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Staging: hv: vmbus: Retry vmbus_post_msg() before giving up

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The function hv_post_msg() can fail because of transient resource
conditions. It may be useful to retry the operation.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-08-25 09:49:01 -07:00 committed by Greg Kroah-Hartman
parent 0293e5cabc
commit 5289d3d160
2 changed files with 18 additions and 1 deletions
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1
arch/x86/include/asm/hyperv.h
View file

@ -189,5 +189,6 @@
#define HV_STATUS_INVALID_HYPERCALL_CODE 2
#define HV_STATUS_INVALID_HYPERCALL_INPUT 3
#define HV_STATUS_INVALID_ALIGNMENT 4
#define HV_STATUS_INSUFFICIENT_BUFFERS 19
#endif

18
drivers/staging/hv/connection.c
View file

@ -25,6 +25,7 @@
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@ -268,10 +269,25 @@ void vmbus_on_event(unsigned long data)
int vmbus_post_msg(void *buffer, size_t buflen)
{
union hv_connection_id conn_id;
int ret = 0;
int retries = 0;
conn_id.asu32 = 0;
conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
return hv_post_message(conn_id, 1, buffer, buflen);
/*
* hv_post_message() can have transient failures because of
* insufficient resources. Retry the operation a couple of
* times before giving up.
*/
while (retries < 3) {
ret = hv_post_message(conn_id, 1, buffer, buflen);
if (ret != HV_STATUS_INSUFFICIENT_BUFFERS)
return ret;
retries++;
msleep(100);
}
return ret;
}
/*