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Date: Mon, 24 Mar 2008 23:16:54 -0700 From: Greg Kroah-Hartman <gregkh@...e.de> To: linux-kernel@...r.kernel.org Cc: Andrew Morton <akpm@...ux-foundation.org>, <balajirrao@...il.com>, Greg Kroah-Hartman <gregkh@...e.de> Subject: [PATCH 2/2] driver core: debug for bad dev_attr_show() return value. From: Andrew Morton <akpm@...ux-foundation.org> Try to find the culprit who caused http://bugzilla.kernel.org/show_bug.cgi?id=10150 Cc: <balajirrao@...il.com> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- drivers/base/core.c | 5 +++++ 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 7de543d..24198ad 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 a271c87..baa663e 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; -- 1.5.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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