[PATCH] uio: Fix return value of poll

[Angus Chen]

The return type of __poll_t can't be negative,
-EIO will be translate to __poll_t,and will return to caller.

Fixes: beafc54c4e2f ("UIO: Add the User IO core code")
Signed-off-by: Angus Chen <angus.chen@xxxxxxxxxxxxxxx>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 004a549c6c7d..d93ed4e86a17 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -565,7 +565,7 @@ static __poll_t uio_poll(struct file *filep, poll_table *wait)
 
 	mutex_lock(&idev->info_lock);
 	if (!idev->info || !idev->info->irq)
-		ret = -EIO;
+		ret = EPOLLERR;
 	mutex_unlock(&idev->info_lock);
 
 	if (ret)
-- 
2.34.1