floppy: check_events callback should not return a negative number

[ Upstream commit 96d7cb932e826219ec41ac02e5af037ffae6098c ]

floppy_check_events() is supposed to return bit flags to say which
events occured. We should return zero to say that no event flags are
set.  Only BIT(0) and BIT(1) are used in the caller. And .check_events
interface also expect to return an unsigned int value.

However, after commit a0c80efe5956, it may return -EINTR (-4u).
Here, both BIT(0) and BIT(1) are cleared. So this patch shouldn't
affect runtime, but it obviously is still worth fixing.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: a0c80efe5956 ("floppy: fix lock_fdc() signal handling")
Signed-off-by: Yufen Yu <yuyufen@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 326b9ba4518ec987ff027b732b0b833da10f8187..6914c6e1e1a803d8fe87d08e47e9e498ddbdf909 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -3752,7 +3752,7 @@ static unsigned int floppy_check_events(struct gendisk *disk,
 
        if (time_after(jiffies, UDRS->last_checked + UDP->checkfreq)) {
                if (lock_fdc(drive))
-                       return -EINTR;
+                       return 0;
                poll_drive(false, 0);
                process_fd_request();
        }