xenfb: use the correct condition to avoid excessive looping
In commit ac0487e1
("xenfb.c: avoid expensive loops when prod <=
out_cons"), ">=" was used. In fact, a full ring is a legit state.
Correct the test to use ">".
Reported-by: "Hao, Xudong" <xudong.hao@intel.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Tested-by: "Hao, Xudong" <xudong.hao@intel.com>
Acked-by: Anthony Perard <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
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@ -775,7 +775,7 @@ static void xenfb_handle_events(struct XenFB *xenfb)
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prod = page->out_prod;
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prod = page->out_prod;
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out_cons = page->out_cons;
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out_cons = page->out_cons;
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if (prod - out_cons >= XENFB_OUT_RING_LEN) {
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if (prod - out_cons > XENFB_OUT_RING_LEN) {
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return;
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return;
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}
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}
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xen_rmb(); /* ensure we see ring contents up to prod */
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xen_rmb(); /* ensure we see ring contents up to prod */
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