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ACPI fix for v4.15-rc3 

This fixes an out of bounds warning from KASAN in the ACPI
 CPPC driver.
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Merge tag 'acpi-4.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fix from Rafael Wysocki:
 "This fixes an out of bounds warning from KASAN in the ACPI CPPC
  driver"

* tag 'acpi-4.15-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / CPPC: Fix KASAN global out of bounds warning
This commit is contained in:
Linus Torvalds 2017-12-08 10:05:53 -08:00
parent 7ed9fd2e29 1ecbd7170d
commit 3625de4b28
1 changed files with 15 additions and 8 deletions
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23
drivers/acpi/cppc_acpi.c
View File

@ -949,7 +949,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
}
*val = 0;
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM)
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM && pcc_ss_id >= 0)
vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id);
else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
vaddr = reg_res->sys_mem_vaddr;
@ -988,7 +988,7 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = &reg_res->cpc_entry.reg;
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM)
if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM && pcc_ss_id >= 0)
vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id);
else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
vaddr = reg_res->sys_mem_vaddr;
@ -1035,14 +1035,15 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps)
*lowest_non_linear_reg, *nominal_reg;
u64 high, low, nom, min_nonlinear;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
struct cppc_pcc_data *pcc_ss_data;
int ret = 0, regs_in_pcc = 0;
if (!cpc_desc) {
if (!cpc_desc || pcc_ss_id < 0) {
pr_debug("No CPC descriptor for CPU:%d\n", cpunum);
return -ENODEV;
}
pcc_ss_data = pcc_data[pcc_ss_id];
highest_reg = &cpc_desc->cpc_regs[HIGHEST_PERF];
lowest_reg = &cpc_desc->cpc_regs[LOWEST_PERF];
lowest_non_linear_reg = &cpc_desc->cpc_regs[LOW_NON_LINEAR_PERF];
@ -1095,15 +1096,16 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs)
struct cpc_register_resource *delivered_reg, *reference_reg,
*ref_perf_reg, *ctr_wrap_reg;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum);
struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
struct cppc_pcc_data *pcc_ss_data;
u64 delivered, reference, ref_perf, ctr_wrap_time;
int ret = 0, regs_in_pcc = 0;
if (!cpc_desc) {
if (!cpc_desc || pcc_ss_id < 0) {
pr_debug("No CPC descriptor for CPU:%d\n", cpunum);
return -ENODEV;
}
pcc_ss_data = pcc_data[pcc_ss_id];
delivered_reg = &cpc_desc->cpc_regs[DELIVERED_CTR];
reference_reg = &cpc_desc->cpc_regs[REFERENCE_CTR];
ref_perf_reg = &cpc_desc->cpc_regs[REFERENCE_PERF];
@ -1172,11 +1174,12 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls)
struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
int ret = 0;
if (!cpc_desc) {
if (!cpc_desc || pcc_ss_id < 0) {
pr_debug("No CPC descriptor for CPU:%d\n", cpu);
return -ENODEV;
}
pcc_ss_data = pcc_data[pcc_ss_id];
desired_reg = &cpc_desc->cpc_regs[DESIRED_PERF];
/*
@ -1301,7 +1304,7 @@ unsigned int cppc_get_transition_latency(int cpu_num)
struct cpc_desc *cpc_desc;
struct cpc_register_resource *desired_reg;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu_num);
struct cppc_pcc_data *pcc_ss_data = pcc_data[pcc_ss_id];
struct cppc_pcc_data *pcc_ss_data;
cpc_desc = per_cpu(cpc_desc_ptr, cpu_num);
if (!cpc_desc)
@ -1311,6 +1314,10 @@ unsigned int cppc_get_transition_latency(int cpu_num)
if (!CPC_IN_PCC(desired_reg))
return CPUFREQ_ETERNAL;
if (pcc_ss_id < 0)
return CPUFREQ_ETERNAL;
pcc_ss_data = pcc_data[pcc_ss_id];
if (pcc_ss_data->pcc_mpar)
latency_ns = 60 * (1000 * 1000 * 1000 / pcc_ss_data->pcc_mpar);