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authorJulia Lawall <julia@diku.dk>2009-06-27 09:55:32 +0200
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-06-27 09:22:10 +0100
commit70ec3bb8ea3f8c55b255f41d122c7d4d8c0d00b4 (patch)
tree8d61fcbd6d49c8dde71426513b6945dd147935b5
parent89bb871e96cdc3d78b7f69f0bacc94b21bbaccfd (diff)
mtd: Use BLOCK_NIL consistently in NFTL/INFTL
Use BLOCK_NIL consistently rather than sometimes 0xffff and sometimes BLOCK_NIL. The semantic patch that finds this issue is below (http://www.emn.fr/x-info/coccinelle/). On the other hand, the changes were made by hand, in part because drivers/mtd/inftlcore.c contains dead code that causes spatch to ignore a relevant function. Specifically, the function INFTL_findwriteunit contains a do-while loop, but always takes a return that leaves the loop on the first iteration. // <smpl> @r exists@ identifier f,C; @@ f(...) { ... return C; } @s@ identifier r.C; expression E; @@ @@ identifier r.f,r.C,I; expression s.E; @@ f(...) { <... ( I | - E + C ) ...> } // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/mtd/inftlcore.c11
-rw-r--r--drivers/mtd/nftlcore.c16
2 files changed, 14 insertions, 13 deletions
diff --git a/drivers/mtd/inftlcore.c b/drivers/mtd/inftlcore.c
index 73f0522..d8cf29c 100644
--- a/drivers/mtd/inftlcore.c
+++ b/drivers/mtd/inftlcore.c
@@ -226,7 +226,7 @@ static u16 INFTL_findfreeblock(struct INFTLrecord *inftl, int desperate)
if (!desperate && inftl->numfreeEUNs < 2) {
DEBUG(MTD_DEBUG_LEVEL1, "INFTL: there are too few free "
"EUNs (%d)\n", inftl->numfreeEUNs);
- return 0xffff;
+ return BLOCK_NIL;
}
/* Scan for a free block */
@@ -281,7 +281,8 @@ static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned
silly = MAX_LOOPS;
while (thisEUN < inftl->nb_blocks) {
for (block = 0; block < inftl->EraseSize/SECTORSIZE; block ++) {
- if ((BlockMap[block] != 0xffff) || BlockDeleted[block])
+ if ((BlockMap[block] != BLOCK_NIL) ||
+ BlockDeleted[block])
continue;
if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize)
@@ -525,7 +526,7 @@ static inline u16 INFTL_findwriteunit(struct INFTLrecord *inftl, unsigned block)
if (!silly--) {
printk(KERN_WARNING "INFTL: infinite loop in "
"Virtual Unit Chain 0x%x\n", thisVUC);
- return 0xffff;
+ return BLOCK_NIL;
}
/* Skip to next block in chain */
@@ -549,7 +550,7 @@ hitused:
* waiting to be picked up. We're going to have to fold
* a chain to make room.
*/
- thisEUN = INFTL_makefreeblock(inftl, 0xffff);
+ thisEUN = INFTL_makefreeblock(inftl, BLOCK_NIL);
/*
* Hopefully we free something, lets try again.
@@ -631,7 +632,7 @@ hitused:
printk(KERN_WARNING "INFTL: error folding to make room for Virtual "
"Unit Chain 0x%x\n", thisVUC);
- return 0xffff;
+ return BLOCK_NIL;
}
/*
diff --git a/drivers/mtd/nftlcore.c b/drivers/mtd/nftlcore.c
index e3f8495..fb86cac 100644
--- a/drivers/mtd/nftlcore.c
+++ b/drivers/mtd/nftlcore.c
@@ -208,7 +208,7 @@ static u16 NFTL_findfreeblock(struct NFTLrecord *nftl, int desperate )
/* Normally, we force a fold to happen before we run out of free blocks completely */
if (!desperate && nftl->numfreeEUNs < 2) {
DEBUG(MTD_DEBUG_LEVEL1, "NFTL_findfreeblock: there are too few free EUNs\n");
- return 0xffff;
+ return BLOCK_NIL;
}
/* Scan for a free block */
@@ -230,11 +230,11 @@ static u16 NFTL_findfreeblock(struct NFTLrecord *nftl, int desperate )
printk("Argh! No free blocks found! LastFreeEUN = %d, "
"FirstEUN = %d\n", nftl->LastFreeEUN,
le16_to_cpu(nftl->MediaHdr.FirstPhysicalEUN));
- return 0xffff;
+ return BLOCK_NIL;
}
} while (pot != nftl->LastFreeEUN);
- return 0xffff;
+ return BLOCK_NIL;
}
static u16 NFTL_foldchain (struct NFTLrecord *nftl, unsigned thisVUC, unsigned pendingblock )
@@ -431,7 +431,7 @@ static u16 NFTL_foldchain (struct NFTLrecord *nftl, unsigned thisVUC, unsigned p
/* add the header so that it is now a valid chain */
oob.u.a.VirtUnitNum = oob.u.a.SpareVirtUnitNum = cpu_to_le16(thisVUC);
- oob.u.a.ReplUnitNum = oob.u.a.SpareReplUnitNum = 0xffff;
+ oob.u.a.ReplUnitNum = oob.u.a.SpareReplUnitNum = BLOCK_NIL;
nftl_write_oob(mtd, (nftl->EraseSize * targetEUN) + 8,
8, &retlen, (char *)&oob.u);
@@ -515,7 +515,7 @@ static u16 NFTL_makefreeblock( struct NFTLrecord *nftl , unsigned pendingblock)
if (ChainLength < 2) {
printk(KERN_WARNING "No Virtual Unit Chains available for folding. "
"Failing request\n");
- return 0xffff;
+ return BLOCK_NIL;
}
return NFTL_foldchain (nftl, LongestChain, pendingblock);
@@ -578,7 +578,7 @@ static inline u16 NFTL_findwriteunit(struct NFTLrecord *nftl, unsigned block)
printk(KERN_WARNING
"Infinite loop in Virtual Unit Chain 0x%x\n",
thisVUC);
- return 0xffff;
+ return BLOCK_NIL;
}
/* Skip to next block in chain */
@@ -601,7 +601,7 @@ static inline u16 NFTL_findwriteunit(struct NFTLrecord *nftl, unsigned block)
//u16 startEUN = nftl->EUNtable[thisVUC];
//printk("Write to VirtualUnitChain %d, calling makefreeblock()\n", thisVUC);
- writeEUN = NFTL_makefreeblock(nftl, 0xffff);
+ writeEUN = NFTL_makefreeblock(nftl, BLOCK_NIL);
if (writeEUN == BLOCK_NIL) {
/* OK, we accept that the above comment is
@@ -673,7 +673,7 @@ static inline u16 NFTL_findwriteunit(struct NFTLrecord *nftl, unsigned block)
printk(KERN_WARNING "Error folding to make room for Virtual Unit Chain 0x%x\n",
thisVUC);
- return 0xffff;
+ return BLOCK_NIL;
}
static int nftl_writeblock(struct mtd_blktrans_dev *mbd, unsigned long block,