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https://abf.rosa.ru/djam/kernel-5.15.git
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46 lines
1.3 KiB
Diff
46 lines
1.3 KiB
Diff
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From b7bf519f24c2160c092ce8b6c9f72ead91dbe8cb Mon Sep 17 00:00:00 2001
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From: Alexey Sheplyakov <asheplyakov@altlinux.org>
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Date: Thu, 8 Oct 2020 18:31:28 +0400
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Subject: [PATCH 624/634] efi-rtc: avoid calling efi.get_time on Baikal-M SoC
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Old versions of Baikal-M UEFI (before SDK-M 4.4) do NOT provide
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get_time at the runtime (not even as a stub), hence calling it
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results in an Oops.
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X-DONTUPSTREAM
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X-legacy
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---
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drivers/rtc/rtc-efi.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/drivers/rtc/rtc-efi.c b/drivers/rtc/rtc-efi.c
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index 138c5e004..af2328022 100644
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--- a/drivers/rtc/rtc-efi.c
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+++ b/drivers/rtc/rtc-efi.c
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@@ -17,6 +17,7 @@
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/efi.h>
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+#include <linux/of.h>
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#define EFI_ISDST (EFI_TIME_ADJUST_DAYLIGHT|EFI_TIME_IN_DAYLIGHT)
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@@ -257,6 +258,14 @@ static int __init efi_rtc_probe(struct platform_device *dev)
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efi_time_t eft;
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efi_time_cap_t cap;
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+#ifdef CONFIG_OF
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+ /* efi.get_time is not always safe to call since some UEFI
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+ * implementations do not privde get_time at runtime. */
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+ if (of_device_is_compatible(of_root, "baikal,baikal-m")) {
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+ dev_err(&dev->dev, "Baikal-M UEFI has no get_time\n");
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+ return -ENODEV;
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+ }
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+#endif
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/* First check if the RTC is usable */
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if (efi.get_time(&eft, &cap) != EFI_SUCCESS)
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return -ENODEV;
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--
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2.33.2
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