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Commit ddcaf3ca authored by Sunil Muthuswamy's avatar Sunil Muthuswamy Committed by Greg Kroah-Hartman
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Drivers: hv: vmus: Fix the check for return value from kmsg get dump buffer 



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: 81b18bce ("Drivers: HV: Send one page worth of kmsg dump over Hyper-V during panic")

Signed-off-by: default avatarSunil Muthuswamy <sunilmut@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2d8bc619

drivers/hv/vmbus_drv.c

+4 −7
Original line number Diff line number Diff line
@@ -1047,12 +1047,9 @@ 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;

	}



	kmsg_dump_get_buffer(dumper, true, hv_panic_page, PAGE_SIZE,

			     &bytes_written);

	if (bytes_written)

		hyperv_report_panic_msg(panic_pa, bytes_written);

}