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xprtrdma: FMR does not need list_del_init() 

Clean up.

Commit 38f1932e60 ("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: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Chuck Lever 2017-06-08 11:53:08 -04:00 committed by Anna Schumaker
parent 173b8f49b3
commit e2f6ef0915
1 changed files with 10 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
net/sunrpc/xprtrdma/fmr_ops.c
View File

@ -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 @@ out_maperr:
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);
}
}