[PATCH v3 3/6] rtc: zynqmp: check calibration max value

[Tomas Melin]

Enable check to not overflow the calibration
max value.

Reviewed-by: Harini T <harini.t at amd.com>
Tested-by: Harini T <harini.t at amd.com>
Signed-off-by: Tomas Melin <tomas.melin at vaisala.com>
---
 drivers/rtc/rtc-zynqmp.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/rtc/rtc-zynqmp.c b/drivers/rtc/rtc-zynqmp.c
index 856bc1678e7d31144f320ae9f75fc58c742a2a64..caacce3725e2ef3803ea42d40e77ceaeb7d7b914 100644
--- a/drivers/rtc/rtc-zynqmp.c
+++ b/drivers/rtc/rtc-zynqmp.c
@@ -349,6 +349,11 @@ static int xlnx_rtc_probe(struct platform_device *pdev)
 		xrtcdev->freq--;
 	}
 
+	if (xrtcdev->freq > RTC_TICK_MASK) {
+		dev_err(&pdev->dev, "Invalid RTC calibration value\n");
+		return -EINVAL;
+	}
+
 	ret = readl(xrtcdev->reg_base + RTC_CALIB_RD);
 	if (!ret)
 		writel(xrtcdev->freq, (xrtcdev->reg_base + RTC_CALIB_WR));

-- 
2.47.3