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authorJunhao He <hejunhao3@huawei.com>2023-11-14 16:33:46 +0300
committerSuzuki K Poulose <suzuki.poulose@arm.com>2023-11-21 14:21:59 +0300
commit60e5f23dc5d68ec01e6dae8f4311230c7d2ccb8a (patch)
tree18f5137f2c8417fbf33403c764992c4f583002b1 /drivers/hwtracing
parent32d9a78bb9ff9da0082ea6fdb038bc1bf81f6992 (diff)
downloadlinux-60e5f23dc5d68ec01e6dae8f4311230c7d2ccb8a.tar.xz
coresight: ultrasoc-smb: Use guards to cleanup
Use guards to reduce gotos and simplify control flow. Signed-off-by: Junhao He <hejunhao3@huawei.com> Reviewed-by: James Clark <james.clark@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20231114133346.30489-5-hejunhao3@huawei.com
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/ultrasoc-smb.c70
1 files changed, 22 insertions, 48 deletions
diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c
index 2092433ff86e..10e886455b8b 100644
--- a/drivers/hwtracing/coresight/ultrasoc-smb.c
+++ b/drivers/hwtracing/coresight/ultrasoc-smb.c
@@ -97,27 +97,19 @@ static int smb_open(struct inode *inode, struct file *file)
{
struct smb_drv_data *drvdata = container_of(file->private_data,
struct smb_drv_data, miscdev);
- int ret = 0;
- spin_lock(&drvdata->spinlock);
+ guard(spinlock)(&drvdata->spinlock);
- if (drvdata->reading) {
- ret = -EBUSY;
- goto out;
- }
+ if (drvdata->reading)
+ return -EBUSY;
- if (atomic_read(&drvdata->csdev->refcnt)) {
- ret = -EBUSY;
- goto out;
- }
+ if (atomic_read(&drvdata->csdev->refcnt))
+ return -EBUSY;
smb_update_data_size(drvdata);
-
drvdata->reading = true;
-out:
- spin_unlock(&drvdata->spinlock);
- return ret;
+ return 0;
}
static ssize_t smb_read(struct file *file, char __user *data, size_t len,
@@ -160,9 +152,8 @@ static int smb_release(struct inode *inode, struct file *file)
struct smb_drv_data *drvdata = container_of(file->private_data,
struct smb_drv_data, miscdev);
- spin_lock(&drvdata->spinlock);
+ guard(spinlock)(&drvdata->spinlock);
drvdata->reading = false;
- spin_unlock(&drvdata->spinlock);
return 0;
}
@@ -255,19 +246,15 @@ static int smb_enable(struct coresight_device *csdev, enum cs_mode mode,
struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
int ret = 0;
- spin_lock(&drvdata->spinlock);
+ guard(spinlock)(&drvdata->spinlock);
/* Do nothing, the trace data is reading by other interface now */
- if (drvdata->reading) {
- ret = -EBUSY;
- goto out;
- }
+ if (drvdata->reading)
+ return -EBUSY;
/* Do nothing, the SMB is already enabled as other mode */
- if (drvdata->mode != CS_MODE_DISABLED && drvdata->mode != mode) {
- ret = -EBUSY;
- goto out;
- }
+ if (drvdata->mode != CS_MODE_DISABLED && drvdata->mode != mode)
+ return -EBUSY;
switch (mode) {
case CS_MODE_SYSFS:
@@ -281,13 +268,10 @@ static int smb_enable(struct coresight_device *csdev, enum cs_mode mode,
}
if (ret)
- goto out;
+ return ret;
atomic_inc(&csdev->refcnt);
-
dev_dbg(&csdev->dev, "Ultrasoc SMB enabled\n");
-out:
- spin_unlock(&drvdata->spinlock);
return ret;
}
@@ -295,19 +279,14 @@ out:
static int smb_disable(struct coresight_device *csdev)
{
struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
- int ret = 0;
- spin_lock(&drvdata->spinlock);
+ guard(spinlock)(&drvdata->spinlock);
- if (drvdata->reading) {
- ret = -EBUSY;
- goto out;
- }
+ if (drvdata->reading)
+ return -EBUSY;
- if (atomic_dec_return(&csdev->refcnt)) {
- ret = -EBUSY;
- goto out;
- }
+ if (atomic_dec_return(&csdev->refcnt))
+ return -EBUSY;
/* Complain if we (somehow) got out of sync */
WARN_ON_ONCE(drvdata->mode == CS_MODE_DISABLED);
@@ -317,12 +296,9 @@ static int smb_disable(struct coresight_device *csdev)
/* Dissociate from the target process. */
drvdata->pid = -1;
drvdata->mode = CS_MODE_DISABLED;
-
dev_dbg(&csdev->dev, "Ultrasoc SMB disabled\n");
-out:
- spin_unlock(&drvdata->spinlock);
- return ret;
+ return 0;
}
static void *smb_alloc_buffer(struct coresight_device *csdev,
@@ -395,17 +371,17 @@ static unsigned long smb_update_buffer(struct coresight_device *csdev,
struct smb_drv_data *drvdata = dev_get_drvdata(csdev->dev.parent);
struct smb_data_buffer *sdb = &drvdata->sdb;
struct cs_buffers *buf = sink_config;
- unsigned long data_size = 0;
+ unsigned long data_size;
bool lost = false;
if (!buf)
return 0;
- spin_lock(&drvdata->spinlock);
+ guard(spinlock)(&drvdata->spinlock);
/* Don't do anything if another tracer is using this sink. */
if (atomic_read(&csdev->refcnt) != 1)
- goto out;
+ return 0;
smb_disable_hw(drvdata);
smb_update_data_size(drvdata);
@@ -424,8 +400,6 @@ static unsigned long smb_update_buffer(struct coresight_device *csdev,
smb_sync_perf_buffer(drvdata, buf, handle->head);
if (!buf->snapshot && lost)
perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
-out:
- spin_unlock(&drvdata->spinlock);
return data_size;
}