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authorJames Bottomley <jejb@titanic.(none)>2005-09-19 09:50:04 -0500
committerJames Bottomley <jejb@titanic.(none)>2005-09-19 09:50:04 -0500
commit3ed7a4704beb66a155acd67b78b7e9a5674d55fb (patch)
tree0a0ad71a64888fb2ab69e2b0acb99005dbc3af04
parent939647ee308e0ad924e776657704c7bedd498664 (diff)
[SCSI] Fix thread termination for the SCSI error handle
From: Alan Stern <stern@rowland.harvard.edu> This patch (as561) fixes the error handler's thread-exit code. The kthread_stop call won't wake the thread from a down_interruptible, so the patch gets rid of the semaphore and simply does set_current_state(TASK_INTERRUPTIBLE); Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Modified to simplify the termination loop and correct the sleep condition. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
-rw-r--r--drivers/scsi/scsi_error.c55
-rw-r--r--include/scsi/scsi_host.h2
2 files changed, 23 insertions, 34 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index af589fac814d..ad5342165079 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -50,7 +50,7 @@
void scsi_eh_wakeup(struct Scsi_Host *shost)
{
if (shost->host_busy == shost->host_failed) {
- up(shost->eh_wait);
+ wake_up_process(shost->ehandler);
SCSI_LOG_ERROR_RECOVERY(5,
printk("Waking error handler thread\n"));
}
@@ -70,7 +70,7 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
unsigned long flags;
int ret = 0;
- if (shost->eh_wait == NULL)
+ if (!shost->ehandler)
return 0;
spin_lock_irqsave(shost->host_lock, flags);
@@ -1591,40 +1591,31 @@ int scsi_error_handler(void *data)
{
struct Scsi_Host *shost = (struct Scsi_Host *) data;
int rtn;
- DECLARE_MUTEX_LOCKED(sem);
current->flags |= PF_NOFREEZE;
- shost->eh_wait = &sem;
+
/*
- * Wake up the thread that created us.
+ * Note - we always use TASK_INTERRUPTIBLE even if the module
+ * was loaded as part of the kernel. The reason is that
+ * UNINTERRUPTIBLE would cause this thread to be counted in
+ * the load average as a running process, and an interruptible
+ * wait doesn't.
*/
- SCSI_LOG_ERROR_RECOVERY(3, printk("Wake up parent of"
- " scsi_eh_%d\n",shost->host_no));
-
- while (1) {
- /*
- * If we get a signal, it means we are supposed to go
- * away and die. This typically happens if the user is
- * trying to unload a module.
- */
- SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler"
- " scsi_eh_%d"
- " sleeping\n",shost->host_no));
-
- /*
- * Note - we always use down_interruptible with the semaphore
- * even if the module was loaded as part of the kernel. The
- * reason is that down() will cause this thread to be counted
- * in the load average as a running process, and down
- * interruptible doesn't. Given that we need to allow this
- * thread to die if the driver was loaded as a module, using
- * semaphores isn't unreasonable.
- */
- down_interruptible(&sem);
- if (kthread_should_stop())
- break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ while (!kthread_should_stop()) {
+ if (shost->host_failed == 0 ||
+ shost->host_failed != shost->host_busy) {
+ SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler"
+ " scsi_eh_%d"
+ " sleeping\n",
+ shost->host_no));
+ schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
+ continue;
+ }
+ __set_current_state(TASK_RUNNING);
SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler"
" scsi_eh_%d waking"
" up\n",shost->host_no));
@@ -1651,7 +1642,7 @@ int scsi_error_handler(void *data)
* which are still online.
*/
scsi_restart_operations(shost);
-
+ set_current_state(TASK_INTERRUPTIBLE);
}
SCSI_LOG_ERROR_RECOVERY(1, printk("Error handler scsi_eh_%d"
@@ -1660,7 +1651,7 @@ int scsi_error_handler(void *data)
/*
* Make sure that nobody tries to wake us up again.
*/
- shost->eh_wait = NULL;
+ shost->ehandler = NULL;
return 0;
}
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 540369ff815c..69313ba7505b 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -467,8 +467,6 @@ struct Scsi_Host {
struct list_head eh_cmd_q;
struct task_struct * ehandler; /* Error recovery thread. */
- struct semaphore * eh_wait; /* The error recovery thread waits
- on this. */
struct semaphore * eh_action; /* Wait for specific actions on the
host. */
unsigned int eh_active:1; /* Indicates the eh thread is awake and active if