1 files changed, 54 insertions, 17 deletions

diff --git a/drivers/soc/qcom/llcc-slice.c b/drivers/soc/qcom/llcc-slice.c
index 80667f7be52c..8390bc006a31 100644
--- a/drivers/soc/qcom/llcc-slice.c
+++ b/drivers/soc/qcom/llcc-slice.c
@@ -46,7 +46,7 @@
 
 #define BANK_OFFSET_STRIDE            0x80000
 
-static struct llcc_drv_data *drv_data;
+static struct llcc_drv_data *drv_data = (void *) -EPROBE_DEFER;
 
 static const struct regmap_config llcc_regmap_config = {
         .reg_bits = 32,
@@ -68,6 +68,9 @@ struct llcc_slice_desc *llcc_slice_getd(u32 uid)
         struct llcc_slice_desc *desc;
         u32 sz, count;
 
+        if (IS_ERR(drv_data))
+                return ERR_CAST(drv_data);
+
         cfg = drv_data->cfg;
         sz = drv_data->cfg_size;
 
@@ -108,6 +111,9 @@ static int llcc_update_act_ctrl(u32 sid,
         u32 slice_status;
         int ret;
 
+        if (IS_ERR(drv_data))
+                return PTR_ERR(drv_data);
+
         act_ctrl_reg = LLCC_TRP_ACT_CTRLn(sid);
         status_reg = LLCC_TRP_STATUSn(sid);
 
@@ -143,6 +149,9 @@ int llcc_slice_activate(struct llcc_slice_desc *desc)
         int ret;
         u32 act_ctrl_val;
 
+        If (IS_ERR(drv_data))
+                return PTR_ERR(drv_data);
+
         if (IS_ERR_OR_NULL(desc))
                 return -EINVAL;
 
@@ -180,6 +189,9 @@ int llcc_slice_deactivate(struct llcc_slice_desc *desc)
         u32 act_ctrl_val;
         int ret;
 
+        If (IS_ERR(drv_data))
+                return PTR_ERR(drv_data);
+
         if (IS_ERR_OR_NULL(desc))
                 return -EINVAL;
 
@@ -289,6 +301,14 @@ static int qcom_llcc_cfg_program(struct platform_device *pdev)
         return ret;
 }
 
+int qcom_llcc_remove(struct platform_device *pdev)
+{
+        /* Set the global pointer to a error code to avoid referencing it */
+        drv_data = ERR_PTR(-ENODEV);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_llcc_remove);
+
 int qcom_llcc_probe(struct platform_device *pdev,
                       const struct llcc_slice_config *llcc_cfg, u32 sz)
 {
@@ -300,35 +320,45 @@ int qcom_llcc_probe(struct platform_device *pdev,
         struct platform_device *llcc_edac;
 
         drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
-        if (!drv_data)
-                return -ENOMEM;
+        if (!drv_data) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
         llcc_banks_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                                         "llcc_base");
         llcc_banks_base = devm_ioremap_resource(&pdev->dev, llcc_banks_res);
-        if (IS_ERR(llcc_banks_base))
-                return PTR_ERR(llcc_banks_base);
+        if (IS_ERR(llcc_banks_base)) {
+                ret = PTR_ERR(llcc_banks_base);
+                goto err;
+        }
 
         drv_data->regmap = devm_regmap_init_mmio(dev, llcc_banks_base,
                                                 &llcc_regmap_config);
-        if (IS_ERR(drv_data->regmap))
-                return PTR_ERR(drv_data->regmap);
+        if (IS_ERR(drv_data->regmap)) {
+                ret = PTR_ERR(drv_data->regmap);
+                goto err;
+        }
 
         llcc_bcast_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                                         "llcc_broadcast_base");
         llcc_bcast_base = devm_ioremap_resource(&pdev->dev, llcc_bcast_res);
-        if (IS_ERR(llcc_bcast_base))
-                return PTR_ERR(llcc_bcast_base);
+        if (IS_ERR(llcc_bcast_base)) {
+                ret = PTR_ERR(llcc_bcast_base);
+                goto err;
+        }
 
         drv_data->bcast_regmap = devm_regmap_init_mmio(dev, llcc_bcast_base,
                                                         &llcc_regmap_config);
-        if (IS_ERR(drv_data->bcast_regmap))
-                return PTR_ERR(drv_data->bcast_regmap);
+        if (IS_ERR(drv_data->bcast_regmap)) {
+                ret = PTR_ERR(drv_data->bcast_regmap);
+                goto err;
+        }
 
         ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
                                                 &num_banks);
         if (ret)
-                return ret;
+                goto err;
 
         num_banks &= LLCC_LB_CNT_MASK;
         num_banks >>= LLCC_LB_CNT_SHIFT;
@@ -340,8 +370,10 @@ int qcom_llcc_probe(struct platform_device *pdev,
 
         drv_data->offsets = devm_kcalloc(dev, num_banks, sizeof(u32),
                                                         GFP_KERNEL);
-        if (!drv_data->offsets)
-                return -ENOMEM;
+        if (!drv_data->offsets) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
         for (i = 0; i < num_banks; i++)
                 drv_data->offsets[i] = i * BANK_OFFSET_STRIDE;
@@ -349,8 +381,10 @@ int qcom_llcc_probe(struct platform_device *pdev,
         drv_data->bitmap = devm_kcalloc(dev,
         BITS_TO_LONGS(drv_data->max_slices), sizeof(unsigned long),
                                                 GFP_KERNEL);
-        if (!drv_data->bitmap)
-                return -ENOMEM;
+        if (!drv_data->bitmap) {
+                ret = -ENOMEM;
+                goto err;
+        }
 
         drv_data->cfg = llcc_cfg;
         drv_data->cfg_size = sz;
@@ -359,7 +393,7 @@ int qcom_llcc_probe(struct platform_device *pdev,
 
         ret = qcom_llcc_cfg_program(pdev);
         if (ret)
-                return ret;
+                goto err;
 
         drv_data->ecc_irq = platform_get_irq(pdev, 0);
         if (drv_data->ecc_irq >= 0) {
@@ -370,6 +404,9 @@ int qcom_llcc_probe(struct platform_device *pdev,
                         dev_err(dev, "Failed to register llcc edac driver\n");
         }
 
+        return 0;
+err:
+        drv_data = ERR_PTR(-ENODEV);
         return ret;
 }
 EXPORT_SYMBOL_GPL(qcom_llcc_probe);