Merge tag 'mtd/for-4.17' of git://git.infradead.org/linux-mtd

Pull MTD updates from Boris Brezillon:
 "MTD Core:
   - Remove support for asynchronous erase (not implemented by any of
     the existing drivers anyway)
   - Remove Cyrille from the list of SPI NOR and MTD maintainers
   - Fix kernel doc headers
   - Allow users to define the partitions parsers they want to test
     through a DT property (compatible of the partitions subnode)
   - Remove the bfin-async-flash driver (the only architecture using it
     has been removed)
   - Fix pagetest test
   - Add extra checks in mtd_erase()
   - Simplify the MTD partition creation logic and get rid of
     mtd_add_device_partitions()

  MTD Drivers:
   - Add endianness information to the physmap DT binding
   - Add Eon EN29LV400A IDs to JEDEC probe logic
   - Use %*ph where appropriate

  SPI NOR Drivers:
   - Make fsl-quaspi assign different names to MTD devices connected to
     the same QSPI controller
   - Remove an unneeded driver.bus assigned in the fsl-qspi driver

  NAND Core:
   - Prepare arrival of the SPI NAND subsystem by implementing a generic
     (interface-agnostic) layer to ease manipulation of NAND devices
   - Move onenand code base to the drivers/mtd/nand/ dir
   - Rework timing mode selection
   - Provide a generic way for NAND chip drivers to flag a specific
     GET/SET FEATURE operation as supported/unsupported
   - Stop embedding ONFI/JEDEC param page in nand_chip

  NAND Drivers:
   - Rework/cleanup of the mxc driver
   - Various cleanups in the vf610 driver
   - Migrate the fsmc and vf610 to ->exec_op()
   - Get rid of the pxa driver (replaced by marvell_nand)
   - Support ->setup_data_interface() in the GPMI driver
   - Fix probe error path in several drivers
   - Remove support for unused hw_syndrome mode in sunxi_nand
   - Various minor improvements"

* tag 'mtd/for-4.17' of git://git.infradead.org/linux-mtd: (89 commits)
  dt-bindings: fsl-quadspi: Add the example of two SPI NOR
  mtd: fsl-quadspi: Distinguish the mtd device names
  mtd: nand: Fix some function description mismatches in core.c
  mtd: fsl-quadspi: Remove unneeded driver.bus assignment
  mtd: rawnand: marvell: Rename ->ecc_clk into ->core_clk
  mtd: rawnand: s3c2410: enhance the probe function error path
  mtd: rawnand: tango: fix probe function error path
  mtd: rawnand: sh_flctl: fix the probe function error path
  mtd: rawnand: omap2: fix the probe function error path
  mtd: rawnand: mxc: fix probe function error path
  mtd: rawnand: denali: fix probe function error path
  mtd: rawnand: davinci: fix probe function error path
  mtd: rawnand: cafe: fix probe function error path
  mtd: rawnand: brcmnand: fix probe function error path
  mtd: rawnand: sunxi: Stop supporting ECC_HW_SYNDROME mode
  mtd: rawnand: marvell: Fix clock resource by adding a register clock
  mtd: ftl: Use DIV_ROUND_UP()
  mtd: Fix some function description mismatches in mtdcore.c
  mtd: physmap_of: update struct map_info's swap as per map requirement
  dt-bindings: mtd-physmap: Add endianness supports
  ...

drivers/mtd/mtdchar.c

@@ -324,10 +324,6 @@ static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t c
     IOCTL calls for getting device parameters.
 
 ======================================================================*/
-static void mtdchar_erase_callback (struct erase_info *instr)
-{
-	wake_up((wait_queue_head_t *)instr->priv);
-}
 
 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
 {
@@ -709,11 +705,6 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 		if (!erase)
 			ret = -ENOMEM;
 		else {
-			wait_queue_head_t waitq;
-			DECLARE_WAITQUEUE(wait, current);
-
-			init_waitqueue_head(&waitq);
-
 			if (cmd == MEMERASE64) {
 				struct erase_info_user64 einfo64;
 
@@ -735,31 +726,8 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
 				erase->addr = einfo32.start;
 				erase->len = einfo32.length;
 			}
-			erase->mtd = mtd;
-			erase->callback = mtdchar_erase_callback;
-			erase->priv = (unsigned long)&waitq;
 
-			/*
-			  FIXME: Allow INTERRUPTIBLE. Which means
-			  not having the wait_queue head on the stack.
-
-			  If the wq_head is on the stack, and we
-			  leave because we got interrupted, then the
-			  wq_head is no longer there when the
-			  callback routine tries to wake us up.
-			*/
 			ret = mtd_erase(mtd, erase);
-			if (!ret) {
-				set_current_state(TASK_UNINTERRUPTIBLE);
-				add_wait_queue(&waitq, &wait);
-				if (erase->state != MTD_ERASE_DONE &&
-				    erase->state != MTD_ERASE_FAILED)
-					schedule();
-				remove_wait_queue(&waitq, &wait);
-				set_current_state(TASK_RUNNING);
-
-				ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
-			}
 			kfree(erase);
 		}
 		break;