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Subject[PATCH 2/7] oprofile/x86: rework error handler in nmi_setup()
Date
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>
---
arch/x86/oprofile/nmi_int.c | 33 +++++++++++++++++++--------------
1 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 2c505ee..c0c21f2 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -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();
--
1.7.0.3



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