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| author | Andrew Morton <akpm@linux-foundation.org> | 2008-03-05 02:09:07 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-03-25 08:33:49 +0300 |
| commit | 815d2d50da41f28aae58f5e9b3c61c3094422749 (patch) | |
| tree | f5c3a8f1cd676ef7ed76ea6cc96ccf399310f7fb | |
| parent | c9698d6b1a90929e427a165bd8283f803f57d9bd (diff) | |
| download | linux-815d2d50da41f28aae58f5e9b3c61c3094422749.tar.xz | |
driver core: debug for bad dev_attr_show() return value.
Try to find the culprit who caused
http://bugzilla.kernel.org/show_bug.cgi?id=10150
Cc: <balajirrao@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/base/core.c | 5 | ||||
| -rw-r--r-- | fs/sysfs/file.c | 8 |
2 files changed, 12 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 7de543d1d0b4..24198ad01976 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -19,6 +19,7 @@ #include <linux/kdev_t.h> #include <linux/notifier.h> #include <linux/genhd.h> +#include <linux/kallsyms.h> #include <asm/semaphore.h> #include "base.h" @@ -68,6 +69,10 @@ static ssize_t dev_attr_show(struct kobject *kobj, struct attribute *attr, if (dev_attr->show) ret = dev_attr->show(dev, dev_attr, buf); + if (ret >= (ssize_t)PAGE_SIZE) { + print_symbol("dev_attr_show: %s returned bad count\n", + (unsigned long)dev_attr->show); + } return ret; } diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index a271c87c4472..baa663e69388 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -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; |