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| author | Dexuan Cui <decui@microsoft.com> | 2015-02-27 11:25:59 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-01 19:30:07 -0800 |
| commit | 89f9f6796d41e10e224b0cb0027ddd78cb881f65 (patch) | |
| tree | db64755f71d4c714a1ca83d5bba30bdcd1c97279 /drivers/hv/connection.c | |
| parent | 1896566372579939eb86414ea3d664f18d5e909c (diff) | |
| download | linux-89f9f6796d41e10e224b0cb0027ddd78cb881f65.tar.gz linux-89f9f6796d41e10e224b0cb0027ddd78cb881f65.tar.bz2 linux-89f9f6796d41e10e224b0cb0027ddd78cb881f65.zip | |
hv: vmbus_post_msg: retry the hypercall on some transient errors
I got HV_STATUS_INVALID_CONNECTION_ID on Hyper-V 2008 R2 when keeping running
"rmmod hv_netvsc; modprobe hv_netvsc; rmmod hv_utils; modprobe hv_utils"
in a Linux guest. Looks the host has some kind of throttling mechanism if
some kinds of hypercalls are sent too frequently.
Without the patch, the driver can occasionally fail to load.
Also let's retry HV_STATUS_INSUFFICIENT_MEMORY, though we didn't get it
before.
Removed 'case -ENOMEM', since the hypervisor doesn't return this.
CC: "K. Y. Srinivasan" <kys@microsoft.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/connection.c')
| -rw-r--r-- | drivers/hv/connection.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c index c4acd1ce7c0c..af2388fdc6b9 100644 --- a/drivers/hv/connection.c +++ b/drivers/hv/connection.c @@ -440,9 +440,16 @@ int vmbus_post_msg(void *buffer, size_t buflen) ret = hv_post_message(conn_id, 1, buffer, buflen); switch (ret) { + case HV_STATUS_INVALID_CONNECTION_ID: + /* + * We could get this if we send messages too + * frequently. + */ + ret = -EAGAIN; + break; + case HV_STATUS_INSUFFICIENT_MEMORY: case HV_STATUS_INSUFFICIENT_BUFFERS: ret = -ENOMEM; - case -ENOMEM: break; case HV_STATUS_SUCCESS: return ret; @@ -452,7 +459,7 @@ int vmbus_post_msg(void *buffer, size_t buflen) } retries++; - msleep(100); + msleep(1000); } return ret; } |