dmaengine: idxd: remove trailing white space on input str for wq name

Add string processing with strim() in order to remove trailing white spaces
that may be input by user for the wq->name.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164789525123.2799661.13795829125221129132.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/idxd/sysfs.c

@@ -832,6 +832,7 @@ static ssize_t wq_name_store(struct device *dev,
 			     size_t count)
 {
 	struct idxd_wq *wq = confdev_to_wq(dev);
+	char *input, *pos;
 
 	if (wq->state != IDXD_WQ_DISABLED)
 		return -EPERM;
@@ -846,9 +847,14 @@ static ssize_t wq_name_store(struct device *dev,
 	if (wq->type == IDXD_WQT_KERNEL && device_pasid_enabled(wq->idxd))
 		return -EOPNOTSUPP;
 
+	input = kstrndup(buf, count, GFP_KERNEL);
+	if (!input)
+		return -ENOMEM;
+
+	pos = strim(input);
 	memset(wq->name, 0, WQ_NAME_SIZE + 1);
-	strncpy(wq->name, buf, WQ_NAME_SIZE);
-	strreplace(wq->name, '\n', '\0');
+	sprintf(wq->name, "%s", pos);
+	kfree(input);
 	return count;
 }