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 fdabd0b74492d25cdf872e6461f32458605aeaf8..a8de56f1936db166919c6bb1afa0c0e910be3a43 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4084,7 +4084,7 @@ 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();
        }