[PATCH -fixes] drivers: perf: Fix panic in riscv SBI mmap support

[patchwork-bot+linux-riscv at kernel.org]

Hello:

This patch was applied to riscv/linux.git (fixes)
by Palmer Dabbelt <palmer at rivosinc.com>:

On Fri,  6 Oct 2023 10:20:10 +0200 you wrote:
> The following panic can happen when mmap is called before the pmu add
> callback which sets the hardware counter index: this happens for example
> with the following command `perf record --no-bpf-event -n kill`.
> 
> [   99.461486] CPU: 1 PID: 1259 Comm: perf Tainted: G            E      6.6.0-rc4ubuntu-defconfig #2
> [   99.461669] Hardware name: riscv-virtio,qemu (DT)
> [   99.461748] epc : pmu_sbi_set_scounteren+0x42/0x44
> [   99.462337]  ra : smp_call_function_many_cond+0x126/0x5b0
> [   99.462369] epc : ffffffff809f9d24 ra : ffffffff800f93e0 sp : ff60000082153aa0
> [   99.462407]  gp : ffffffff82395c98 tp : ff6000009a218040 t0 : ff6000009ab3a4f0
> [   99.462425]  t1 : 0000000000000004 t2 : 0000000000000100 s0 : ff60000082153ab0
> [   99.462459]  s1 : 0000000000000000 a0 : ff60000098869528 a1 : 0000000000000000
> [   99.462473]  a2 : 000000000000001f a3 : 0000000000f00000 a4 : fffffffffffffff8
> [   99.462488]  a5 : 00000000000000cc a6 : 0000000000000000 a7 : 0000000000735049
> [   99.462502]  s2 : 0000000000000001 s3 : ffffffff809f9ce2 s4 : ff60000098869528
> [   99.462516]  s5 : 0000000000000002 s6 : 0000000000000004 s7 : 0000000000000001
> [   99.462530]  s8 : ff600003fec98bc0 s9 : ffffffff826c5890 s10: ff600003fecfcde0
> [   99.462544]  s11: ff600003fec98bc0 t3 : ffffffff819e2558 t4 : ff1c000004623840
> [   99.462557]  t5 : 0000000000000901 t6 : ff6000008feeb890
> [   99.462570] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000003
> [   99.462658] [<ffffffff809f9d24>] pmu_sbi_set_scounteren+0x42/0x44
> [   99.462979] Code: 1060 4785 97bb 00d7 8fd9 9073 1067 6422 0141 8082 (9002) 0013
> [   99.463335] Kernel BUG [#2]
> 
> [...]

Here is the summary with links:
  - [-fixes] drivers: perf: Fix panic in riscv SBI mmap support
    https://git.kernel.org/riscv/c/3fec323339a4

You are awesome, thank you!
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