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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 1/4] Drivers: hv: vmus: Fix the check for return value from kmsg get dump buffer
Date:   Sat, 28 Jul 2018 21:58:45 +0000
Message-Id: <20180728215848.13814-1-kys@linuxonhyperv.com>
In-Reply-To: <20180728215630.13712-1-kys@linuxonhyperv.com>
References: <20180728215630.13712-1-kys@linuxonhyperv.com>
Reply-To: kys@microsoft.com
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From: Sunil Muthuswamy <sunilmut@microsoft.com>

The code to support panic control message was checking the return was
checking the return value from kmsg_dump_get_buffer as error value, which
is not what the routine returns. 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 | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 05e37283d7c3..a7f33c1f42c5 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -1047,13 +1047,10 @@ static void hv_kmsg_dump(struct kmsg_dumper *dumper,
 	 * Write dump contents to the page. No need to synchronize; panic should
 	 * be single-threaded.
 	 */
-	if (!kmsg_dump_get_buffer(dumper, true, hv_panic_page,
-				  PAGE_SIZE, &bytes_written)) {
-		pr_err("Hyper-V: Unable to get kmsg data for panic\n");
-		return;
-	}
-
-	hyperv_report_panic_msg(panic_pa, bytes_written);
+	kmsg_dump_get_buffer(dumper, true, hv_panic_page, PAGE_SIZE,
+			     &bytes_written);
+	if (bytes_written)
+		hyperv_report_panic_msg(panic_pa, bytes_written);
 }
 
 static struct kmsg_dumper hv_kmsg_dumper = {
-- 
2.17.1