From nobody Thu Oct 9 05:22:55 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B25492BDC26; Fri, 20 Jun 2025 13:24:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750425894; cv=none; b=uAe58dymYwiNsEV9ruQOzeCzZ5JZfxPMsVwTNDStotwvl02OqHL6vzsuHAov+RKkjh4CgQ6xcvDTCWJGIodpbCXIJz6NilgifRUSRuv6unhERq7pnS2MOK8zHa7vqdN5c1/XeptF548Hc+D8Y2LOiEGWjly7uTEuciZreb7drYM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750425894; c=relaxed/simple; bh=+yQNQVtDUDnZEDOwjEyTfF300+/7hA3mOBRzxQBCcdg=; h=Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type:Date; b=jihvObGZvhPnZ9qNRETGn4uI23/EIhVHPhUjHuE/Yd2ciYdyIFVOgH2YKYRXnr6Q1AXgc1wB+RoisEwTRTuQuXj6gXWTkMQqamqZ5rBXNQw8CnhgahKL+6syhypvW2BuOKKZ2Te4x6R/wHqyUYS/KZNSv4wzdqFsHIXSjkgG7ms= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=r3+6T9Em; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=N1+bRPVS; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="r3+6T9Em"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="N1+bRPVS" Message-ID: <20250620131944.533741574@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1750425891; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=t5AUZu+5N4DYRhjssasKvybcKzjmriU2anO1KoUYxkA=; b=r3+6T9EmTdlMc7zHSKMT4YJNIkDrBT/QGeXroAsFqe9mzsUuvfGsibYbtGKmC+P0B6NxmW GCucNVS+DkIVUBpmdzMDLgl+U0igiis5qIw/Qh6jaLMrle80+tXHrRArwLR0czMvpzgXu/ 2G4ZUk/+EJWsIRxdDtsfmxGwtJ/L5LPp1NQHaaZrTsCcRnV9npi0MhKOwNGyVtg+iiIdWM Qg9Eo/R69W2FYzDDF6ja9J3kSZT9RJkaZRt3KpkBVK17MoTZTTMDZ8+uW/WkiQDbaFmg8v oumC10BtXaSINmBMHr8+q1D6+FUd99UP9h/x8zD9Uh6/raFxSuhxKm3tSAqYsA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1750425891; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=t5AUZu+5N4DYRhjssasKvybcKzjmriU2anO1KoUYxkA=; b=N1+bRPVSrrVLcFrgOp8lStb1p3QF+9b7T+aBMDPYr8aDTI+2smDURGfm8L0qCIFdxIiwWv mqM09XOrzBo+X5Bg== From: Thomas Gleixner To: LKML Cc: Richard Cochran , netdev@vger.kernel.org Subject: [patch 13/13] ptp: Convert ptp_open/read() to __free() References: <20250620130144.351492917@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Fri, 20 Jun 2025 15:24:50 +0200 (CEST) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Get rid of the kfree() and goto maze and just return error codes directly. No functional change intended. Signed-off-by: Thomas Gleixner --- drivers/ptp/ptp_chardev.c | 70 ++++++++++++-----------------------------= ----- 1 file changed, 19 insertions(+), 51 deletions(-) --- a/drivers/ptp/ptp_chardev.c +++ b/drivers/ptp/ptp_chardev.c @@ -106,19 +106,17 @@ int ptp_set_pinfunc(struct ptp_clock *pt =20 int ptp_open(struct posix_clock_context *pccontext, fmode_t fmode) { - struct ptp_clock *ptp =3D - container_of(pccontext->clk, struct ptp_clock, clock); - struct timestamp_event_queue *queue; + struct ptp_clock *ptp =3D container_of(pccontext->clk, struct ptp_clock, = clock); + struct timestamp_event_queue *queue __free(kfree) =3D NULL; char debugfsname[32]; =20 queue =3D kzalloc(sizeof(*queue), GFP_KERNEL); if (!queue) return -EINVAL; queue->mask =3D bitmap_alloc(PTP_MAX_CHANNELS, GFP_KERNEL); - if (!queue->mask) { - kfree(queue); + if (!queue->mask) return -EINVAL; - } + bitmap_set(queue->mask, 0, PTP_MAX_CHANNELS); spin_lock_init(&queue->lock); scoped_guard(spinlock_irq, &ptp->tsevqs_lock) @@ -134,7 +132,6 @@ int ptp_open(struct posix_clock_context DIV_ROUND_UP(PTP_MAX_CHANNELS, BITS_PER_BYTE * sizeof(u32)); debugfs_create_u32_array("mask", 0444, queue->debugfs_instance, &queue->dfs_bitmap); - return 0; } =20 @@ -540,67 +537,38 @@ long ptp_ioctl(struct posix_clock_contex ssize_t ptp_read(struct posix_clock_context *pccontext, uint rdflags, char __user *buf, size_t cnt) { - struct ptp_clock *ptp =3D - container_of(pccontext->clk, struct ptp_clock, clock); - struct timestamp_event_queue *queue; - struct ptp_extts_event *event; - int result; + struct ptp_clock *ptp =3D container_of(pccontext->clk, struct ptp_clock, = clock); + struct timestamp_event_queue *queue =3D pccontext->private_clkdata; + struct ptp_extts_event *event __free(kfree) =3D NULL; =20 - queue =3D pccontext->private_clkdata; - if (!queue) { - result =3D -EINVAL; - goto exit; - } + if (!queue) + return -EINVAL; =20 - if (cnt % sizeof(struct ptp_extts_event) !=3D 0) { - result =3D -EINVAL; - goto exit; - } + if (cnt % sizeof(struct ptp_extts_event) !=3D 0) + return -EINVAL; =20 if (cnt > EXTTS_BUFSIZE) cnt =3D EXTTS_BUFSIZE; =20 - cnt =3D 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(queu= e))) return -ERESTARTSYS; - } =20 - if (ptp->defunct) { - result =3D -ENODEV; - goto exit; - } + if (ptp->defunct) + return -ENODEV; =20 event =3D kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); - if (!event) { - result =3D -ENOMEM; - goto exit; - } + if (!event) + return -ENOMEM; =20 scoped_guard(spinlock_irq, &queue->lock) { - size_t qcnt =3D queue_cnt(queue); - - if (cnt > qcnt) - cnt =3D qcnt; + size_t qcnt =3D min((size_t)queue_cnt(queue), cnt / sizeof(*event)); =20 - for (size_t i =3D 0; i < cnt; i++) { + for (size_t i =3D 0; i < qcnt; i++) { event[i] =3D queue->buf[queue->head]; /* Paired with READ_ONCE() in queue_cnt() */ WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS); } } =20 - cnt =3D cnt * sizeof(struct ptp_extts_event); - - result =3D cnt; - if (copy_to_user(buf, event, cnt)) { - result =3D -EFAULT; - goto free_event; - } - -free_event: - kfree(event); -exit: - return result; + return copy_to_user(buf, event, cnt) ? -EFAULT : cnt; }