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driver core: debug for bad dev_attr_show() return value.

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Try to find the culprit who caused
http://bugzilla.kernel.org/show_bug.cgi?id=10150

Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Andrew Morton 2008-03-04 15:09:07 -08:00 • committed by Greg Kroah-Hartman
commit 815d2d50da
2 changed files with 12 additions and 1 deletions
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8
fs/sysfs/file.c
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@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/kallsyms.h>
#include <linux/namei.h>
#include <linux/poll.h>
#include <linux/list.h>
@ -86,7 +87,12 @@ static int fill_read_buffer(struct dentry * dentry, struct sysfs_buffer * buffer
* The code works fine with PAGE_SIZE return but it's likely to
* indicate truncated result or overflow in normal use cases.
*/
BUG_ON(count >= (ssize_t)PAGE_SIZE);
if (count >= (ssize_t)PAGE_SIZE) {
print_symbol("fill_read_buffer: %s returned bad count\n",
(unsigned long)ops->show);
/* Try to struggle along */
count = PAGE_SIZE - 1;
}
if (count >= 0) {
buffer->needs_read_fill = 0;
buffer->count = count;