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HID: hidraw, uhid: Always report EPOLLOUT

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[ Upstream commit 9e635c2851df6caee651e589fbf937b637973c91 ]

hidraw and uhid device nodes are always available for writing so we should
always report EPOLLOUT and EPOLLWRNORM bits, not only in the cases when
there is nothing to read.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Fixes: be54e7461ffdc ("HID: uhid: Fix returning EPOLLOUT from uhid_char_poll")
Fixes: 9f3b61dc1dd7b ("HID: hidraw: Fix returning EPOLLOUT from hidraw_poll")
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jiri Kosina 2020-01-10 15:32:51 +01:00 committed by Greg Kroah-Hartman
parent b62df58cd6
commit 30db8e400c
2 changed files with 7 additions and 5 deletions
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7
drivers/hid/hidraw.c
View file

@ -257,13 +257,14 @@ static ssize_t hidraw_get_report(struct file *file, char __user *buffer, size_t
static __poll_t hidraw_poll(struct file *file, poll_table *wait)
{
struct hidraw_list *list = file->private_data;
__poll_t mask = EPOLLOUT | EPOLLWRNORM; /* hidraw is always writable */
poll_wait(file, &list->hidraw->wait, wait);
if (list->head != list->tail)
return EPOLLIN | EPOLLRDNORM;
mask |= EPOLLIN | EPOLLRDNORM;
if (!list->hidraw->exist)
return EPOLLERR | EPOLLHUP;
return EPOLLOUT | EPOLLWRNORM;
mask |= EPOLLERR | EPOLLHUP;
return mask;
}
static int hidraw_open(struct inode *inode, struct file *file)

5
drivers/hid/uhid.c
View file

@ -769,13 +769,14 @@ static ssize_t uhid_char_write(struct file *file, const char __user *buffer,
static __poll_t uhid_char_poll(struct file *file, poll_table *wait)
{
struct uhid_device *uhid = file->private_data;
__poll_t mask = EPOLLOUT | EPOLLWRNORM; /* uhid is always writable */
poll_wait(file, &uhid->waitq, wait);
if (uhid->head != uhid->tail)
return EPOLLIN | EPOLLRDNORM;
mask |= EPOLLIN | EPOLLRDNORM;
return EPOLLOUT | EPOLLWRNORM;
return mask;
}
static const struct file_operations uhid_fops = {