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[MTD] [INFTL] Fix infinite loop in INFTL_foldchain 

When iterating over a chain in reverse (oldest block first), this
patch correctly marks the PUtable[] entry of the second to last erase
block of a chain as BLOCK_NIL, regardless of whether or not it can
format the last block successfully. Before, the second to last block
was only marked as pointing to BLOCK_NIL if INFTL_formatblock()
succeeded on the last block of the chain, which could potentially
result in an infinite loop if the block was worn out and refused to
format.

Signed-off-by: Daniel Rosenthal <danielrosenthal@acm.org>
Acked-by: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Daniel Rosenthal 2008-10-05 17:43:10 -04:00 committed by David Woodhouse
parent f324277cf7
commit 63fd7f30f3
1 changed files with 4 additions and 1 deletions
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5
drivers/mtd/inftlcore.c
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@ -388,6 +388,10 @@ static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned
if (thisEUN == targetEUN)
break;
/* Unlink the last block from the chain. */
inftl->PUtable[prevEUN] = BLOCK_NIL;
/* Now try to erase it. */
if (INFTL_formatblock(inftl, thisEUN) < 0) {
/*
* Could not erase : mark block as reserved.
@ -396,7 +400,6 @@ static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned
} else {
/* Correctly erased : mark it as free */
inftl->PUtable[thisEUN] = BLOCK_FREE;
inftl->PUtable[prevEUN] = BLOCK_NIL;
inftl->numfreeEUNs++;
}
}