mtd: introduce mtd_panic_write interface

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 15 insertions, 10 deletions

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 1da7f4a6ef88..2fb83cd3d264 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -186,6 +186,8 @@ struct mtd_info {
                      size_t *retlen, u_char *buf);
         int (*write) (struct mtd_info *mtd, loff_t to, size_t len,
                       size_t *retlen, const u_char *buf);
+        int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len,
+                            size_t *retlen, const u_char *buf);
 
         /* Backing device capabilities for this device
          * - provides mmap capabilities
@@ -193,16 +195,6 @@ struct mtd_info {
         struct backing_dev_info *backing_dev_info;
 
 
-
-        /* In blackbox flight recorder like scenarios we want to make successful
-           writes in interrupt context. panic_write() is only intended to be
-           called when its known the kernel is about to panic and we need the
-           write to succeed. Since the kernel is not going to be running for much
-           longer, this function can break locks and delay to ensure the write
-           succeeds (but not sleep). */
-
-        int (*panic_write) (struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen, const u_char *buf);
-
         int (*read_oob) (struct mtd_info *mtd, loff_t from,
                          struct mtd_oob_ops *ops);
         int (*write_oob) (struct mtd_info *mtd, loff_t to,
@@ -315,6 +307,19 @@ static inline int mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
         return mtd->write(mtd, to, len, retlen, buf);
 }
 
+/*
+ * In blackbox flight recorder like scenarios we want to make successful writes
+ * in interrupt context. panic_write() is only intended to be called when its
+ * known the kernel is about to panic and we need the write to succeed. Since
+ * the kernel is not going to be running for much longer, this function can
+ * break locks and delay to ensure the write succeeds (but not sleep).
+ */
+static inline int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
+                                  size_t *retlen, const u_char *buf)
+{
+        return mtd->panic_write(mtd, to, len, retlen, buf);
+}
+
 static inline struct mtd_info *dev_to_mtd(struct device *dev)
 {
         return dev ? dev_get_drvdata(dev) : NULL;