From 815d2d50da41f28aae58f5e9b3c61c3094422749 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Tue, 4 Mar 2008 15:09:07 -0800 Subject: [PATCH] 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: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 5 +++++ fs/sysfs/file.c | 8 +++++++- 2 files changed, 12 insertions(+), 1 deletion(-) 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 #include #include +#include #include #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 #include +#include #include #include #include @@ -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; -- 2.20.1