Epoll based IRQ controller
1. Removes the need to walk the IRQ/Device list to determine
who triggered the IRQ.
2. Improves scalability (up to several times performance
improvement for cases with 10s of devices).
3. Improves UML baseline IO performance for one disk + one NIC
use case by up to 10%.
4. Introduces write poll triggered IRQs.
5. Prerequisite for introducing high performance mmesg family
of functions in network IO.
6. Fixes RNG shutdown which was leaking a file descriptor
Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
index 37c51a6..778a0e5 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -13,6 +13,7 @@
#include <linux/miscdevice.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
+#include <init.h>
#include <irq_kern.h>
#include <os.h>
@@ -154,7 +155,14 @@ static int __init rng_init (void)
/*
* rng_cleanup - shutdown RNG module
*/
-static void __exit rng_cleanup (void)
+
+static void cleanup(void)
+{
+ free_irq_by_fd(random_fd);
+ os_close_file(random_fd);
+}
+
+static void __exit rng_cleanup(void)
{
os_close_file(random_fd);
misc_deregister (&rng_miscdev);
@@ -162,6 +170,7 @@ static void __exit rng_cleanup (void)
module_init (rng_init);
module_exit (rng_cleanup);
+__uml_exitcall(cleanup);
MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
MODULE_LICENSE("GPL");