From: Michael Kelley <mikelley@microsoft.com>
To: "ltykernel@gmail.com" <ltykernel@gmail.com>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <liuwe@microsoft.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"bp@alien8.de" <bp@alien8.de>, "hpa@zytor.com" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
vkuznets <vkuznets@redhat.com>
Subject: RE: [PATCH 2/4] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump
Date: Thu, 19 Mar 2020 00:38:07 +0000 [thread overview]
Message-ID: <MW2PR2101MB105297BB206C91C1CBF1477DD7F40@MW2PR2101MB1052.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20200317132523.1508-3-Tianyu.Lan@microsoft.com>
From: ltykernel@gmail.com <ltykernel@gmail.com> Sent: Tuesday, March 17, 2020 6:25 AM
>
> If fail to register kmsg dump on Hyper-V platform, hv_panic_page
> will not be used anywhere. So free and reset it.
Slight commit message wording cleanup:
If kmsg_dump_register() fails, hv_panic_page will not be used
anywhere. So free and reset it.
>
> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> ---
> drivers/hv/vmbus_drv.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index b56b9fb9bd90..b043efea092a 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1385,9 +1385,13 @@ static int vmbus_bus_init(void)
> hv_panic_page = (void *)hv_alloc_hyperv_zeroed_page();
> if (hv_panic_page) {
> ret = kmsg_dump_register(&hv_kmsg_dumper);
> - if (ret)
> + if (ret) {
> pr_err("Hyper-V: kmsg dump register "
> "error 0x%x\n", ret);
> + hv_free_hyperv_page(
> + (unsigned long)hv_panic_page);
> + hv_panic_page = NULL;
> + }
> } else
> pr_err("Hyper-V: panic message page memory "
> "allocation failed");
> --
> 2.14.5
next prev parent reply other threads:[~2020-03-19 0:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-17 13:25 [PATCH 0/4] x86/Hyper-V: Panic code path fixes ltykernel
2020-03-17 13:25 ` [PATCH 0/4] x86/Hyper-V: Unload vmbus channel in hv panic callback ltykernel
2020-03-17 17:35 ` Wei Liu
2020-03-19 8:24 ` Tianyu Lan
2020-03-18 15:58 ` Vitaly Kuznetsov
2020-03-19 0:33 ` Michael Kelley
2020-03-19 8:03 ` Vitaly Kuznetsov
2020-03-19 15:06 ` Michael Kelley
2020-03-19 8:03 ` Tianyu Lan
2020-03-17 13:25 ` [PATCH 2/4] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump ltykernel
2020-03-17 17:36 ` Wei Liu
2020-03-19 8:12 ` Tianyu Lan
2020-03-19 0:38 ` Michael Kelley [this message]
2020-03-17 13:25 ` [PATCH 3/4] x86/Hyper-V: Trigger crash enlightenment only once during system crash ltykernel
2020-03-19 0:45 ` Michael Kelley
2020-03-17 13:25 ` [PATCH 4/4] x86/Hyper-V: Report crash register data or ksmg before running crash kernel ltykernel
2020-03-19 0:51 ` Michael Kelley
2020-03-19 0:57 ` [PATCH 0/4] x86/Hyper-V: Panic code path fixes Michael Kelley
2020-03-19 14:08 ` Tianyu Lan
2020-03-19 15:14 ` Michael Kelley
2020-03-19 16:07 ` Michael Kelley
2020-03-20 2:21 ` Tianyu Lan
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