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Subject[PATCH v2] xen: make functions in xen-acpi-processor return void
Date
There are several functions in xen-acpi-processor which either always
return the same value or where the returned value is never checked.

Make the functions return void.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/xen/xen-acpi-processor.c | 51 +++++++++++++++-------------------------
1 file changed, 19 insertions(+), 32 deletions(-)

diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 23e391d..45be017 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -54,7 +54,7 @@ static unsigned long *acpi_id_present;
/* And if there is an _CST definition (or a PBLK) for the ACPI IDs */
static unsigned long *acpi_id_cst_present;

-static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
+static void push_cxx_to_hypervisor(struct acpi_processor *_pr)
{
struct xen_platform_op op = {
.cmd = XENPF_set_processor_pminfo,
@@ -70,7 +70,7 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
dst_cx_states = kcalloc(_pr->power.count,
sizeof(struct xen_processor_cx), GFP_KERNEL);
if (!dst_cx_states)
- return -ENOMEM;
+ return;

for (ok = 0, i = 1; i <= _pr->power.count; i++) {
cx = &_pr->power.states[i];
@@ -104,7 +104,7 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
if (!ok) {
pr_debug("No _Cx for ACPI CPU %u\n", _pr->acpi_id);
kfree(dst_cx_states);
- return -EINVAL;
+ return;
}
op.u.set_pminfo.power.count = ok;
op.u.set_pminfo.power.flags.bm_control = _pr->flags.bm_control;
@@ -135,8 +135,6 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr)
ret, _pr->acpi_id);

kfree(dst_cx_states);
-
- return ret;
}
static struct xen_processor_px *
xen_copy_pss_data(struct acpi_processor *_pr,
@@ -161,8 +159,8 @@ xen_copy_pss_data(struct acpi_processor *_pr,
}
return dst_states;
}
-static int xen_copy_psd_data(struct acpi_processor *_pr,
- struct xen_processor_performance *dst)
+static void xen_copy_psd_data(struct acpi_processor *_pr,
+ struct xen_processor_performance *dst)
{
struct acpi_psd_package *pdomain;

@@ -189,10 +187,9 @@ static int xen_copy_psd_data(struct acpi_processor *_pr,

}
memcpy(&(dst->domain_info), pdomain, sizeof(struct acpi_psd_package));
- return 0;
}
-static int xen_copy_pct_data(struct acpi_pct_register *pct,
- struct xen_pct_register *dst_pct)
+static void xen_copy_pct_data(struct acpi_pct_register *pct,
+ struct xen_pct_register *dst_pct)
{
/* It would be nice if you could just do 'memcpy(pct, dst_pct') but
* sadly the Xen structure did not have the proper padding so the
@@ -205,9 +202,8 @@ static int xen_copy_pct_data(struct acpi_pct_register *pct,
dst_pct->bit_offset = pct->bit_offset;
dst_pct->reserved = pct->reserved;
dst_pct->address = pct->address;
- return 0;
}
-static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
+static void push_pxx_to_hypervisor(struct acpi_processor *_pr)
{
int ret = 0;
struct xen_platform_op op = {
@@ -233,13 +229,12 @@ static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
set_xen_guest_handle(dst_perf->states, dst_states);
dst_perf->flags |= XEN_PX_PSS;
}
- if (!xen_copy_psd_data(_pr, dst_perf))
- dst_perf->flags |= XEN_PX_PSD;
+ xen_copy_psd_data(_pr, dst_perf);
+ dst_perf->flags |= XEN_PX_PSD;

if (dst_perf->flags != (XEN_PX_PSD | XEN_PX_PSS | XEN_PX_PCT | XEN_PX_PPC)) {
pr_warn("ACPI CPU%u missing some P-state data (%x), skipping\n",
_pr->acpi_id, dst_perf->flags);
- ret = -ENODEV;
goto err_free;
}

@@ -268,26 +263,18 @@ static int push_pxx_to_hypervisor(struct acpi_processor *_pr)
err_free:
if (!IS_ERR_OR_NULL(dst_states))
kfree(dst_states);
-
- return ret;
}
-static int upload_pm_data(struct acpi_processor *_pr)
+static void upload_pm_data(struct acpi_processor *_pr)
{
- int err = 0;
-
mutex_lock(&acpi_ids_mutex);
- if (__test_and_set_bit(_pr->acpi_id, acpi_ids_done)) {
- mutex_unlock(&acpi_ids_mutex);
- return -EBUSY;
+ if (!__test_and_set_bit(_pr->acpi_id, acpi_ids_done)) {
+ if (_pr->flags.power)
+ push_cxx_to_hypervisor(_pr);
+
+ if (_pr->performance && _pr->performance->states)
+ push_pxx_to_hypervisor(_pr);
}
- if (_pr->flags.power)
- err = push_cxx_to_hypervisor(_pr);
-
- if (_pr->performance && _pr->performance->states)
- err |= push_pxx_to_hypervisor(_pr);
-
mutex_unlock(&acpi_ids_mutex);
- return err;
}
static unsigned int __init get_max_acpi_id(void)
{
@@ -417,7 +404,7 @@ static int check_acpi_ids(struct acpi_processor *pr_backup)
pr_backup->acpi_id = i;
/* Mask out C-states if there are no _CST or PBLK */
pr_backup->flags.power = test_bit(i, acpi_id_cst_present);
- (void)upload_pm_data(pr_backup);
+ upload_pm_data(pr_backup);
}
}

@@ -457,7 +444,7 @@ static int xen_upload_processor_pm_data(void)
if (pr_backup)
memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
}
- (void)upload_pm_data(_pr);
+ upload_pm_data(_pr);
}

rc = check_acpi_ids(pr_backup);
--
2.10.2
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