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authorBjorn Helgaas <bjorn.helgaas@hp.com>2008-07-31 00:07:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-08-01 12:46:41 -0700
commitea44c1d60df3640bd956a67c392865c44fe9bc45 (patch)
treea419febccc84cf70c36704f1a444c2c34bda05d7
parent61a2d07d3fb1ac34d142b9b62d4cd60a0f8c229e (diff)
PNP: fix formatting of dbg_pnp_show_resources() output
Each resource should be printed on its own line, so start snprintf'ing at the beginning of the buffer every time through the loop. Also, use scnprintf() rather than snprintf() when building up the buffer to print. scnprintf() returns the number of characters actually written into the buffer (not including the trailing NULL). snprintf() returns the number of characters that *would be* written, assuming everything would fit in the buffer. That's nice if we want to resize the buffer to make sure everything fits, but in this case, I just want to keep from overflowing the buffer, and it's OK if the output is truncated. Using snprintf() meant that my "len" could grow to be more than the the buffer size, which makes "sizeof(buf) - len" negative, which causes this alarming WARN_ON: http://marc.info/?l=linux-kernel&m=121736480005656&w=2 More useful snprintf/scnprintf discussion: http://lwn.net/Articles/69419/ Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Reported-by: Pete Clements <clem@clem.clem-digital.net> Cc: Rene Herman <rene.herman@keyaccess.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/pnp/support.c96
1 files changed, 49 insertions, 47 deletions
diff --git a/drivers/pnp/support.c b/drivers/pnp/support.c
index bbf78ef4ba0..b42df162071 100644
--- a/drivers/pnp/support.c
+++ b/drivers/pnp/support.c
@@ -77,7 +77,7 @@ void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
{
#ifdef DEBUG
char buf[128];
- int len = 0;
+ int len;
struct pnp_resource *pnp_res;
struct resource *res;
@@ -89,9 +89,10 @@ void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
dev_dbg(&dev->dev, "%s: current resources:\n", desc);
list_for_each_entry(pnp_res, &dev->resources, list) {
res = &pnp_res->res;
+ len = 0;
- len += snprintf(buf + len, sizeof(buf) - len, " %-3s ",
- pnp_resource_type_name(res));
+ len += scnprintf(buf + len, sizeof(buf) - len, " %-3s ",
+ pnp_resource_type_name(res));
if (res->flags & IORESOURCE_DISABLED) {
dev_dbg(&dev->dev, "%sdisabled\n", buf);
@@ -101,18 +102,18 @@ void dbg_pnp_show_resources(struct pnp_dev *dev, char *desc)
switch (pnp_resource_type(res)) {
case IORESOURCE_IO:
case IORESOURCE_MEM:
- len += snprintf(buf + len, sizeof(buf) - len,
- "%#llx-%#llx flags %#lx",
- (unsigned long long) res->start,
- (unsigned long long) res->end,
- res->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ "%#llx-%#llx flags %#lx",
+ (unsigned long long) res->start,
+ (unsigned long long) res->end,
+ res->flags);
break;
case IORESOURCE_IRQ:
case IORESOURCE_DMA:
- len += snprintf(buf + len, sizeof(buf) - len,
- "%lld flags %#lx",
- (unsigned long long) res->start,
- res->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ "%lld flags %#lx",
+ (unsigned long long) res->start,
+ res->flags);
break;
}
dev_dbg(&dev->dev, "%s\n", buf);
@@ -144,66 +145,67 @@ void dbg_pnp_show_option(struct pnp_dev *dev, struct pnp_option *option)
struct pnp_dma *dma;
if (pnp_option_is_dependent(option))
- len += snprintf(buf + len, sizeof(buf) - len,
- " dependent set %d (%s) ",
- pnp_option_set(option),
- pnp_option_priority_name(option));
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " dependent set %d (%s) ",
+ pnp_option_set(option),
+ pnp_option_priority_name(option));
else
- len += snprintf(buf + len, sizeof(buf) - len, " independent ");
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " independent ");
switch (option->type) {
case IORESOURCE_IO:
port = &option->u.port;
- len += snprintf(buf + len, sizeof(buf) - len, "io min %#llx "
- "max %#llx align %lld size %lld flags %#x",
- (unsigned long long) port->min,
- (unsigned long long) port->max,
- (unsigned long long) port->align,
- (unsigned long long) port->size, port->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len, "io min %#llx "
+ "max %#llx align %lld size %lld flags %#x",
+ (unsigned long long) port->min,
+ (unsigned long long) port->max,
+ (unsigned long long) port->align,
+ (unsigned long long) port->size, port->flags);
break;
case IORESOURCE_MEM:
mem = &option->u.mem;
- len += snprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
- "max %#llx align %lld size %lld flags %#x",
- (unsigned long long) mem->min,
- (unsigned long long) mem->max,
- (unsigned long long) mem->align,
- (unsigned long long) mem->size, mem->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len, "mem min %#llx "
+ "max %#llx align %lld size %lld flags %#x",
+ (unsigned long long) mem->min,
+ (unsigned long long) mem->max,
+ (unsigned long long) mem->align,
+ (unsigned long long) mem->size, mem->flags);
break;
case IORESOURCE_IRQ:
irq = &option->u.irq;
- len += snprintf(buf + len, sizeof(buf) - len, "irq");
+ len += scnprintf(buf + len, sizeof(buf) - len, "irq");
if (bitmap_empty(irq->map.bits, PNP_IRQ_NR))
- len += snprintf(buf + len, sizeof(buf) - len,
- " <none>");
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " <none>");
else {
for (i = 0; i < PNP_IRQ_NR; i++)
if (test_bit(i, irq->map.bits))
- len += snprintf(buf + len,
- sizeof(buf) - len,
- " %d", i);
+ len += scnprintf(buf + len,
+ sizeof(buf) - len,
+ " %d", i);
}
- len += snprintf(buf + len, sizeof(buf) - len, " flags %#x",
- irq->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len, " flags %#x",
+ irq->flags);
if (irq->flags & IORESOURCE_IRQ_OPTIONAL)
- len += snprintf(buf + len, sizeof(buf) - len,
- " (optional)");
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " (optional)");
break;
case IORESOURCE_DMA:
dma = &option->u.dma;
- len += snprintf(buf + len, sizeof(buf) - len, "dma");
+ len += scnprintf(buf + len, sizeof(buf) - len, "dma");
if (!dma->map)
- len += snprintf(buf + len, sizeof(buf) - len,
- " <none>");
+ len += scnprintf(buf + len, sizeof(buf) - len,
+ " <none>");
else {
for (i = 0; i < 8; i++)
if (dma->map & (1 << i))
- len += snprintf(buf + len,
- sizeof(buf) - len,
- " %d", i);
+ len += scnprintf(buf + len,
+ sizeof(buf) - len,
+ " %d", i);
}
- len += snprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
- "flags %#x", dma->map, dma->flags);
+ len += scnprintf(buf + len, sizeof(buf) - len, " (bitmask %#x) "
+ "flags %#x", dma->map, dma->flags);
break;
}
dev_dbg(&dev->dev, "%s\n", buf);