mtd: Add flag to indicate panic_write

Added a flag to indicate a panic_write so that low level drivers can
use it to take required action where applicable, to ensure oops data
gets written to assigned mtd device.

Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 453242d..408615f 100644 (file)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1124,6 +1124,9 @@ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
                return -EROFS;
        if (!len)
                return 0;
+       if (!mtd->oops_panic_write)
+               mtd->oops_panic_write = true;
+
        return mtd->_panic_write(mtd, to, len, retlen, buf);
 }
 EXPORT_SYMBOL_GPL(mtd_panic_write);

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 936a3fd..4ca8c1c 100644 (file)
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -316,6 +316,12 @@ struct mtd_info {
        int (*_get_device) (struct mtd_info *mtd);
        void (*_put_device) (struct mtd_info *mtd);
 
+       /*
+        * flag indicates a panic write, low level drivers can take appropriate
+        * action if required to ensure writes go through
+        */
+       bool oops_panic_write;
+
        struct notifier_block reboot_notifier;  /* default mode before reboot */
 
        /* ECC status information */