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authormerge <null@invalid>2009-02-06 00:22:54 +0000
committerAndy Green <agreen@octopus.localdomain>2009-02-06 00:22:54 +0000
commitd1dcdf5718977c93805f9300b6c79f039db84c8b (patch)
tree58a161db6cf8953e33c1c9294a9c720a1aa0ad76 /fs/sysfs
parent9029dff1f370018665a6e2999632a34fd0518f4d (diff)
MERGE-via-pending-tracking-hist-MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011-1233879414-1233879505
pending-tracking-hist top was MERGE-via-stable-tracking-MERGE-via-mokopatches-tracking-MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011-1233879414-1233879505 / 1c405b6ccee468298e7ccbfd9a3a3f4d123207b0 ... parent commitmessage: From: merge <null@invalid> MERGE-via-stable-tracking-hist-MERGE-via-mokopatches-tracking-MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011-1233879414 stable-tracking-hist top was MERGE-via-mokopatches-tracking-MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011-1233879414 / 71be0a45396066b1f8f27f8f4f87937247a129e1 ... parent commitmessage: From: merge <null@invalid> MERGE-via-mokopatches-tracking-hist-MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011 mokopatches-tracking-hist top was MERGE-via-master-MERGE-via-master-hist-1232625318-1233879011 / 1be1b01373f572a02c6f1f99863c8c11ed2f9f5b ... parent commitmessage: From: merge <null@invalid> MERGE-via-master-MERGE-via-master-hist-1232625318 master top was MERGE-via-master-hist-1232625318 / dd4b117123ae66451695810017eb72fbdfc05df5 ... parent commitmessage: From: merge <null@invalid> MERGE-master-patchset-edits
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/Kconfig23
-rw-r--r--fs/sysfs/bin.c6
2 files changed, 29 insertions, 0 deletions
diff --git a/fs/sysfs/Kconfig b/fs/sysfs/Kconfig
new file mode 100644
index 00000000000..f4b67588b9d
--- /dev/null
+++ b/fs/sysfs/Kconfig
@@ -0,0 +1,23 @@
+config SYSFS
+ bool "sysfs file system support" if EMBEDDED
+ default y
+ help
+ The sysfs filesystem is a virtual filesystem that the kernel uses to
+ export internal kernel objects, their attributes, and their
+ relationships to one another.
+
+ Users can use sysfs to ascertain useful information about the running
+ kernel, such as the devices the kernel has discovered on each bus and
+ which driver each is bound to. sysfs can also be used to tune devices
+ and other kernel subsystems.
+
+ Some system agents rely on the information in sysfs to operate.
+ /sbin/hotplug uses device and object attributes in sysfs to assist in
+ delegating policy decisions, like persistently naming devices.
+
+ sysfs is currently used by the block subsystem to mount the root
+ partition. If sysfs is disabled you must specify the boot device on
+ the kernel boot command line via its major and minor numbers. For
+ example, "root=03:01" for /dev/hda1.
+
+ Designers of embedded systems may wish to say N here to conserve space.
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 66f6e58a7e4..f2c478c3424 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -63,6 +63,9 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
int count = min_t(size_t, bytes, PAGE_SIZE);
char *temp;
+ if (!bytes)
+ return 0;
+
if (size) {
if (offs > size)
return 0;
@@ -131,6 +134,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
int count = min_t(size_t, bytes, PAGE_SIZE);
char *temp;
+ if (!bytes)
+ return 0;
+
if (size) {
if (offs > size)
return 0;