iommu/omap: Make pagetable debugfs entry read-only

Remove the writeability on the 'pagetable' debugfs entry,
so that the mapping/unmapping into an OMAP IOMMU is only
limited to actual client devices/drivers at kernel-level.

Signed-off-by: Suman Anna <s-anna@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 2 insertions, 46 deletions

diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index a520438182db..28de657e38c0 100644
--- a/drivers/iommu/omap-iommu-debug.c
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -24,8 +24,6 @@
 #include "omap-iopgtable.h"
 #include "omap-iommu.h"
 
-#define MAXCOLUMN 100 /* for short messages */
-
 static DEFINE_MUTEX(iommu_debug_lock);
 
 static struct dentry *iommu_debug_root;
@@ -82,39 +80,6 @@ static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
         return bytes;
 }
 
-static ssize_t debug_write_pagetable(struct file *file,
-                     const char __user *userbuf, size_t count, loff_t *ppos)
-{
-        struct iotlb_entry e;
-        struct cr_regs cr;
-        int err;
-        struct device *dev = file->private_data;
-        struct omap_iommu *obj = dev_to_omap_iommu(dev);
-        char buf[MAXCOLUMN], *p = buf;
-
-        count = min(count, sizeof(buf));
-
-        mutex_lock(&iommu_debug_lock);
-        if (copy_from_user(p, userbuf, count)) {
-                mutex_unlock(&iommu_debug_lock);
-                return -EFAULT;
-        }
-
-        sscanf(p, "%x %x", &cr.cam, &cr.ram);
-        if (!cr.cam || !cr.ram) {
-                mutex_unlock(&iommu_debug_lock);
-                return -EINVAL;
-        }
-
-        omap_iotlb_cr_to_e(&cr, &e);
-        err = omap_iopgtable_store_entry(obj, &e);
-        if (err)
-                dev_err(obj->dev, "%s: fail to store cr\n", __func__);
-
-        mutex_unlock(&iommu_debug_lock);
-        return count;
-}
-
 #define dump_ioptable_entry_one(lv, da, val)                    \
         ({                                                      \
                 int __err = 0;                                  \
@@ -202,14 +167,6 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
         return bytes;
 }
 
-#define DEBUG_FOPS(name)                                                \
-        static const struct file_operations debug_##name##_fops = {     \
-                .open = simple_open,                                    \
-                .read = debug_read_##name,                              \
-                .write = debug_write_##name,                            \
-                .llseek = generic_file_llseek,                          \
-        };
-
 #define DEBUG_FOPS_RO(name)                                             \
         static const struct file_operations debug_##name##_fops = {     \
                 .open = simple_open,                                    \
@@ -219,7 +176,7 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,
 
 DEBUG_FOPS_RO(regs);
 DEBUG_FOPS_RO(tlb);
-DEBUG_FOPS(pagetable);
+DEBUG_FOPS_RO(pagetable);
 
 #define __DEBUG_ADD_FILE(attr, mode)                                    \
         {                                                               \
@@ -230,7 +187,6 @@ DEBUG_FOPS(pagetable);
                         return -ENOMEM;                                 \
         }
 
-#define DEBUG_ADD_FILE(name) __DEBUG_ADD_FILE(name, 0600)
 #define DEBUG_ADD_FILE_RO(name) __DEBUG_ADD_FILE(name, 0400)
 
 static int iommu_debug_register(struct device *dev, void *data)
@@ -263,7 +219,7 @@ static int iommu_debug_register(struct device *dev, void *data)
 
         DEBUG_ADD_FILE_RO(regs);
         DEBUG_ADD_FILE_RO(tlb);
-        DEBUG_ADD_FILE(pagetable);
+        DEBUG_ADD_FILE_RO(pagetable);
 
         return 0;