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authorStefan Nickl <Stefan.Nickl@kontron.com>2005-09-05 01:57:46 -0500
committerDmitry Torokhov <dtor_core@ameritech.net>2005-09-05 01:57:46 -0500
commit010988e888a0abbe7118635c1b33d049caae6b29 (patch)
tree064ebbc4e054bb19bb685475bcc07be21d6a1b76 /drivers/usb/input
parent7d25258f69cedc2f2e55eb25ba2e2078060b44f4 (diff)
Input: HIDDEV - make HIDIOCSREPORT wait IO completion
When trying to make the hiddev driver issue several Set_Report control transfers to a custom device with 2.6.13-rc6, only the first transfer in a row is carried out, while others immediately following it are silently dropped. This happens where hid_submit_report() (in hid-core.c) tests for HID_CTRL_RUNNING, which seems to be still set because the first transfer is not finished yet. As a workaround, inserting a delay between the two calls to ioctl(HIDIOCSREPORT) in userspace "solves" the problem. The straightforward fix is to add a call to hid_wait_io() to the implementation of HIDIOCSREPORT (in hiddev.c), just like for HIDIOCGREPORT. Works fine for me. Apparently, this issue has some history: http://marc.theaimsgroup.com/?l=linux-usb-users&m=111100670105558&w=2 Signed-off-by: Stefan Nickl <Stefan.Nickl@kontron.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Vojtech Pavlik <vojtech@suse.cz> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/usb/input')
-rw-r--r--drivers/usb/input/hiddev.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/input/hiddev.c b/drivers/usb/input/hiddev.c
index 4c13331b5f4..d32427818af 100644
--- a/drivers/usb/input/hiddev.c
+++ b/drivers/usb/input/hiddev.c
@@ -507,6 +507,7 @@ static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd
return -EINVAL;
hid_submit_report(hid, report, USB_DIR_OUT);
+ hid_wait_io(hid);
return 0;