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authorMarcel Holtmann <marcel@holtmann.org>2019-12-04 03:37:13 +0100
committerJiri Kosina <jkosina@suse.cz>2019-12-09 13:52:29 +0100
commit9f3b61dc1dd7b81e99e7ed23776bb64a35f39e1a (patch)
treeb1e01892843c58872676c7c06a20bc7b85d3344a /drivers
parentd004701d1cc5a036b1f2dec34dd5973064c72eab (diff)
HID: hidraw: Fix returning EPOLLOUT from hidraw_poll
When polling a connected /dev/hidrawX device, it is useful to get the EPOLLOUT when writing is possible. Since writing is possible as soon as the device is connected, always return it. Right now EPOLLOUT is only returned when there are also input reports are available. This works if devices start sending reports when connected, but some HID devices might need an output report first before sending any input reports. This change will allow using EPOLLOUT here as well. Fixes: 378b80370aa1 ("hidraw: Return EPOLLOUT from hidraw_poll") Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Cc: stable@vger.kernel.org Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hid/hidraw.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index c3fc0ceb8096..f61f2123a755 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -252,10 +252,10 @@ static __poll_t hidraw_poll(struct file *file, poll_table *wait)
poll_wait(file, &list->hidraw->wait, wait);
if (list->head != list->tail)
- return EPOLLIN | EPOLLRDNORM | EPOLLOUT;
+ return EPOLLIN | EPOLLRDNORM;
if (!list->hidraw->exist)
return EPOLLERR | EPOLLHUP;
- return 0;
+ return EPOLLOUT | EPOLLWRNORM;
}
static int hidraw_open(struct inode *inode, struct file *file)