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coresight: ultrasoc-smb: Use guards to cleanup

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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
This commit is contained in:
Junhao He 2023-11-14 21:33:46 +08:00 committed by Suzuki K Poulose
parent 32d9a78bb9
commit 60e5f23dc5
1 changed files with 22 additions and 48 deletions
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70
drivers/hwtracing/coresight/ultrasoc-smb.c
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@ -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;
}