Blackfin arch: handle case of d_path() returning error in decode_address()

d_path() can return an error.  Most of its callers do something or other to
make up something sane in that case.  Do similar for blackfin's
decode_address() call to d_path().

Signed-off-by: Tim Pepper <lnxninja@linux.vnet.ibm.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 5 insertions, 2 deletions

diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index 1aa2c788e228..0003616d02a2 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -147,9 +147,12 @@ static void decode_address(char *buf, unsigned long address)
                                 char *name = p->comm;
                                 struct file *file = vma->vm_file;
 
-                                if (file)
-                                        name = d_path(&file->f_path, _tmpbuf,
+                                if (file) {
+                                        char *d_name = d_path(&file->f_path, _tmpbuf,
                                                       sizeof(_tmpbuf));
+                                        if (!IS_ERR(d_name))
+                                                name = d_name;
+                                }
 
                                 /* FLAT does not have its text aligned to the start of
                                  * the map while FDPIC ELF does ...