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ARM: PL08x: use 'size_t' for lengths

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Use size_t for variables denoting lengths throughout, and use the 'z'
qualifier for printing the value.  For safety, add a BUG_ON() in
pl08x_fill_lli_for_desc() to catch the remainder potentially becoming
negative.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Russell King - ARM Linux 2011-01-03 22:37:31 +00:00 committed by Dan Williams
parent 56b618820c
commit cace658572
2 changed files with 19 additions and 25 deletions
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40
drivers/dma/amba-pl08x.c
View File

@ -342,7 +342,7 @@ static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan)
struct pl08x_txd *txdi = NULL; struct pl08x_txd *txdi = NULL;
struct pl08x_txd *txd; struct pl08x_txd *txd;
unsigned long flags; unsigned long flags;
u32 bytes = 0; size_t bytes = 0;
spin_lock_irqsave(&plchan->lock, flags); spin_lock_irqsave(&plchan->lock, flags);
@ -470,7 +470,7 @@ static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded)
} }
static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth,
u32 tsize) size_t tsize)
{ {
u32 retbits = cctl; u32 retbits = cctl;
@ -583,6 +583,8 @@ static int pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x,
if (cctl & PL080_CONTROL_DST_INCR) if (cctl & PL080_CONTROL_DST_INCR)
txd->dstbus.addr += len; txd->dstbus.addr += len;
BUG_ON(*remainder < len);
*remainder -= len; *remainder -= len;
return num_llis + 1; return num_llis + 1;
@ -591,7 +593,7 @@ static int pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x,
/* /*
* Return number of bytes to fill to boundary, or len * Return number of bytes to fill to boundary, or len
*/ */
static inline u32 pl08x_pre_boundary(u32 addr, u32 len) static inline size_t pl08x_pre_boundary(u32 addr, size_t len)
{ {
u32 boundary; u32 boundary;
@ -614,11 +616,11 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
{ {
struct pl08x_channel_data *cd = txd->cd; struct pl08x_channel_data *cd = txd->cd;
struct pl08x_bus_data *mbus, *sbus; struct pl08x_bus_data *mbus, *sbus;
u32 remainder; size_t remainder;
int num_llis = 0; int num_llis = 0;
u32 cctl; u32 cctl;
int max_bytes_per_lli; size_t max_bytes_per_lli;
int total_bytes = 0; size_t total_bytes = 0;
struct pl08x_lli *llis_va; struct pl08x_lli *llis_va;
txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT,
@ -686,13 +688,13 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
max_bytes_per_lli = min(txd->srcbus.buswidth, txd->dstbus.buswidth) * max_bytes_per_lli = min(txd->srcbus.buswidth, txd->dstbus.buswidth) *
PL080_CONTROL_TRANSFER_SIZE_MASK; PL080_CONTROL_TRANSFER_SIZE_MASK;
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s max bytes per lli = %d\n", "%s max bytes per lli = %zu\n",
__func__, max_bytes_per_lli); __func__, max_bytes_per_lli);
/* We need to count this down to zero */ /* We need to count this down to zero */
remainder = txd->len; remainder = txd->len;
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s remainder = %d\n", "%s remainder = %zu\n",
__func__, remainder); __func__, remainder);
/* /*
@ -760,9 +762,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
* width left * width left
*/ */
while (remainder > (mbus->buswidth - 1)) { while (remainder > (mbus->buswidth - 1)) {
int lli_len, target_len; size_t lli_len, target_len, tsize, odd_bytes;
int tsize;
int odd_bytes;
/* /*
* If enough left try to send max possible, * If enough left try to send max possible,
@ -805,7 +805,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
if (lli_len <= 0) { if (lli_len <= 0) {
dev_err(&pl08x->adev->dev, dev_err(&pl08x->adev->dev,
"%s lli_len is %d, <= 0\n", "%s lli_len is %zu, <= 0\n",
__func__, lli_len); __func__, lli_len);
return 0; return 0;
} }
@ -853,7 +853,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
if (target_len != lli_len) { if (target_len != lli_len) {
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s can't send what we want. Desired 0x%08x, lli of 0x%08x bytes in txd of 0x%08x\n", "%s can't send what we want. Desired 0x%08zx, lli of 0x%08zx bytes in txd of 0x%08zx\n",
__func__, target_len, lli_len, txd->len); __func__, target_len, lli_len, txd->len);
} }
@ -863,7 +863,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
tsize); tsize);
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s fill lli with single lli chunk of size 0x%08x (remainder 0x%08x)\n", "%s fill lli with single lli chunk of size 0x%08zx (remainder 0x%08zx)\n",
__func__, lli_len, remainder); __func__, lli_len, remainder);
num_llis = pl08x_fill_lli_for_desc(pl08x, txd, num_llis = pl08x_fill_lli_for_desc(pl08x, txd,
num_llis, lli_len, cctl, num_llis, lli_len, cctl,
@ -882,7 +882,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
&& (remainder); j++) { && (remainder); j++) {
cctl = pl08x_cctl_bits(cctl, 1, 1, 1); cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s align with boundary, single byte (remain 0x%08x)\n", "%s align with boundary, single byte (remain 0x%08zx)\n",
__func__, remainder); __func__, remainder);
num_llis = num_llis =
pl08x_fill_lli_for_desc(pl08x, pl08x_fill_lli_for_desc(pl08x,
@ -896,16 +896,10 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
/* /*
* Send any odd bytes * Send any odd bytes
*/ */
if (remainder < 0) {
dev_err(&pl08x->adev->dev, "%s remainder not fitted 0x%08x bytes\n",
__func__, remainder);
return 0;
}
while (remainder) { while (remainder) {
cctl = pl08x_cctl_bits(cctl, 1, 1, 1); cctl = pl08x_cctl_bits(cctl, 1, 1, 1);
dev_vdbg(&pl08x->adev->dev, dev_vdbg(&pl08x->adev->dev,
"%s align with boundary, single odd byte (remain %d)\n", "%s align with boundary, single odd byte (remain %zu)\n",
__func__, remainder); __func__, remainder);
num_llis = pl08x_fill_lli_for_desc(pl08x, txd, num_llis, num_llis = pl08x_fill_lli_for_desc(pl08x, txd, num_llis,
1, cctl, &remainder); 1, cctl, &remainder);
@ -914,7 +908,7 @@ static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x,
} }
if (total_bytes != txd->len) { if (total_bytes != txd->len) {
dev_err(&pl08x->adev->dev, dev_err(&pl08x->adev->dev,
"%s size of encoded lli:s don't match total txd, transferred 0x%08x from size 0x%08x\n", "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n",
__func__, total_bytes, txd->len); __func__, total_bytes, txd->len);
return 0; return 0;
} }

4
include/linux/amba/pl08x.h
View File

@ -77,7 +77,7 @@ struct pl08x_bus_data {
dma_addr_t addr; dma_addr_t addr;
u8 maxwidth; u8 maxwidth;
u8 buswidth; u8 buswidth;
u32 fill_bytes; size_t fill_bytes;
}; };
/** /**
@ -113,7 +113,7 @@ struct pl08x_txd {
enum dma_data_direction direction; enum dma_data_direction direction;
struct pl08x_bus_data srcbus; struct pl08x_bus_data srcbus;
struct pl08x_bus_data dstbus; struct pl08x_bus_data dstbus;
int len; size_t len;
dma_addr_t llis_bus; dma_addr_t llis_bus;
void *llis_va; void *llis_va;
struct pl08x_channel_data *cd; struct pl08x_channel_data *cd;