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oprofile/x86: rework error handler in nmi_setup()

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This patch improves the error handler in nmi_setup(). Most parts of
the code are moved to allocate_msrs(). In case of an error
allocate_msrs() also frees already allocated memory. nmi_setup()
becomes easier and better extendable.

Signed-off-by: Robert Richter <robert.richter@amd.com>
This commit is contained in:
Robert Richter 2010-03-23 19:09:51 +01:00
parent 81c4a8a673
commit 8f5a2dd83a
1 changed files with 19 additions and 14 deletions
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33
arch/x86/oprofile/nmi_int.c
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@ -295,6 +295,7 @@ static void free_msrs(void)
kfree(per_cpu(cpu_msrs, i).controls);
per_cpu(cpu_msrs, i).controls = NULL;
}
nmi_shutdown_mux();
}
static int allocate_msrs(void)
@ -307,14 +308,21 @@ static int allocate_msrs(void)
per_cpu(cpu_msrs, i).counters = kzalloc(counters_size,
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).counters)
return 0;
goto fail;
per_cpu(cpu_msrs, i).controls = kzalloc(controls_size,
GFP_KERNEL);
if (!per_cpu(cpu_msrs, i).controls)
return 0;
goto fail;
}
if (!nmi_setup_mux())
goto fail;
return 1;
fail:
free_msrs();
return 0;
}
static void nmi_cpu_setup(void *dummy)
@ -342,17 +350,7 @@ static int nmi_setup(void)
int cpu;
if (!allocate_msrs())
err = -ENOMEM;
else if (!nmi_setup_mux())
err = -ENOMEM;
else
err = register_die_notifier(&profile_exceptions_nb);
if (err) {
free_msrs();
nmi_shutdown_mux();
return err;
}
return -ENOMEM;
/* We need to serialize save and setup for HT because the subset
* of msrs are distinct for save and setup operations
@ -374,9 +372,17 @@ static int nmi_setup(void)
mux_clone(cpu);
}
err = register_die_notifier(&profile_exceptions_nb);
if (err)
goto fail;
on_each_cpu(nmi_cpu_setup, NULL, 1);
nmi_enabled = 1;
return 0;
fail:
free_msrs();
return err;
}
static void nmi_cpu_restore_registers(struct op_msrs *msrs)
@ -421,7 +427,6 @@ static void nmi_shutdown(void)
nmi_enabled = 0;
on_each_cpu(nmi_cpu_shutdown, NULL, 1);
unregister_die_notifier(&profile_exceptions_nb);
nmi_shutdown_mux();
msrs = &get_cpu_var(cpu_msrs);
model->shutdown(msrs);
free_msrs();