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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: 81b18bce48 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sunil Muthuswamy 2018-07-28 21:58:45 +00:00 committed by Greg Kroah-Hartman
parent 2d8bc61952
commit ddcaf3ca4c
1 changed files with 4 additions and 7 deletions
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11
drivers/hv/vmbus_drv.c
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@ -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 = {