Adding debian version 4.19.249-2.debian/4.19.249-2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 115 insertions, 0 deletions

diff --git a/debian/patches-rt/0091-pci-switchtec-Don-t-use-completion-s-wait-queue.patch b/debian/patches-rt/0091-pci-switchtec-Don-t-use-completion-s-wait-queue.patch
new file mode 100644
index 000000000..c42b306c1
--- /dev/null
+++ b/debian/patches-rt/0091-pci-switchtec-Don-t-use-completion-s-wait-queue.patch
@@ -0,0 +1,115 @@
+From aec60cbb460a43de9b530e8b08d24c032292c210 Mon Sep 17 00:00:00 2001
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Wed, 4 Oct 2017 10:24:23 +0200
+Subject: [PATCH 091/347] pci/switchtec: Don't use completion's wait queue
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
+
+The poll callback is using completion's wait_queue_head_t member and
+puts it in poll_wait() so the poll() caller gets a wakeup after command
+completed. This does not work on RT because we don't have a
+wait_queue_head_t in our completion implementation. Nobody in tree does
+like that in tree so this is the only driver that breaks.
+
+Instead of using the completion here is waitqueue with a status flag as
+suggested by Logan.
+
+I don't have the HW so I have no idea if it works as expected, so please
+test it.
+
+Cc: Kurt Schwemmer <kurt.schwemmer@microsemi.com>
+Cc: Logan Gunthorpe <logang@deltatee.com>
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+---
+ drivers/pci/switch/switchtec.c | 22 +++++++++++++---------
+ 1 file changed, 13 insertions(+), 9 deletions(-)
+
+diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
+index 291c0074ad6f..a8df847bedee 100644
+--- a/drivers/pci/switch/switchtec.c
++++ b/drivers/pci/switch/switchtec.c
+@@ -43,10 +43,11 @@ struct switchtec_user {
+ 
+ 	enum mrpc_state state;
+ 
+-	struct completion comp;
++	wait_queue_head_t cmd_comp;
+ 	struct kref kref;
+ 	struct list_head list;
+ 
++	bool cmd_done;
+ 	u32 cmd;
+ 	u32 status;
+ 	u32 return_code;
+@@ -68,7 +69,7 @@ static struct switchtec_user *stuser_create(struct switchtec_dev *stdev)
+ 	stuser->stdev = stdev;
+ 	kref_init(&stuser->kref);
+ 	INIT_LIST_HEAD(&stuser->list);
+-	init_completion(&stuser->comp);
++	init_waitqueue_head(&stuser->cmd_comp);
+ 	stuser->event_cnt = atomic_read(&stdev->event_cnt);
+ 
+ 	dev_dbg(&stdev->dev, "%s: %p\n", __func__, stuser);
+@@ -147,7 +148,7 @@ static int mrpc_queue_cmd(struct switchtec_user *stuser)
+ 	kref_get(&stuser->kref);
+ 	stuser->read_len = sizeof(stuser->data);
+ 	stuser_set_state(stuser, MRPC_QUEUED);
+-	reinit_completion(&stuser->comp);
++	stuser->cmd_done = false;
+ 	list_add_tail(&stuser->list, &stdev->mrpc_queue);
+ 
+ 	mrpc_cmd_submit(stdev);
+@@ -184,7 +185,8 @@ static void mrpc_complete_cmd(struct switchtec_dev *stdev)
+ 		      stuser->read_len);
+ 
+ out:
+-	complete_all(&stuser->comp);
++	stuser->cmd_done = true;
++	wake_up_interruptible(&stuser->cmd_comp);
+ 	list_del_init(&stuser->list);
+ 	stuser_put(stuser);
+ 	stdev->mrpc_busy = 0;
+@@ -454,10 +456,11 @@ static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
+ 	mutex_unlock(&stdev->mrpc_mutex);
+ 
+ 	if (filp->f_flags & O_NONBLOCK) {
+-		if (!try_wait_for_completion(&stuser->comp))
++		if (!READ_ONCE(stuser->cmd_done))
+ 			return -EAGAIN;
+ 	} else {
+-		rc = wait_for_completion_interruptible(&stuser->comp);
++		rc = wait_event_interruptible(stuser->cmd_comp,
++					      stuser->cmd_done);
+ 		if (rc < 0)
+ 			return rc;
+ 	}
+@@ -505,7 +508,7 @@ static __poll_t switchtec_dev_poll(struct file *filp, poll_table *wait)
+ 	struct switchtec_dev *stdev = stuser->stdev;
+ 	__poll_t ret = 0;
+ 
+-	poll_wait(filp, &stuser->comp.wait, wait);
++	poll_wait(filp, &stuser->cmd_comp, wait);
+ 	poll_wait(filp, &stdev->event_wq, wait);
+ 
+ 	if (lock_mutex_and_test_alive(stdev))
+@@ -513,7 +516,7 @@ static __poll_t switchtec_dev_poll(struct file *filp, poll_table *wait)
+ 
+ 	mutex_unlock(&stdev->mrpc_mutex);
+ 
+-	if (try_wait_for_completion(&stuser->comp))
++	if (READ_ONCE(stuser->cmd_done))
+ 		ret |= EPOLLIN | EPOLLRDNORM;
+ 
+ 	if (stuser->event_cnt != atomic_read(&stdev->event_cnt))
+@@ -1037,7 +1040,8 @@ static void stdev_kill(struct switchtec_dev *stdev)
+ 
+ 	/* Wake up and kill any users waiting on an MRPC request */
+ 	list_for_each_entry_safe(stuser, tmpuser, &stdev->mrpc_queue, list) {
+-		complete_all(&stuser->comp);
++		stuser->cmd_done = true;
++		wake_up_interruptible(&stuser->cmd_comp);
+ 		list_del_init(&stuser->list);
+ 		stuser_put(stuser);
+ 	}
+-- 
+2.36.1
+