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mtd: cfi: cmdset_0002: Do not allow read/write to suspend erase block.

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Currently it is possible to read and/or write to suspend EB's.
Writing /dev/mtdX or /dev/mtdblockX from several processes may
break the flash state machine.

Taken from cfi_cmdset_0001 driver.

Signed-off-by: Joakim Tjernlund <[email protected]>
Cc: <[email protected]>
Reviewed-by: Richard Weinberger <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>
This commit is contained in:
Joakim Tjernlund 2018-03-01 14:39:41 +01:00 • committed by Boris Brezillon
commit 7b70eb1439
1 changed files with 6 additions and 3 deletions
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9
drivers/mtd/chips/cfi_cmdset_0002.c
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@ -816,9 +816,10 @@ static int get_chip(struct map_info *map, struct flchip *chip, unsigned long adr
(mode == FL_WRITING && (cfip->EraseSuspend & 0x2))))
goto sleep;
/* We could check to see if we're trying to access the sector
* that is currently being erased. However, no user will try
* anything like that so we just wait for the timeout. */
/* Do not allow suspend iff read/write to EB address */
if ((adr & chip->in_progress_block_mask) ==
chip->in_progress_block_addr)
goto sleep;
/* Erase suspend */
/* It's harmless to issue the Erase-Suspend and Erase-Resume
@ -2267,6 +2268,7 @@ static int __xipram do_erase_chip(struct map_info *map, struct flchip *chip)
chip->state = FL_ERASING;
chip->erase_suspended = 0;
chip->in_progress_block_addr = adr;
chip->in_progress_block_mask = ~(map->size - 1);
INVALIDATE_CACHE_UDELAY(map, chip,
adr, map->size,
@ -2356,6 +2358,7 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
chip->state = FL_ERASING;
chip->erase_suspended = 0;
chip->in_progress_block_addr = adr;
chip->in_progress_block_mask = ~(len - 1);
INVALIDATE_CACHE_UDELAY(map, chip,
adr, len,