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>

3 files changed, 19 insertions, 14 deletions

diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 9c9d58617c98..7be2018ffbcc 100644
--- a/drivers/mtd/mtdoops.c
+++ b/drivers/mtd/mtdoops.c
@@ -222,8 +222,8 @@ static void mtdoops_write(struct mtdoops_context *cxt, int panic)
         hdr[1] = MTDOOPS_KERNMSG_MAGIC;
 
         if (panic)
-                ret = mtd->panic_write(mtd, cxt->nextpage * record_size,
-                                        record_size, &retlen, cxt->oops_buf);
+                ret = mtd_panic_write(mtd, cxt->nextpage * record_size,
+                                      record_size, &retlen, cxt->oops_buf);
         else
                 ret = mtd_write(mtd, cxt->nextpage * record_size,
                                 record_size, &retlen, cxt->oops_buf);
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 96574a036567..9ed58f7d7466 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -201,8 +201,8 @@ static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
                 len = 0;
         else if (to + len > mtd->size)
                 len = mtd->size - to;
-        return part->master->panic_write(part->master, to + part->offset,
-                                    len, retlen, buf);
+        return mtd_panic_write(part->master, to + part->offset, len, retlen,
+                               buf);
 }
 
 static int part_write_oob(struct mtd_info *mtd, loff_t to,
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;