pstore: fix one type of return value in pstore

the return type of function _read_ in pstore is size_t,
but in the callback function of _read_, the logic doesn't
consider it too much, which means if negative value (assuming
error here) is returned, it will be converted to positive because
of type casting. ssize_t is enough for this function.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index f835a25625f..912403c2a93 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -152,7 +152,7 @@ EXPORT_SYMBOL_GPL(pstore_register);
 void pstore_get_records(void)
 {
         struct pstore_info *psi = psinfo;
-        size_t                  size;
+        ssize_t                 size;
         u64                     id;
         enum pstore_type_id     type;
         struct timespec         time;
@@ -163,7 +163,7 @@ void pstore_get_records(void)
 
         mutex_lock(&psinfo->buf_mutex);
         while ((size = psi->read(&id, &type, &time)) > 0) {
-                if (pstore_mkfile(type, psi->name, id, psi->buf, size,
+                if (pstore_mkfile(type, psi->name, id, psi->buf, (size_t)size,
                                   time, psi->erase))
                         failed++;
         }