mtd: Add a function to report when the MTD dev list has been updated

We need to parse mtdparts/mtids again everytime a device has been
added/removed from the MTD list, but there's currently no way to know
when such an update has been done.

Add an ->updated field to the idr struct that we set to true every time
a device is added/removed and expose a function returning the value
of this field and resetting it to false.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Tested-by: Heiko Schocher <hs@denx.de>

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index fb6c779..7a15ded 100644 (file)
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -87,14 +87,17 @@ struct idr_layer {
 
 struct idr {
        struct idr_layer id[MAX_IDR_ID];
+       bool updated;
 };
 
 #define DEFINE_IDR(name)       struct idr name;
 
 void idr_remove(struct idr *idp, int id)
 {
-       if (idp->id[id].used)
+       if (idp->id[id].used) {
                idp->id[id].used = 0;
+               idp->updated = true;
+       }
 
        return;
 }
@@ -134,6 +137,7 @@ int idr_alloc(struct idr *idp, void *ptr, int start, int end, gfp_t gfp_mask)
                if (idl->used == 0) {
                        idl->used = 1;
                        idl->ptr = ptr;
+                       idp->updated = true;
                        return i;
                }
                i++;
@@ -155,6 +159,16 @@ struct mtd_info *__mtd_next_device(int i)
 }
 EXPORT_SYMBOL_GPL(__mtd_next_device);
 
+bool mtd_dev_list_updated(void)
+{
+       if (mtd_idr.updated) {
+               mtd_idr.updated = false;
+               return true;
+       }
+
+       return false;
+}
+
 #ifndef __UBOOT__
 static LIST_HEAD(mtd_notifiers);
 

diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index 68e5915..d20ebd8 100644 (file)
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -581,6 +581,7 @@ int mtd_arg_off_size(int argc, char *const argv[], int *idx, loff_t *off,
 void mtd_get_len_incl_bad(struct mtd_info *mtd, uint64_t offset,
                          const uint64_t length, uint64_t *len_incl_bad,
                          int *truncated);
+bool mtd_dev_list_updated(void);
 
 /* drivers/mtd/mtd_uboot.c */
 int mtd_search_alternate_name(const char *mtdname, char *altname,