Merge tag 'for-linus-20171120' of git://git.infradead.org/linux-mtd

Pull MTD updates from Richard Weinberger:
 "General changes:
   -  Unconfuse get_unmapped_area and point/unpoint driver methods
   -  New partition parser: sharpslpart
   -  Kill GENERIC_IO
   -  Various fixes

  NAND changes:
   -  Add a flag to mark NANDs that require 3 address cycles to encode a
      page address
   -  Set a default ECC/free layout when NAND_ECC_NONE is requested
   -  Fix a bug in panic_nand_write()
   -  Another batch of cleanups for the denali driver
   -  Fix PM support in the atmel driver
   -  Remove support for platform data in the omap driver
   -  Fix subpage write in the omap driver
   -  Fix irq handling in the mtk driver
   -  Change link order of mtk_ecc and mtk_nand drivers to speed up boot
      time
   -  Change log level of ECC error messages in the mxc driver
   -  Patch the pxa3xx driver to support Armada 8k platforms
   -  Add BAM DMA support to the qcom driver
   -  Convert gpio-nand to the GPIO desc API
   -  Fix ECC handling in the mt29f driver

  SPI-NOR changes:
   -  Introduce system power management support
   -  New mechanism to select the proper .quad_enable() hook by JEDEC
      ID, when needed, instead of only by manufacturer ID
   -  Add support to new memory parts from Gigadevice, Winbond, Macronix
      and Everspin
   -  Maintainance for Cadence, Intel, Mediatek and STM32 drivers"

*  tag 'for-linus-20171120' of git://git.infradead.org/linux-mtd: (85 commits)
  mtd: Avoid probe failures when mtd->dbg.dfs_dir is invalid
  mtd: sharpslpart: Add sharpslpart partition parser
  mtd: Add sanity checks in mtd_write/read_oob()
  mtd: remove the get_unmapped_area method
  mtd: implement mtd_get_unmapped_area() using the point method
  mtd: chips/map_rom.c: implement point and unpoint methods
  mtd: chips/map_ram.c: implement point and unpoint methods
  mtd: mtdram: properly handle the phys argument in the point method
  mtd: mtdswap: fix spelling mistake: 'TRESHOLD' -> 'THRESHOLD'
  mtd: slram: use memremap() instead of ioremap()
  kconfig: kill off GENERIC_IO option
  mtd: Fix C++ comment in include/linux/mtd/mtd.h
  mtd: constify mtd_partition
  mtd: plat-ram: Replace manual resource management by devm
  mtd: nand: Fix writing mtdoops to nand flash.
  mtd: intel-spi: Add Intel Lewisburg PCH SPI super SKU PCI ID
  mtd: nand: mtk: fix infinite ECC decode IRQ issue
  mtd: spi-nor: Add support for mr25h128
  mtd: nand: mtk: change the compile sequence of mtk_nand.o and mtk_ecc.o
  mtd: spi-nor: enable 4B opcodes for mx66l51235l
  ...

1 files changed, 56 insertions, 5 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index e7ea842ba3db..f80e911b8843 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -1022,11 +1022,18 @@ EXPORT_SYMBOL_GPL(mtd_unpoint);
 unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
 				    unsigned long offset, unsigned long flags)
 {
-	if (!mtd->_get_unmapped_area)
-		return -EOPNOTSUPP;
-	if (offset >= mtd->size || len > mtd->size - offset)
-		return -EINVAL;
-	return mtd->_get_unmapped_area(mtd, len, offset, flags);
+	size_t retlen;
+	void *virt;
+	int ret;
+
+	ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL);
+	if (ret)
+		return ret;
+	if (retlen != len) {
+		mtd_unpoint(mtd, offset, retlen);
+		return -ENOSYS;
+	}
+	return (unsigned long)virt;
 }
 EXPORT_SYMBOL_GPL(mtd_get_unmapped_area);
 
@@ -1093,6 +1100,39 @@ int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
 }
 EXPORT_SYMBOL_GPL(mtd_panic_write);
 
+static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs,
+			     struct mtd_oob_ops *ops)
+{
+	/*
+	 * Some users are setting ->datbuf or ->oobbuf to NULL, but are leaving
+	 * ->len or ->ooblen uninitialized. Force ->len and ->ooblen to 0 in
+	 *  this case.
+	 */
+	if (!ops->datbuf)
+		ops->len = 0;
+
+	if (!ops->oobbuf)
+		ops->ooblen = 0;
+
+	if (offs < 0 || offs + ops->len >= mtd->size)
+		return -EINVAL;
+
+	if (ops->ooblen) {
+		u64 maxooblen;
+
+		if (ops->ooboffs >= mtd_oobavail(mtd, ops))
+			return -EINVAL;
+
+		maxooblen = ((mtd_div_by_ws(mtd->size, mtd) -
+			      mtd_div_by_ws(offs, mtd)) *
+			     mtd_oobavail(mtd, ops)) - ops->ooboffs;
+		if (ops->ooblen > maxooblen)
+			return -EINVAL;
+	}
+
+	return 0;
+}
+
 int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 {
 	int ret_code;
@@ -1100,6 +1140,10 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
 	if (!mtd->_read_oob)
 		return -EOPNOTSUPP;
 
+	ret_code = mtd_check_oob_ops(mtd, from, ops);
+	if (ret_code)
+		return ret_code;
+
 	ledtrig_mtd_activity();
 	/*
 	 * In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics
@@ -1119,11 +1163,18 @@ EXPORT_SYMBOL_GPL(mtd_read_oob);
 int mtd_write_oob(struct mtd_info *mtd, loff_t to,
 				struct mtd_oob_ops *ops)
 {
+	int ret;
+
 	ops->retlen = ops->oobretlen = 0;
 	if (!mtd->_write_oob)
 		return -EOPNOTSUPP;
 	if (!(mtd->flags & MTD_WRITEABLE))
 		return -EROFS;
+
+	ret = mtd_check_oob_ops(mtd, to, ops);
+	if (ret)
+		return ret;
+
 	ledtrig_mtd_activity();
 	return mtd->_write_oob(mtd, to, ops);
 }