[kernel] add experimental fix for OCF on 2.6.27.y (closes #4184)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13341 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 197 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.27/973-ocf_2.6.27_fix.patch b/target/linux/generic-2.6/patches-2.6.27/973-ocf_2.6.27_fix.patch
new file mode 100644
index 000000000..6ffce01a2
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.27/973-ocf_2.6.27_fix.patch
@@ -0,0 +1,197 @@
+--- a/crypto/ocf/random.c
++++ b/crypto/ocf/random.c
+@@ -49,6 +49,7 @@
+ #include <linux/unistd.h>
+ #include <linux/poll.h>
+ #include <linux/random.h>
++#include <linux/kthread.h>
+ #include <cryptodev.h>
+ 
+ #ifdef CONFIG_OCF_FIPS
+@@ -81,7 +82,7 @@ struct random_op {
+ 
+ static int random_proc(void *arg);
+ 
+-static pid_t		randomproc = (pid_t) -1;
++static struct task_struct *random_task;
+ static spinlock_t	random_lock;
+ 
+ /*
+@@ -141,13 +142,18 @@ crypto_rregister(
+ 	spin_lock_irqsave(&random_lock, flags);
+ 	list_add_tail(&rops->random_list, &random_ops);
+ 	if (!started) {
+-		randomproc = kernel_thread(random_proc, NULL, CLONE_FS|CLONE_FILES);
+-		if (randomproc < 0) {
+-			ret = randomproc;
++		struct task_struct *t;
++
++		t = kthread_create(random_proc, NULL, "ocf-random");
++		if (IS_ERR(t)) {
+ 			printk("crypto: crypto_rregister cannot start random thread; "
+ 					"error %d", ret);
+-		} else
++			ret = PTR_ERR(t);
++		} else {
++			random_task = t;
++			wake_up_process(t);
+ 			started = 1;
++		}
+ 	}
+ 	spin_unlock_irqrestore(&random_lock, flags);
+ 
+@@ -172,7 +178,7 @@ crypto_runregister_all(u_int32_t driveri
+ 
+ 	spin_lock_irqsave(&random_lock, flags);
+ 	if (list_empty(&random_ops) && started)
+-		kill_proc(randomproc, SIGKILL, 1);
++		send_sig(SIGKILL, random_task, 1);
+ 	spin_unlock_irqrestore(&random_lock, flags);
+ 	return(0);
+ }
+@@ -308,7 +314,7 @@ random_proc(void *arg)
+ 
+ bad_alloc:
+ 	spin_lock_irq(&random_lock);
+-	randomproc = (pid_t) -1;
++	random_task = NULL;
+ 	started = 0;
+ 	spin_unlock_irq(&random_lock);
+ 
+--- a/crypto/ocf/crypto.c
++++ b/crypto/ocf/crypto.c
+@@ -74,6 +74,7 @@ __FBSDID("$FreeBSD: src/sys/opencrypto/c
+ #include <linux/sched.h>
+ #include <linux/spinlock.h>
+ #include <linux/version.h>
++#include <linux/kthread.h>
+ #include <cryptodev.h>
+ 
+ /*
+@@ -255,10 +256,10 @@ module_param(crypto_devallowsoft, int, 0
+ MODULE_PARM_DESC(crypto_devallowsoft,
+ 	   "Enable/disable use of software crypto support");
+ 
+-static pid_t	cryptoproc = (pid_t) -1;
++static struct task_struct *crypto_task;
+ static struct	completion cryptoproc_exited;
+ static DECLARE_WAIT_QUEUE_HEAD(cryptoproc_wait);
+-static pid_t	cryptoretproc = (pid_t) -1;
++static struct task_struct *cryptoret_task;
+ static struct	completion cryptoretproc_exited;
+ static DECLARE_WAIT_QUEUE_HEAD(cryptoretproc_wait);
+ 
+@@ -1401,7 +1402,7 @@ crypto_proc(void *arg)
+ 			wait_event_interruptible(cryptoproc_wait,
+ 					!(list_empty(&crp_q) || crypto_all_qblocked) ||
+ 					!(list_empty(&crp_kq) || crypto_all_kqblocked) ||
+-					cryptoproc == (pid_t) -1);
++					crypto_task == NULL);
+ 			crp_sleep = 0;
