target/linux/generic/pending-4.9/460-mtd-cfi_cmdset_0002-no-erase_suspend.patch

   1 From: Felix Fietkau <nbd@nbd.name>
   2 Subject: kernel: disable cfi cmdset 0002 erase suspend
   3
   4 on some platforms, erase suspend leads to data corruption and lockups when write
   5 ops collide with erase ops. this has been observed on the buffalo wzr-hp-g300nh.
   6 rather than play whack-a-mole with a hard to reproduce issue on a variety of devices,
   7 simply disable erase suspend, as it will usually not produce any useful gain on
   8 the small filesystems used on embedded hardware.
   9
  10 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  11 ---
  12  drivers/mtd/chips/cfi_cmdset_0002.c | 2 +-
  13  1 file changed, 1 insertion(+), 1 deletion(-)
  14
  15 diff --git a/drivers/mtd/chips/cfi_cmdset_0002.c b/drivers/mtd/chips/cfi_cmdset_0002.c
  16 index 9dca881bb378..ea4db1917334 100644
  17 --- a/drivers/mtd/chips/cfi_cmdset_0002.c
  18 +++ b/drivers/mtd/chips/cfi_cmdset_0002.c
  19 @@ -807,7 +807,7 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
  20                 return 0;
  21
  22         case FL_ERASING:
  23 -               if (!cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
  24 +               if (1 /* no suspend */ || !cfip || !(cfip->EraseSuspend & (0x1|0x2)) ||
  25                     !(mode == FL_READY || mode == FL_POINT ||
  26                     (mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
  27                         goto sleep;
  28 --
  29 2.11.0
  30