Question: why do we need to disable irqs in exit_io_context() ?
Why do we need ->alloc_lock to clear io_context->task ?
In other words, could you explain why the patch below is not correct.
Thanks,
Oleg.
--- 2.6.18-rc4/block/ll_rw_blk.c~6_exit 2006-08-20 19:30:10.000000000 +0400
+++ 2.6.18-rc4/block/ll_rw_blk.c 2006-08-20 22:34:46.000000000 +0400
@@ -3580,25 +3580,22 @@ EXPORT_SYMBOL(put_io_context);
/* Called by the exitting task */
void exit_io_context(void)
{
- unsigned long flags;
struct io_context *ioc;
struct cfq_io_context *cic;
- local_irq_save(flags);
task_lock(current);
ioc = current->io_context;
current->io_context = NULL;
- ioc->task = NULL;
task_unlock(current);
- local_irq_restore(flags);
+ ioc->task = NULL;
if (ioc->aic && ioc->aic->exit)
ioc->aic->exit(ioc->aic);
if (ioc->cic_root.rb_node != NULL) {
cic = rb_entry(rb_first(&ioc->cic_root), struct cfq_io_context, rb_node);
cic->exit(ioc);
}
-
+
put_io_context(ioc);
}
-
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