linux-kernel - [PATCH 4.19 175/206] drm/qxl: Use correct notify port address when creating cursor ring

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Message-Id: <20200623195325.637864990@linuxfoundation.org>
Date:   Tue, 23 Jun 2020 21:58:23 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
        Gerd Hoffmann <kraxel@...hat.com>
Subject: [PATCH 4.19 175/206] drm/qxl: Use correct notify port address when creating cursor ring

From: Huacai Chen <chenhc@...ote.com>

commit 80e5f89da3ab949fbbf1cae01dfaea29f5483a75 upstream.

The command ring and cursor ring use different notify port addresses
definition: QXL_IO_NOTIFY_CMD and QXL_IO_NOTIFY_CURSOR. However, in
qxl_device_init() we use QXL_IO_NOTIFY_CMD to create both command ring
and cursor ring. This doesn't cause any problems now, because QEMU's
behaviors on QXL_IO_NOTIFY_CMD and QXL_IO_NOTIFY_CURSOR are the same.
However, QEMU's behavior may be change in future, so let's fix it.

P.S.: In the X.org QXL driver, the notify port address of cursor ring
      is correct.

Signed-off-by: Huacai Chen <chenhc@...ote.com>
Cc: <stable@...r.kernel.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1585635488-17507-1-git-send-email-chenhc@lemote.com
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/qxl/qxl_kms.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/qxl/qxl_kms.c
+++ b/drivers/gpu/drm/qxl/qxl_kms.c
@@ -181,7 +181,7 @@ int qxl_device_init(struct qxl_device *q
 				&(qdev->ram_header->cursor_ring_hdr),
 				sizeof(struct qxl_command),
 				QXL_CURSOR_RING_SIZE,
-				qdev->io_base + QXL_IO_NOTIFY_CMD,
+				qdev->io_base + QXL_IO_NOTIFY_CURSOR,
 				false,
 				&qdev->cursor_event);