Commit e2f6ef09 authored by Chuck Lever's avatar Chuck Lever Committed by Anna Schumaker

xprtrdma: FMR does not need list_del_init()

Clean up.

Commit 38f1932e ("xprtrdma: Remove FMRs from the unmap list
after unmapping") utilized list_del_init() to try to prevent some
list corruption. The corruption was actually caused by the reply
handler racing with a signal. Now that MR invalidation is properly
serialized, list_del_init() can safely be replaced.
Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent 173b8f49
......@@ -91,7 +91,7 @@ __fmr_unmap(struct rpcrdma_mw *mw)
list_add(&mw->fmr.fm_mr->list, &l);
rc = ib_unmap_fmr(&l);
list_del_init(&mw->fmr.fm_mr->list);
list_del(&mw->fmr.fm_mr->list);
return rc;
}
......@@ -261,7 +261,7 @@ fmr_op_map(struct rpcrdma_xprt *r_xprt, struct rpcrdma_mr_seg *seg,
static void
fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mws)
{
struct rpcrdma_mw *mw, *tmp;
struct rpcrdma_mw *mw;
LIST_HEAD(unmap_list);
int rc;
......@@ -283,9 +283,11 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mws)
/* ORDER: Now DMA unmap all of the req's MRs, and return
* them to the free MW list.
*/
list_for_each_entry_safe(mw, tmp, mws, mw_list) {
list_del_init(&mw->mw_list);
list_del_init(&mw->fmr.fm_mr->list);
while (!list_empty(mws)) {
mw = rpcrdma_pop_mw(mws);
dprintk("RPC: %s: DMA unmapping fmr %p\n",
__func__, &mw->fmr);
list_del(&mw->fmr.fm_mr->list);
ib_dma_unmap_sg(r_xprt->rx_ia.ri_device,
mw->mw_sg, mw->mw_nents, mw->mw_dir);
rpcrdma_put_mw(r_xprt, mw);
......@@ -296,9 +298,9 @@ fmr_op_unmap_sync(struct rpcrdma_xprt *r_xprt, struct list_head *mws)
out_reset:
pr_err("rpcrdma: ib_unmap_fmr failed (%i)\n", rc);
list_for_each_entry_safe(mw, tmp, mws, mw_list) {
list_del_init(&mw->mw_list);
list_del_init(&mw->fmr.fm_mr->list);
while (!list_empty(mws)) {
mw = rpcrdma_pop_mw(mws);
list_del(&mw->fmr.fm_mr->list);
fmr_op_recover_mr(mw);
}
}
......
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