Patch "soc/fsl/qbman: fix issue in qman_delete_cgr_safe()" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

soc/fsl/qbman: fix issue in qman_delete_cgr_safe()

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
soc-fsl-qbman-fix-issue-in-qman_delete_cgr_safe.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Madalin Bucur <[email protected]>
Date: Wed, 14 Mar 2018 08:37:28 -0500
Subject: soc/fsl/qbman: fix issue in qman_delete_cgr_safe()

From: Madalin Bucur <[email protected]>

[ Upstream commit 96f413f47677366e0ae03797409bfcc4151dbf9e ]

The wait_for_completion() call in qman_delete_cgr_safe() was triggering a scheduling while atomic bug, replacing the kthread with a smp_call_function_single() call to fix it.

---
 drivers/soc/fsl/qbman/qman.c |   28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

@@ -2443,39 +2443,21 @@ struct cgr_comp {
 	struct completion completion;
 };
 
-static int qman_delete_cgr_thread(void *p)
+static void qman_delete_cgr_smp_call(void *p)
 {
-	struct cgr_comp *cgr_comp = (struct cgr_comp *)p;
-	int ret;
-
-	ret = qman_delete_cgr(cgr_comp->cgr);
-	complete(&cgr_comp->completion);
-
-	return ret;
+	qman_delete_cgr((struct qman_cgr *)p);
 }
 
 void qman_delete_cgr_safe(struct qman_cgr *cgr)
 {
-	struct task_struct *thread;
-	struct cgr_comp cgr_comp;
-
 	preempt_disable();
 	if (qman_cgr_cpus[cgr->cgrid] != smp_processor_id()) {
-		init_completion(&cgr_comp.completion);
-		cgr_comp.cgr = cgr;
-		thread = kthread_create(qman_delete_cgr_thread, &cgr_comp,
-					"cgr_del");
-
-		if (IS_ERR(thread))
-			goto out;
-
-		kthread_bind(thread, qman_cgr_cpus[cgr->cgrid]);
-		wake_up_process(thread);
-		wait_for_completion(&cgr_comp.completion);
+		smp_call_function_single(qman_cgr_cpus[cgr->cgrid],
+					 qman_delete_cgr_smp_call, cgr, true);
 		preempt_enable();
 		return;
 	}
-out:
+
 	qman_delete_cgr(cgr);
 	preempt_enable();
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/dpaa_eth-remove-duplicate-increment-of-the-tx_errors-counter.patch queue-4.15/soc-fsl-qbman-fix-issue-in-qman_delete_cgr_safe.patch queue-4.15/dpaa_eth-fix-error-in-dpaa_remove.patch