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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: Simon Horman , Mark Brown , Liam Girdwood , Maxime Chevallier , Kyle Swenson , Ross Cawston , netdev-bot+sashiko@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Carlo Szelinsky Subject: [PATCH net v4 01/14] net: pse-pd: size the notification kfifo after defaulting nr_lines Date: Wed, 11 Nov 2026 22:17:18 +0100 Message-ID: <20261111211731.3193796-2-github@szelinsky.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20261111211731.3193796-1-github@szelinsky.de> References: <20261111211731.3193796-1-github@szelinsky.de> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit pse_controller_register() allocates the notification kfifo before it turns nr_lines == 0 into 1, and kfifo_alloc() fails for a size below 2. So a controller with nr_lines 0 or 1 cannot register. pse_regulator (podl-pse-regulator) never sets nr_lines, so its probe has failed with -EINVAL ever since the kfifo was added. Apply the default first, and allocate at least two entries. Triggered in QEMU (arm64) with a test-only PSE controller with nr_lines 0: its probe failed with "failed to allocate kfifo notifications". With this patch it registers. Fixes: ffef61d6d273 ("net: pse-pd: Add support for budget evaluation strategies") Reviewed-by: Kory Maincent Acked-by: Oleksij Rempel Signed-off-by: Carlo Szelinsky --- drivers/net/pse-pd/pse_core.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c index a5e6d7b26b9f..c0573cbbba5b 100644 --- a/drivers/net/pse-pd/pse_core.c +++ b/drivers/net/pse-pd/pse_core.c @@ -1044,16 +1044,19 @@ int pse_controller_register(struct pse_controller_dev *pcdev) mutex_init(&pcdev->lock); INIT_LIST_HEAD(&pcdev->pse_control_head); spin_lock_init(&pcdev->ntf_fifo_lock); - ret = kfifo_alloc(&pcdev->ntf_fifo, pcdev->nr_lines, GFP_KERNEL); + + if (!pcdev->nr_lines) + pcdev->nr_lines = 1; + + /* kfifo_alloc() rejects a size that rounds up to less than 2 */ + ret = kfifo_alloc(&pcdev->ntf_fifo, max(pcdev->nr_lines, 2U), + GFP_KERNEL); if (ret) { dev_err(pcdev->dev, "failed to allocate kfifo notifications\n"); return ret; } INIT_WORK(&pcdev->ntf_work, pse_send_ntf_worker); - if (!pcdev->nr_lines) - pcdev->nr_lines = 1; - if (!pcdev->ops->pi_get_admin_state || !pcdev->ops->pi_get_pw_status) { dev_err(pcdev->dev, -- 2.43.0