From: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 10 Feb 2017 21:01:55 +0100
Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.
Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/hfi1/user_sdma.c | 16 ++++++----------
1 file changed, 6 insertions(+), 10 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/user_sdma.c b/drivers/infiniband/hw/hfi1/user_sdma.c
index 991e7f3d8e18..5a73d738f2ba 100644
--- a/drivers/infiniband/hw/hfi1/user_sdma.c
+++ b/drivers/infiniband/hw/hfi1/user_sdma.c
@@ -731,23 +731,18 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec,
ret = -EINVAL;
goto free_req;
}
- req->tids = kcalloc(ntids, sizeof(*req->tids), GFP_KERNEL);
- if (!req->tids) {
- ret = -ENOMEM;
- goto free_req;
- }
/*
* We have to copy all of the tids because they may vary
* in size and, therefore, the TID count might not be
* equal to the pkt count. However, there is no way to
* tell at this point.
*/
- ret = copy_from_user(req->tids, iovec[idx].iov_base,
- ntids * sizeof(*req->tids));
- if (ret) {
+ req->tids = memdup_user(iovec[idx].iov_base,
+ sizeof(*req->tids) * ntids);
+ if (IS_ERR(req->tids)) {
+ ret = PTR_ERR(req->tids);
SDMA_DBG(req, "Failed to copy %d TIDs (%d)",
ntids, ret);
- ret = -EFAULT;
goto free_req;
}
req->n_tids = ntids;
@@ -1606,7 +1601,8 @@ static void user_sdma_free_request(struct user_sdma_request *req, bool unpin)
atomic_dec(&node->refcount);
}
}
- kfree(req->tids);
+ if (!IS_ERR(req->tids))
+ kfree(req->tids);
clear_bit(req->info.comp_idx, req->pq->req_in_use);
}
--
2.11.1
--
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