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authorHaiyang Zhang <haiyangz@microsoft.com>2012-07-25 08:08:41 +0000
committerDavid S. Miller <davem@davemloft.net>2012-07-25 15:31:30 -0700
commitfa85a6c29a493e8a574bf62a6349b38b591bf885 (patch)
tree4022b7c94ff929f0f91d6eb6dffcf3feffa301ba /drivers/net/hyperv
parent4331debc51ee1ce319f4a389484e0e8e05de2aca (diff)
downloadblackbird-op-linux-fa85a6c29a493e8a574bf62a6349b38b591bf885.tar.gz
blackbird-op-linux-fa85a6c29a493e8a574bf62a6349b38b591bf885.zip
hyperv: Add a check for ring_size value
It prevents ring_size being set to a too small value. Reported-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> Reviewed-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/hyperv')
-rw-r--r--drivers/net/hyperv/netvsc_drv.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 8e23c084c4a7..8c5a1c43c81d 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -47,7 +47,7 @@ struct net_device_context {
struct work_struct work;
};
-
+#define RING_SIZE_MIN 64
static int ring_size = 128;
module_param(ring_size, int, S_IRUGO);
MODULE_PARM_DESC(ring_size, "Ring buffer size (# of pages)");
@@ -518,6 +518,11 @@ static void __exit netvsc_drv_exit(void)
static int __init netvsc_drv_init(void)
{
+ if (ring_size < RING_SIZE_MIN) {
+ ring_size = RING_SIZE_MIN;
+ pr_info("Increased ring_size to %d (min allowed)\n",
+ ring_size);
+ }
return vmbus_driver_register(&netvsc_drv);
}
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