[MAX_COMMAND_SIZE];
@@ -3277,8 +3276,7 @@ static void handle_exception(struct fsg_
        /* Clear the existing signals.  Anything but SIGUSR1 is converted
         * into a high-priority EXIT exception. */
        for (;;) {
-               sig = dequeue_signal_lock(current, &fsg->thread_signal_mask,
-                               &info);
+               sig = dequeue_signal_lock(current, &current->blocked, &info);
                if (!sig)
                        break;
                if (sig != SIGUSR1) {
@@ -3431,10 +3429,10 @@ static int fsg_main_thread(void *fsg_)
 
        /* Allow the thread to be killed by a signal, but set the signal mask
         * to block everything but INT, TERM, KILL, and USR1. */
-       siginitsetinv(&fsg->thread_signal_mask, sigmask(SIGINT) |
-                       sigmask(SIGTERM) | sigmask(SIGKILL) |
-                       sigmask(SIGUSR1));
-       sigprocmask(SIG_SETMASK, &fsg->thread_signal_mask, NULL);
+       allow_signal(SIGINT);
+       allow_signal(SIGTERM);
+       allow_signal(SIGKILL);
+       allow_signal(SIGUSR1);
 
        /* Arrange for userspace references to be interpreted as kernel
         * pointers.  That way we can pass a kernel pointer to a routine


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