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SUNRPC: Don't allow compiler optimisation of svc_xprt_release_slot()

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Use READ_ONCE() to tell the compiler to not optimse away the read of
xprt->xpt_flags in svc_xprt_release_slot().

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust
2019-01-03 09:17:12 -05:00
committed by J. Bruce Fields
parent 1c3da4452d
commit 1602a7b7d3
1 changed files with 6 additions and 2 deletions
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8
net/sunrpc/svc_xprt.c
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@@ -363,9 +363,13 @@ static void svc_xprt_release_slot(struct svc_rqst *rqstp)
static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt) static bool svc_xprt_has_something_to_do(struct svc_xprt *xprt)
{ {
if (xprt->xpt_flags & ((1<<XPT_CONN)|(1<<XPT_CLOSE))) unsigned long xpt_flags;
xpt_flags = READ_ONCE(xprt->xpt_flags);
if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE)))
return true; return true;
if (xprt->xpt_flags & ((1<<XPT_DATA)|(1<<XPT_DEFERRED))) { if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) {
if (xprt->xpt_ops->xpo_has_wspace(xprt) && if (xprt->xpt_ops->xpo_has_wspace(xprt) &&
svc_xprt_slots_in_range(xprt)) svc_xprt_slots_in_range(xprt))
return true; return true;