linux-kernel - [PATCH] fbdev: sm712fb: handle ioremap() errors in probe

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Date:   Mon, 13 Jul 2020 11:05:32 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     Evgeny Novikov <novikov@...ras.ru>,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] fbdev: sm712fb: handle ioremap() errors in probe

smtcfb_pci_probe() does not handle ioremap() errors for case 0x720. The
patch fixes that exactly like for case 0x710/2.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
---
 drivers/video/fbdev/sm712fb.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c
index 6a1b4a853d9e..0171b23fa211 100644
--- a/drivers/video/fbdev/sm712fb.c
+++ b/drivers/video/fbdev/sm712fb.c
@@ -1602,6 +1602,14 @@ static int smtcfb_pci_probe(struct pci_dev *pdev,
 		sfb->fb->fix.mmio_start = mmio_base;
 		sfb->fb->fix.mmio_len = 0x00200000;
 		sfb->dp_regs = ioremap(mmio_base, 0x00200000 + smem_size);
+		if (!sfb->dp_regs) {
+			dev_err(&pdev->dev,
+				"%s: unable to map memory mapped IO!\n",
+				sfb->fb->fix.id);
+			err = -ENOMEM;
+			goto failed_fb;
+		}
+
 		sfb->lfb = sfb->dp_regs + 0x00200000;
 		sfb->mmio = (smtc_regbaseaddress =
 		    sfb->dp_regs + 0x000c0000);
-- 
2.16.4