| .. | .. |
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| 796 | 796 | int ret = 0; |
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| 797 | 797 | ktime_t now; |
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| 798 | 798 | |
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| 799 | + /* |
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| 800 | + * If there is no broadcast device, tell the caller not to go |
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| 801 | + * into deep idle. |
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| 802 | + */ |
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| 803 | + if (!tick_broadcast_device.evtdev) |
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| 804 | + return -EBUSY; |
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| 805 | + |
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| 806 | + dev = this_cpu_ptr(&tick_cpu_device)->evtdev; |
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| 807 | + |
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| 808 | + /* |
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| 809 | + * If proxying the hardware timer for high-precision tick |
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| 810 | + * delivery to the out-of-band stage, the whole broadcast |
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| 811 | + * dance is a no-go. Deny entering deep idle. |
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| 812 | + */ |
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| 813 | + if (dev->features & CLOCK_EVT_FEAT_PROXY) |
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| 814 | + return -EBUSY; |
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| 815 | + |
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| 799 | 816 | raw_spin_lock(&tick_broadcast_lock); |
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| 800 | 817 | bc = tick_broadcast_device.evtdev; |
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| 801 | 818 | |
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