[v2 1/7] soc: qcom: llcc-slice: Add error checks for API functions

[Sharat Masetty]

From: Jordan Crouse <jcrouse at codeaurora.org>

llcc_slice_getd can return a ERR_PTR code on failure. Add a IS_ERR_OR_NULL
check to subsequent API calls that use struct llcc_slice_desc to guard
against faults and to let the leaf drivers get away with safely using a
ERR_PTR() encoded "pointer" in the aftermath of a llcc_slice_getd error.

Signed-off-by: Jordan Crouse <jcrouse at codeaurora.org>
Reviewed-by: Vivek Gautam <vivek.gautam at codeaurora.org>
---
 drivers/soc/qcom/llcc-slice.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
index d789267..6a03e4e 100644
--- a/drivers/soc/qcom/llcc-slice.c
+++ b/drivers/soc/qcom/llcc-slice.c
@@ -94,7 +94,8 @@ struct llcc_slice_desc *llcc_slice_getd(u32 uid)
  */
 void llcc_slice_putd(struct llcc_slice_desc *desc)
 {
-	kfree(desc);
+	if (!IS_ERR_OR_NULL(desc))
+		kfree(desc);
 }
 EXPORT_SYMBOL_GPL(llcc_slice_putd);
 
@@ -141,6 +142,9 @@ int llcc_slice_activate(struct llcc_slice_desc *desc)
 	int ret;
 	u32 act_ctrl_val;
 
+	if (IS_ERR_OR_NULL(desc))
+		return -EINVAL;
+
 	mutex_lock(&drv_data->lock);
 	if (test_bit(desc->slice_id, drv_data->bitmap)) {
 		mutex_unlock(&drv_data->lock);
@@ -175,6 +179,9 @@ int llcc_slice_deactivate(struct llcc_slice_desc *desc)
 	u32 act_ctrl_val;
 	int ret;
 
+	if (IS_ERR_OR_NULL(desc))
+		return -EINVAL;
+
 	mutex_lock(&drv_data->lock);
 	if (!test_bit(desc->slice_id, drv_data->bitmap)) {
 		mutex_unlock(&drv_data->lock);
@@ -202,6 +209,9 @@ int llcc_slice_deactivate(struct llcc_slice_desc *desc)
  */
 int llcc_get_slice_id(struct llcc_slice_desc *desc)
 {
+	if (IS_ERR_OR_NULL(desc))
+		return -EINVAL;
+
 	return desc->slice_id;
 }
 EXPORT_SYMBOL_GPL(llcc_get_slice_id);
@@ -212,6 +222,9 @@ int llcc_get_slice_id(struct llcc_slice_desc *desc)
  */
 size_t llcc_get_slice_size(struct llcc_slice_desc *desc)
 {
+	if (IS_ERR_OR_NULL(desc))
+		return 0;
+
 	return desc->slice_size;
 }
 EXPORT_SYMBOL_GPL(llcc_get_slice_size);
-- 
1.9.1