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From:   kys@linuxonhyperv.com
To:     gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
        devel@linuxdriverproject.org, olaf@aepfle.de, apw@canonical.com,
        jasowang@redhat.com, sthemmin@microsoft.com,
        Michael.H.Kelley@microsoft.com, vkuznets@redhat.com
Cc:     Sunil Muthuswamy <sunilmut@microsoft.com>,
        "K . Y . Srinivasan" <kys@microsoft.com>
Subject: [PATCH 2/4] Drivers: hv: vmbus: Fix the issue with freeing up hv_ctl_table_hdr
Date:   Sat, 28 Jul 2018 21:58:46 +0000
Message-Id: <20180728215848.13814-2-kys@linuxonhyperv.com>
In-Reply-To: <20180728215848.13814-1-kys@linuxonhyperv.com>
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 <20180728215848.13814-1-kys@linuxonhyperv.com>
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From: Sunil Muthuswamy <sunilmut@microsoft.com>

The check to free the Hyper-V control table header was reversed. This
fixes it.

Fixes: 81b18bce48af ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")

Signed-off-by: Sunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
---
 drivers/hv/vmbus_drv.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index a7f33c1f42c5..5e946b1be54c 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1176,11 +1176,8 @@ static int vmbus_bus_init(void)
 
 	bus_unregister(&hv_bus);
 	free_page((unsigned long)hv_panic_page);
-	if (!hv_ctl_table_hdr) {
-		unregister_sysctl_table(hv_ctl_table_hdr);
-		hv_ctl_table_hdr = NULL;
-	}
-
+	unregister_sysctl_table(hv_ctl_table_hdr);
+	hv_ctl_table_hdr = NULL;
 	return ret;
 }
 
@@ -1891,11 +1888,8 @@ static void __exit vmbus_exit(void)
 	}
 
 	free_page((unsigned long)hv_panic_page);
-	if (!hv_ctl_table_hdr) {
-		unregister_sysctl_table(hv_ctl_table_hdr);
-		hv_ctl_table_hdr = NULL;
-	}
-
+	unregister_sysctl_table(hv_ctl_table_hdr);
+	hv_ctl_table_hdr = NULL;
 	bus_unregister(&hv_bus);
 
 	cpuhp_remove_state(hyperv_cpuhp_online);
-- 
2.17.1