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[PATCH] HID read busywait fix
author
Micon, David
<DMicon@pelco.com>
Sat, 20 May 2006 21:59:59 +0000
(14:59 -0700)
committer
Linus Torvalds
<torvalds@g5.osdl.org>
Sun, 21 May 2006 19:59:17 +0000
(12:59 -0700)
Make a read of a HID device block until data is available. Without it, the
read goes into a busy-wait loop until data is available.
Cc: Greg KH <greg@kroah.com>
Acked-by: Vojtech Pavlik <vojtech@suse.cz>
Cc: Dmitry Torokhov <dtor_core@ameritech.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
drivers/usb/input/hiddev.c
patch
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diff --git
a/drivers/usb/input/hiddev.c
b/drivers/usb/input/hiddev.c
index
6dd6666
..
c4670e1
100644
(file)
--- a/
drivers/usb/input/hiddev.c
+++ b/
drivers/usb/input/hiddev.c
@@
-317,6
+317,7
@@
static ssize_t hiddev_read(struct file * file, char __user * buffer, size_t coun
}
schedule();
+ set_current_state(TASK_INTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);