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authorAlan Stern <stern@rowland.harvard.edu>2005-09-26 16:12:02 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 16:47:42 -0700
commit22efcf4adec4262e0f49e6225f6cd070e4a85d20 (patch)
tree416d2fbb46995ad9483e1dee758ee818292e2ed9 /drivers/usb/gadget
parentdabb592816444fcba1a771e27d4f72a2b8218374 (diff)
[PATCH] USB: File-Storage gadget: use the kthread API
This patch (as566) converts the File-Storage gadget over to the kthread API. The new code doesn't use kthread_stop because the control thread needs to terminate asynchronously when it receives a signal. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> drivers/usb/gadget/file_storage.c | 32 +++++++++++++------------------- 1 file changed, 13 insertions(+), 19 deletions(-)
Diffstat (limited to 'drivers/usb/gadget')
-rw-r--r--drivers/usb/gadget/file_storage.c32
1 files changed, 13 insertions, 19 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index a41d9d4baee..241c570e541 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -224,6 +224,7 @@
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
+#include <linux/kthread.h>
#include <linux/limits.h>
#include <linux/list.h>
#include <linux/module.h>
@@ -669,7 +670,6 @@ struct fsg_dev {
wait_queue_head_t thread_wqh;
int thread_wakeup_needed;
struct completion thread_notifier;
- int thread_pid;
struct task_struct *thread_task;
sigset_t thread_signal_mask;
@@ -1084,7 +1084,6 @@ static void wakeup_thread(struct fsg_dev *fsg)
static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
{
unsigned long flags;
- struct task_struct *thread_task;
/* Do nothing if a higher-priority exception is already in progress.
* If a lower-or-equal priority exception is in progress, preempt it
@@ -1093,9 +1092,9 @@ static void raise_exception(struct fsg_dev *fsg, enum fsg_state new_state)
if (fsg->state <= new_state) {
fsg->exception_req_tag = fsg->ep0_req_tag;
fsg->state = new_state;
- thread_task = fsg->thread_task;
- if (thread_task)
- send_sig_info(SIGUSR1, SEND_SIG_FORCED, thread_task);
+ if (fsg->thread_task)
+ send_sig_info(SIGUSR1, SEND_SIG_FORCED,
+ fsg->thread_task);
}
spin_unlock_irqrestore(&fsg->lock, flags);
}
@@ -3383,11 +3382,6 @@ static int fsg_main_thread(void *fsg_)
{
struct fsg_dev *fsg = (struct fsg_dev *) fsg_;
- fsg->thread_task = current;
-
- /* Release all our userspace resources */
- daemonize("file-storage-gadget");
-
/* 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) |
@@ -3400,9 +3394,6 @@ static int fsg_main_thread(void *fsg_)
* that expects a __user pointer and it will work okay. */
set_fs(get_ds());
- /* Wait for the gadget registration to finish up */
- wait_for_completion(&fsg->thread_notifier);
-
/* The main loop */
while (fsg->state != FSG_STATE_TERMINATED) {
if (exception_in_progress(fsg) || signal_pending(current)) {
@@ -3440,8 +3431,9 @@ static int fsg_main_thread(void *fsg_)
spin_unlock_irq(&fsg->lock);
}
+ spin_lock_irq(&fsg->lock);
fsg->thread_task = NULL;
- flush_signals(current);
+ spin_unlock_irq(&fsg->lock);
/* In case we are exiting because of a signal, unregister the
* gadget driver and close the backing file. */
@@ -3959,10 +3951,12 @@ static int __init fsg_bind(struct usb_gadget *gadget)
sprintf(&serial[i], "%02X", c);
}
- if ((rc = kernel_thread(fsg_main_thread, fsg, (CLONE_VM | CLONE_FS |
- CLONE_FILES))) < 0)
+ fsg->thread_task = kthread_create(fsg_main_thread, fsg,
+ "file-storage-gadget");
+ if (IS_ERR(fsg->thread_task)) {
+ rc = PTR_ERR(fsg->thread_task);
goto out;
- fsg->thread_pid = rc;
+ }
INFO(fsg, DRIVER_DESC ", version: " DRIVER_VERSION "\n");
INFO(fsg, "Number of LUNs=%d\n", fsg->nluns);
@@ -3994,7 +3988,7 @@ static int __init fsg_bind(struct usb_gadget *gadget)
DBG(fsg, "removable=%d, stall=%d, buflen=%u\n",
mod_data.removable, mod_data.can_stall,
mod_data.buflen);
- DBG(fsg, "I/O thread pid: %d\n", fsg->thread_pid);
+ DBG(fsg, "I/O thread pid: %d\n", fsg->thread_task->pid);
return 0;
autoconf_fail:
@@ -4093,7 +4087,7 @@ static int __init fsg_init(void)
set_bit(REGISTERED, &fsg->atomic_bitflags);
/* Tell the thread to start working */
- complete(&fsg->thread_notifier);
+ wake_up_process(fsg->thread_task);
return 0;
}
module_init(fsg_init);