+ 			if (signal_pending (current)) {
+ #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+@@ -1414,7 +1415,7 @@ crypto_proc(void *arg)
+ 			}
+ 			CRYPTO_Q_LOCK();
+ 			dprintk("%s - awake\n", __FUNCTION__);
+-			if (cryptoproc == (pid_t) -1)
++			if (crypto_task == NULL)
+ 				break;
+ 			cryptostats.cs_intrs++;
+ 		}
+@@ -1470,7 +1471,7 @@ crypto_ret_proc(void *arg)
+ 			dprintk("%s - sleeping\n", __FUNCTION__);
+ 			CRYPTO_RETQ_UNLOCK();
+ 			wait_event_interruptible(cryptoretproc_wait,
+-					cryptoretproc == (pid_t) -1 ||
++					cryptoret_task == NULL ||
+ 					!list_empty(&crp_ret_q) ||
+ 					!list_empty(&crp_ret_kq));
+ 			if (signal_pending (current)) {
+@@ -1484,7 +1485,7 @@ crypto_ret_proc(void *arg)
+ 			}
+ 			CRYPTO_RETQ_LOCK();
+ 			dprintk("%s - awake\n", __FUNCTION__);
+-			if (cryptoretproc == (pid_t) -1) {
++			if (cryptoret_task == NULL) {
+ 				dprintk("%s - EXITING!\n", __FUNCTION__);
+ 				break;
+ 			}
+@@ -1597,6 +1598,7 @@ DB_SHOW_COMMAND(kcrypto, db_show_kcrypto
+ static int
+ crypto_init(void)
+ {
++	struct task_struct *t;
+ 	int error;
+ 
+ 	dprintk("%s(0x%x)\n", __FUNCTION__, (int) crypto_init);
+@@ -1643,23 +1645,27 @@ crypto_init(void)
+ 	init_completion(&cryptoproc_exited);
+ 	init_completion(&cryptoretproc_exited);
+ 
+-	cryptoproc = 0; /* to avoid race condition where proc runs first */
+-	cryptoproc = kernel_thread(crypto_proc, NULL, CLONE_FS|CLONE_FILES);
+-	if (cryptoproc < 0) {
+-		error = cryptoproc;
++	crypto_task = NULL; /* to avoid race condition where proc runs first */
++	t = kthread_create(crypto_proc, NULL, "ocf-crypto");
++	if (IS_ERR(t)) {
++		error = PTR_ERR(t);
+ 		printk("crypto: crypto_init cannot start crypto thread; error %d",
+ 			error);
+ 		goto bad;
+ 	}
++	wake_up_process(t);
++	crypto_task = t;
+ 
+-	cryptoretproc = 0; /* to avoid race condition where proc runs first */
+-	cryptoretproc = kernel_thread(crypto_ret_proc, NULL, CLONE_FS|CLONE_FILES);
+-	if (cryptoretproc < 0) {
+-		error = cryptoretproc;
++	cryptoret_task = NULL; /* to avoid race condition where proc runs first */
++	t = kthread_create(crypto_ret_proc, NULL, "ocf-cryptoret");
++	if (IS_ERR(t)) {
++		error = PTR_ERR(t);
+ 		printk("crypto: crypto_init cannot start cryptoret thread; error %d",
+ 				error);
+ 		goto bad;
+ 	}
++	wake_up_process(t);
++	cryptoret_task = t;
+ 
+ 	return 0;
+ bad:
+@@ -1671,7 +1677,7 @@ bad:
+ static void
+ crypto_exit(void)
+ {
+-	pid_t p;
++	struct task_struct *t;
+ 	unsigned long d_flags;
+ 
+ 	dprintk("%s()\n", __FUNCTION__);
+@@ -1681,18 +1687,18 @@ crypto_exit(void)
+ 	 */
+ 
+ 	CRYPTO_DRIVER_LOCK();
+-	p = cryptoproc;
+-	cryptoproc = (pid_t) -1;
+-	kill_proc(p, SIGTERM, 1);
++	t = crypto_task;
++	crypto_task = NULL;
++	send_sig(SIGTERM, t, 1);
+ 	wake_up_interruptible(&cryptoproc_wait);
+ 	CRYPTO_DRIVER_UNLOCK();
+ 
+ 	wait_for_completion(&cryptoproc_exited);
+ 
+ 	CRYPTO_DRIVER_LOCK();
+-	p = cryptoretproc;
+-	cryptoretproc = (pid_t) -1;
+-	kill_proc(p, SIGTERM, 1);
++	t = cryptoret_task;
++	cryptoret_task = NULL;
++	send_sig(SIGTERM, t, 1);
+ 	wake_up_interruptible(&cryptoretproc_wait);
+ 	CRYPTO_DRIVER_UNLOCK();
+