linux-kernel - [PATCH] drm/bochs: Fix the ID mismatch error

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Date:   Thu, 21 Feb 2019 00:33:03 +0000
From:   Alistair Francis <Alistair.Francis@....com>
To:     "kraxel@...hat.com" <kraxel@...hat.com>,
        "virtualization@...ts.linux-foundation.org" 
        <virtualization@...ts.linux-foundation.org>
CC:     "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "alistair23@...il.com" <alistair23@...il.com>,
        "david.abdurachmanov@...il.com" <david.abdurachmanov@...il.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        Alistair Francis <Alistair.Francis@....com>
Subject: [PATCH] drm/bochs: Fix the ID mismatch error

When running RISC-V QEMU with the Bochs device attached via PCIe the
probe of the Bochs device fails with:
    [drm:bochs_hw_init] *ERROR* ID mismatch

This was introduced by this commit:
    7780eb9ce8 bochs: convert to drm_dev_register

To fix the error we ensure that pci_enable_device() is called before
bochs_load().

Signed-off-by: Alistair Francis <alistair.francis@....com>
Reported-by: David Abdurachmanov <david.abdurachmanov@...il.com>
---
 drivers/gpu/drm/bochs/bochs_drv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/bochs/bochs_drv.c b/drivers/gpu/drm/bochs/bochs_drv.c
index f3dd66ae990a..aa35007262cd 100644
--- a/drivers/gpu/drm/bochs/bochs_drv.c
+++ b/drivers/gpu/drm/bochs/bochs_drv.c
@@ -154,6 +154,10 @@ static int bochs_pci_probe(struct pci_dev *pdev,
 	if (IS_ERR(dev))
 		return PTR_ERR(dev);
 
+	ret = pci_enable_device(pdev);
+	if (ret)
+		goto err_free_dev;
+
 	dev->pdev = pdev;
 	pci_set_drvdata(pdev, dev);
 
-- 
2.20.1