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ptp: Simplify ptp_read() 

The mixture of gotos and direct return codes is inconsistent and just makes
the code harder to read. Let it consistently return error codes directly and
tidy the code flow up accordingly.

No functional change intended.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://patch.msgid.link/20250625115133.486953538@linutronix.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
pull/1279/head
Thomas Gleixner 2025-06-25 13:52:39 +02:00 committed by Jakub Kicinski
parent 4838bc9e27
commit b66d28142d
1 changed files with 16 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/ptp/ptp_chardev.c
View File

@ -106,8 +106,7 @@ int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin,
int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode)
{
struct ptp_clock *ptp =
container_of(pccontext->clk, struct ptp_clock, clock);
struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock);
struct timestamp_event_queue *queue;
char debugfsname[32];
@ -536,67 +535,46 @@ __poll_t ptp_poll(struct posix_clock_context *pccontext, struct file *fp,
ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags,
char __user *buf, size_t cnt)
{
struct ptp_clock *ptp =
container_of(pccontext->clk, struct ptp_clock, clock);
struct ptp_clock *ptp = container_of(pccontext->clk, struct ptp_clock, clock);
struct timestamp_event_queue *queue;
struct ptp_extts_event *event;
int result;
ssize_t result;
queue = pccontext->private_clkdata;
if (!queue) {
result = -EINVAL;
goto exit;
}
if (!queue)
return -EINVAL;
if (cnt % sizeof(struct ptp_extts_event) != 0) {
result = -EINVAL;
goto exit;
}
if (cnt % sizeof(*event) != 0)
return -EINVAL;
if (cnt > EXTTS_BUFSIZE)
cnt = EXTTS_BUFSIZE;
cnt = cnt / sizeof(struct ptp_extts_event);
if (wait_event_interruptible(ptp->tsev_wq,
ptp->defunct || queue_cnt(queue))) {
if (wait_event_interruptible(ptp->tsev_wq, ptp->defunct || queue_cnt(queue)))
return -ERESTARTSYS;
}
if (ptp->defunct) {
result = -ENODEV;
goto exit;
}
if (ptp->defunct)
return -ENODEV;
event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
if (!event) {
result = -ENOMEM;
goto exit;
}
if (!event)
return -ENOMEM;
scoped_guard(spinlock_irq, &queue->lock) {
size_t qcnt = queue_cnt(queue);
size_t qcnt = min((size_t)queue_cnt(queue), cnt / sizeof(*event));
if (cnt > qcnt)
cnt = qcnt;
for (size_t i = 0; i < cnt; i++) {
for (size_t i = 0; i < qcnt; i++) {
event[i] = queue->buf[queue->head];
/* Paired with READ_ONCE() in queue_cnt() */
WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
}
cnt = qcnt * sizeof(*event);
}
cnt = cnt * sizeof(struct ptp_extts_event);
result = cnt;
if (copy_to_user(buf, event, cnt)) {
if (copy_to_user(buf, event, cnt))
result = -EFAULT;
goto free_event;
}
free_event:
kfree(event);
exit:
return result;
}