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| author |   Leon Romanovsky <leonro@mellanox.com> | 2018-12-11 11:41:05 +0200 |
|---|---|---|
| committer |   Jason Gunthorpe <jgg@mellanox.com> | 2018-12-11 14:38:17 -0700 |
| commit | 9435ef4caeea0a1141e461f9ee6f91b173867c05 (patch) | |
| tree | 2d1b1eccf7ec50027772a1bb2156a5baff4af720 /drivers/infiniband/core/uverbs_cmd.c | |
| parent | RDMA/vmw_pvrdma: Use atomic memory allocation in create AH (diff) | |
| download | linux-dev-9435ef4caeea0a1141e461f9ee6f91b173867c05.tar.xz linux-dev-9435ef4caeea0a1141e461f9ee6f91b173867c05.zip | |
RDMA/uverbs: Optimize clearing of extra bytes in response
Clear extra bytes in response in batch manner instead
of doing it per-byte.
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/infiniband/core/uverbs_cmd.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index b70749542471..7f10eade7653 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -58,19 +58,21 @@ static int uverbs_response(struct uverbs_attr_bundle *attrs, const void *resp, size_t resp_len) { - u8 __user *cur = attrs->ucore.outbuf + resp_len; - u8 __user *end = attrs->ucore.outbuf + attrs->ucore.outlen; int ret; if (copy_to_user(attrs->ucore.outbuf, resp, min(attrs->ucore.outlen, resp_len))) return -EFAULT; - /* Zero fill any extra memory that user space might have provided */ - for (; cur < end; cur++) { - ret = put_user(0, cur); + if (resp_len < attrs->ucore.outlen) { + /* + * Zero fill any extra memory that user + * space might have provided. + */ + ret = clear_user(attrs->ucore.outbuf + resp_len, + attrs->ucore.outlen - resp_len); if (ret) - return ret; + return -EFAULT; } return 0; |