linux-kernel - [PATCH 4.9 015/118] floppy: check_events callback should not return a negative number

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Message-Id: <20190322111217.072059325@linuxfoundation.org>
Date:   Fri, 22 Mar 2019 12:14:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Yufen Yu <yuyufen@...wei.com>, Jens Axboe <axboe@...nel.dk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 015/118] floppy: check_events callback should not return a negative number

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

[ 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@...cle.com>
Fixes: a0c80efe5956 ("floppy: fix lock_fdc() signal handling")
Signed-off-by: Yufen Yu <yuyufen@...wei.com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/floppy.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 326b9ba4518e..6914c6e1e1a8 100644
--- 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();
 	}
-- 
2.19.1