/[packages]/backports/8/kernel/current/SOURCES/cpufreq-amd-pstate-fix-kernel-hang-issue-while-amd-pstate-unregistering.patch
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Contents of /backports/8/kernel/current/SOURCES/cpufreq-amd-pstate-fix-kernel-hang-issue-while-amd-pstate-unregistering.patch

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Revision 1932881 - (show annotations) (download)
Sat Jan 14 11:15:03 2023 UTC (14 months, 1 week ago) by tmb
File size: 1551 byte(s)
- update to 6.1.6
  * drop merged patches
- add current -stable queue
- Revert "mm/compaction: fix set skip in fast_find_migrateblock"
- wifi: brcmfmac: fix regression for Broadcom PCIe wifi devices


1 From 4f3085f87b51a551a0647f218d4f324796ecb703 Mon Sep 17 00:00:00 2001
2 From: Perry Yuan <perry.yuan@amd.com>
3 Date: Tue, 10 Jan 2023 23:10:29 +0800
4 Subject: cpufreq: amd-pstate: fix kernel hang issue while amd-pstate unregistering
5
6 From: Perry Yuan <perry.yuan@amd.com>
7
8 commit 4f3085f87b51a551a0647f218d4f324796ecb703 upstream.
9
10 In the amd_pstate_adjust_perf(), there is one cpufreq_cpu_get() call to
11 increase increments the kobject reference count of policy and make it as
12 busy. Therefore, a corresponding call to cpufreq_cpu_put() is needed to
13 decrement the kobject reference count back, it will resolve the kernel
14 hang issue when unregistering the amd-pstate driver and register the
15 `amd_pstate_epp` driver instance.
16
17 Fixes: 1d215f0319 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State")
18 Acked-by: Huang Rui <ray.huang@amd.com>
19 Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
20 Tested-by: Wyes Karny <wyes.karny@amd.com>
21 Signed-off-by: Perry Yuan <perry.yuan@amd.com>
22 Cc: 5.17+ <stable@vger.kernel.org> # 5.17+
23 Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
24 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
25 ---
26 drivers/cpufreq/amd-pstate.c | 1 +
27 1 file changed, 1 insertion(+)
28
29 --- a/drivers/cpufreq/amd-pstate.c
30 +++ b/drivers/cpufreq/amd-pstate.c
31 @@ -307,6 +307,7 @@ static void amd_pstate_adjust_perf(unsig
32 max_perf = min_perf;
33
34 amd_pstate_update(cpudata, min_perf, des_perf, max_perf, true);
35 + cpufreq_cpu_put(policy);
36 }
37
38 static int amd_get_min_freq(struct amd_cpudata *cpudata)

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