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bpf: net_sched: Fix using bpf qdisc as default qdisc #5240

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bpf: net_sched: Fix using bpf qdisc as default qdisc #5240

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Pull request for series with
subject: bpf: net_sched: Fix using bpf qdisc as default qdisc
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915

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Upstream branch: be2fea9
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
version: 1

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Upstream branch: 5cffad0
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
version: 1

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Upstream branch: 53ebef5
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 6aca583
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: b9c09fb
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: b9c09fb
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
version: 1

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Upstream branch: 60400cd
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 4cc2048
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 46eb012
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 64821d2
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
version: 1

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Upstream branch: 91dbac4
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 224ee86
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Upstream branch: 8e64c38
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=955915
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Upstream branch: 8e64c38
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=958247
version: 2

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Upstream branch: 38d976c
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=958247
version: 2

@ameryhung
bpf: net_sched: Fix using bpf qdisc as default qdisc
ba3c990 
Use bpf_try_module_get()/bpf_module_put() instead of try_module_get()/
module_put() when handling default qdisc since users can assign a bpf
qdisc to it.

To trigger the bug:
$ bpftool struct_ops register bpf_qdisc_fq.bpf.o /sys/fs/bpf
$ echo bpf_fq > /proc/sys/net/core/default_qdisc

Fixes: c824034 ("bpf: net_sched: Support implementation of Qdisc_ops in bpf")
Signed-off-by: Amery Hung <ameryhung@gmail.com>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=958247 irrelevant now. Closing PR.

@kernel-patches-daemon-bpf-rc kernel-patches-daemon-bpf-rc bot deleted the series/955915=>bpf-next branch April 29, 2025 21:53
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