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xprtrdma: Fix MR list handling 

Close some holes introduced by commit 6dc6ec9e04 ("xprtrdma: Cache
free MRs in each rpcrdma_req") that could result in list corruption.

In addition, the result that is tabulated in @count is no longer
used, so @count is removed.

Fixes: 6dc6ec9e04 ("xprtrdma: Cache free MRs in each rpcrdma_req")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2019-10-09 13:07:43 -04:00 committed by Anna Schumaker
parent 2ae50ad68c
commit c3700780a0
1 changed files with 21 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
net/sunrpc/xprtrdma/verbs.c
View File

@ -79,7 +79,6 @@ static void rpcrdma_reqs_reset(struct rpcrdma_xprt *r_xprt);
static void rpcrdma_reps_destroy(struct rpcrdma_buffer *buf);
static void rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt);
static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf);
static void rpcrdma_mr_free(struct rpcrdma_mr *mr);
static struct rpcrdma_regbuf *
rpcrdma_regbuf_alloc(size_t size, enum dma_data_direction direction,
gfp_t flags);
@ -966,7 +965,7 @@ rpcrdma_mrs_create(struct rpcrdma_xprt *r_xprt)
mr->mr_xprt = r_xprt;
spin_lock(&buf->rb_lock);
list_add(&mr->mr_list, &buf->rb_mrs);
rpcrdma_mr_push(mr, &buf->rb_mrs);
list_add(&mr->mr_all, &buf->rb_all_mrs);
spin_unlock(&buf->rb_lock);
}
@ -1183,10 +1182,19 @@ int rpcrdma_buffer_create(struct rpcrdma_xprt *r_xprt)
*/
void rpcrdma_req_destroy(struct rpcrdma_req *req)
{
struct rpcrdma_mr *mr;
list_del(&req->rl_all);
while (!list_empty(&req->rl_free_mrs))
rpcrdma_mr_free(rpcrdma_mr_pop(&req->rl_free_mrs));
while ((mr = rpcrdma_mr_pop(&req->rl_free_mrs))) {
struct rpcrdma_buffer *buf = &mr->mr_xprt->rx_buf;
spin_lock(&buf->rb_lock);
list_del(&mr->mr_all);
spin_unlock(&buf->rb_lock);
frwr_release_mr(mr);
}
rpcrdma_regbuf_free(req->rl_recvbuf);
rpcrdma_regbuf_free(req->rl_sendbuf);
@ -1194,24 +1202,28 @@ void rpcrdma_req_destroy(struct rpcrdma_req *req)
kfree(req);
}
static void
rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
/**
* rpcrdma_mrs_destroy - Release all of a transport's MRs
* @buf: controlling buffer instance
*
* Relies on caller holding the transport send lock to protect
* removing mr->mr_list from req->rl_free_mrs safely.
*/
static void rpcrdma_mrs_destroy(struct rpcrdma_buffer *buf)
{
struct rpcrdma_xprt *r_xprt = container_of(buf, struct rpcrdma_xprt,
rx_buf);
struct rpcrdma_mr *mr;
unsigned int count;
count = 0;
spin_lock(&buf->rb_lock);
while ((mr = list_first_entry_or_null(&buf->rb_all_mrs,
struct rpcrdma_mr,
mr_all)) != NULL) {
list_del(&mr->mr_list);
list_del(&mr->mr_all);
spin_unlock(&buf->rb_lock);
frwr_release_mr(mr);
count++;
spin_lock(&buf->rb_lock);
}
spin_unlock(&buf->rb_lock);
@ -1284,17 +1296,6 @@ void rpcrdma_mr_put(struct rpcrdma_mr *mr)
rpcrdma_mr_push(mr, &mr->mr_req->rl_free_mrs);
}
static void rpcrdma_mr_free(struct rpcrdma_mr *mr)
{
struct rpcrdma_xprt *r_xprt = mr->mr_xprt;
struct rpcrdma_buffer *buf = &r_xprt->rx_buf;
mr->mr_req = NULL;
spin_lock(&buf->rb_lock);
rpcrdma_mr_push(mr, &buf->rb_mrs);
spin_unlock(&buf->rb_lock);
}
/**
* rpcrdma_buffer_get - Get a request buffer
* @buffers: Buffer pool from which to obtain a buffer