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>

diff --git a/drivers/mtd/mtdoops.c b/drivers/mtd/mtdoops.c
index 9c9d586..7be2018 100644 (file)
--- 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 96574a0..9ed58f7 100644 (file)
--- 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 1da7f4a..2fb83cd 100644 (file)
--- 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;