qcacmn: Use global variable for cpumask

Local variable is used to store cpumask to send it to
irq_set_affinity_hint and qdf_dev_set_irq_affinity APIs.
This memory is used by the kernel later outside the
current contect resulting in invalid memory access.

Fix this by using global variables to store cpumask.

Change-Id: I086f40bf1b3499d2c2ccb1ce18140b2dc2761d04
CRs-Fixed: 2373548

hif/inc/hif.h

@@ -190,6 +190,7 @@ struct qca_napi_info {
 	uint8_t              id;
 	uint8_t              cpu;
 	int                  irq;
+	cpumask_t            cpumask;
 	struct qca_napi_stat stats[NR_CPUS];
 #ifdef RECEIVE_OFFLOAD
 	/* will only be present for data rx CE's */

hif/src/hif_exec.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2017-2018 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -20,7 +20,7 @@
 #define __HIF_EXEC_H__
 
 #include <hif.h>
-
+#include <linux/cpumask.h>
 
 struct hif_exec_context;
 
@@ -55,6 +55,7 @@ struct hif_exec_context {
 	uint32_t numirq;
 	uint32_t irq[HIF_MAX_GRP_IRQ];
 	uint32_t os_irq[HIF_MAX_GRP_IRQ];
+	cpumask_t cpumask;
 	uint32_t grp_id;
 	uint32_t scale_bin_shift;
 	const char *context_name;

hif/src/hif_irq_affinity.c

@@ -249,22 +249,21 @@ static int hncm_exec_migrate_to(struct qca_napi_data *napid, uint8_t ctx_id,
 	int rc = 0;
 	int status = 0;
 	int ind;
-	cpumask_t cpumask;
-
 
 	NAPI_DEBUG("-->%s(napi_cd=%d, didx=%d)", __func__, napi_ce, didx);
 
-	cpumask.bits[0] = (1 << didx);
 	exec_ctx = hif_exec_get_ctx(&napid->hif_softc->osc, ctx_id);
 	if (exec_ctx == NULL)
 		return -EINVAL;
 
+	exec_ctx->cpumask.bits[0] = (1 << didx);
+
 	for (ind = 0; ind < exec_ctx->numirq; ind++) {
 		if (exec_ctx->os_irq[ind]) {
 			irq_modify_status(exec_ctx->os_irq[ind],
 					  IRQ_NO_BALANCING, 0);
 			rc = irq_set_affinity_hint(exec_ctx->os_irq[ind],
-						   &cpumask);
+						   &exec_ctx->cpumask);
 			if (rc)
 				status = rc;
 		}

hif/src/hif_napi.c

@@ -814,7 +814,6 @@ bool hif_napi_correct_cpu(struct qca_napi_info *napi_info)
 {
 	bool right_cpu = true;
 	int rc = 0;
-	cpumask_t cpumask;
 	int cpu;
 	struct qca_napi_data *napid;
 	QDF_STATUS ret;
@@ -830,12 +829,12 @@ bool hif_napi_correct_cpu(struct qca_napi_info *napi_info)
 			right_cpu = false;
 
 			NAPI_DEBUG("interrupt on wrong CPU, correcting");
-			cpumask.bits[0] = (0x01 << napi_info->cpu);
+			napi_info->cpumask.bits[0] = (0x01 << napi_info->cpu);
 
 			irq_modify_status(napi_info->irq, IRQ_NO_BALANCING, 0);
 			ret = qdf_dev_set_irq_affinity(napi_info->irq,
 						       (struct qdf_cpu_mask *)
-						       &cpumask);
+						       &napi_info->cpumask);
 			rc = qdf_status_to_os_return(ret);
 			irq_modify_status(napi_info->irq, 0, IRQ_NO_BALANCING);
 
@@ -1472,18 +1471,19 @@ static int hncm_migrate_to(struct qca_napi_data *napid,
 			   int                   didx)
 {
 	int rc = 0;
-	cpumask_t cpumask;
 	QDF_STATUS status;
 
 	NAPI_DEBUG("-->%s(napi_cd=%d, didx=%d)", __func__, napi_ce, didx);
 
-	cpumask.bits[0] = (1 << didx);
 	if (!napid->napis[napi_ce])
 		return -EINVAL;
 
+	napid->napis[napi_ce]->cpumask.bits[0] = (1 << didx);
+
 	irq_modify_status(napid->napis[napi_ce]->irq, IRQ_NO_BALANCING, 0);
 	status = qdf_dev_set_irq_affinity(napid->napis[napi_ce]->irq,
-					  (struct qdf_cpu_mask *)&cpumask);
+					  (struct qdf_cpu_mask *)
+					  &napid->napis[napi_ce]->cpumask);
 	rc = qdf_status_to_os_return(status);
 
 	/* unmark the napis bitmap in the cpu table */