uio: Fix return value of poll

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@jaguarmicro.com>
Link: https://lore.kernel.org/r/20241126124259.1367-1-angus.chen@jaguarmicro.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 004a549c6c7d42c1ac12bfea9fd4c99f3868369e..d93ed4e86a174b5bad193a61aa522cd833fe7bb5 100644 (file)
--- 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)