qcacmn: SSR protect the pktlog_fops functions

Protect pktlog_fops callback function from sub system restart.

Change-Id: Iaaa50f609a96058e5f1a669f88c97e4a97193562
CRs-Fixed: 2131028

utils/pktlog/linux_ac.c

@@ -551,7 +551,7 @@ static void pktlog_detach(struct ol_txrx_pdev_t *handle)
 	}
 }
 
-static int pktlog_open(struct inode *i, struct file *f)
+static int __pktlog_open(struct inode *i, struct file *f)
 {
 	struct hif_opaque_softc *scn;
 	struct ol_pktlog_dev_t *pl_dev;
@@ -573,6 +573,11 @@ static int pktlog_open(struct inode *i, struct file *f)
 		return -EBUSY;
 	}
 
+	if (cds_is_load_or_unload_in_progress() || cds_is_driver_recovering()) {
+		pr_info("%s: Load/Unload or recovery is in progress", __func__);
+		return -EAGAIN;
+	}
+
 	pl_info->curr_pkt_state = PKTLOG_OPR_IN_PROGRESS_READ_START;
 	scn = cds_get_context(QDF_MODULE_ID_HIF);
 	if (!scn) {
@@ -608,7 +613,18 @@ static int pktlog_open(struct inode *i, struct file *f)
 	return ret;
 }
 
-static int pktlog_release(struct inode *i, struct file *f)
+static int pktlog_open(struct inode *i, struct file *f)
+{
+	int ret;
+
+	cds_ssr_protect(__func__);
+	ret = __pktlog_open(i, f);
+	cds_ssr_unprotect(__func__);
+
+	return ret;
+}
+
+static int __pktlog_release(struct inode *i, struct file *f)
 {
 	struct hif_opaque_softc *scn;
 	struct ol_pktlog_dev_t *pl_dev;
@@ -623,6 +639,11 @@ static int pktlog_release(struct inode *i, struct file *f)
 	if (!pl_info)
 		return -EINVAL;
 
+	if (cds_is_load_or_unload_in_progress() || cds_is_driver_recovering()) {
+		pr_info("%s: Load/Unload or recovery is in progress", __func__);
+		return -EAGAIN;
+	}
+
 	scn = cds_get_context(QDF_MODULE_ID_HIF);
 	if (!scn) {
 		pl_info->curr_pkt_state = PKTLOG_OPR_NOT_IN_PROGRESS;
@@ -658,6 +679,17 @@ static int pktlog_release(struct inode *i, struct file *f)
 	return ret;
 }
 
+static int pktlog_release(struct inode *i, struct file *f)
+{
+	int ret;
+
+	cds_ssr_protect(__func__);
+	ret = __pktlog_release(i, f);
+	cds_ssr_unprotect(__func__);
+
+	return ret;
+}
+
 #ifndef MIN
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #endif
@@ -828,6 +860,11 @@ __pktlog_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
 	struct ath_pktlog_info *pl_info;
 	struct ath_pktlog_buf *log_buf;
 
+	if (cds_is_load_or_unload_in_progress() || cds_is_driver_recovering()) {
+		pr_info("%s: Load/Unload or recovery is in progress", __func__);
+		return -EAGAIN;
+	}
+
 	pl_info = (struct ath_pktlog_info *)
 					PDE_DATA(file->f_path.dentry->d_inode);
 	if (!pl_info)
@@ -970,9 +1007,12 @@ pktlog_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
 					PDE_DATA(file->f_path.dentry->d_inode);
 	if (!pl_info)
 		return 0;
+
+	cds_ssr_protect(__func__);
 	mutex_lock(&pl_info->pktlog_mutex);
 	ret = __pktlog_read(file, buf, nbytes, ppos);
 	mutex_unlock(&pl_info->pktlog_mutex);
+	cds_ssr_unprotect(__func__);
 	return ret;
 }
 
@@ -1037,7 +1077,7 @@ static struct vm_operations_struct pktlog_vmops = {
 	fault:pktlog_fault,
 };
 
-static int pktlog_mmap(struct file *file, struct vm_area_struct *vma)
+static int __pktlog_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct ath_pktlog_info *pl_info;
 
@@ -1054,12 +1094,28 @@ static int pktlog_mmap(struct file *file, struct vm_area_struct *vma)
 		return -ENOMEM;
 	}
 
+	if (cds_is_load_or_unload_in_progress() || cds_is_driver_recovering()) {
+		pr_info("%s: Load/Unload or recovery is in progress", __func__);
+		return -EAGAIN;
+	}
+
 	vma->vm_flags |= VM_LOCKED;
 	vma->vm_ops = &pktlog_vmops;
 	pktlog_vopen(vma);
 	return 0;
 }
 
+static int pktlog_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	int ret;
+
+	cds_ssr_protect(__func__);
+	ret = __pktlog_mmap(file, vma);
+	cds_ssr_unprotect(__func__);
+
+	return ret;
+}
+
 int pktlogmod_init(void *context)
 {
 	int ret;