From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0862E302CA6; Tue, 26 Aug 2025 14:01:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756216917; cv=none; b=HKjpDYcnHyZKpXQm4iLVsXBLmj7dTxlCubaWX9FVySsY7V7ewfBR61TfOZsBsOlDMBWJnOBF55s6gLp0SqXC7pehZ1qWuLQRZ68br87tEy7LdRFwnTScnMFXJVzkqWaHrIY8O2jWDdbi3G6NEZOKSMfM+6V/S3mVa3Zkxxn+zLc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756216917; c=relaxed/simple; bh=b+fPghA4CjEZrOOtvDyMayoyWUNyS9XWgp6oRSG//qc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mtvMuu0ywJXVVztUSjHx5LJqVk/i4G+0kxBe/IhvYteyRwmoOruGpfY8UUmKvHpUYIt9g76FPU8X0jKgjGaWvw0/l8enwd/xcJ2ogiCVvB14YblfreFUOcS1rikqr+9HLs1dBP5j929fHWVL+TkazCO7pHJBWixVwxtNGYLl/p0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FbRGaEvM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="FbRGaEvM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 92D80C113CF; Tue, 26 Aug 2025 14:01:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756216916; bh=b+fPghA4CjEZrOOtvDyMayoyWUNyS9XWgp6oRSG//qc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FbRGaEvMOUFzAgYJgPNvU7oqcGZ+p6tLb4oFrfj4+P8DxFffRkuWsefrJ5XjJ5K+K qZrIn3PXaum/lCcvumejNbqQFtiGlvKm4Agu4NuBFXm2EWw6F9v09XFLVd6Jq+zm26 kit/QQw/BwcMR1K/N0Teh3+ih24hl2pmAJ8Zx7I4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Akash M , Selvarasu Ganesan , Thinh Nguyen , Sebastian Andrzej Siewior Subject: [PATCH 5.15 591/644] usb: dwc3: Remove WARN_ON for device endpoint command timeouts Date: Tue, 26 Aug 2025 13:11:22 +0200 Message-ID: <20250826111001.183394807@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110946.507083938@linuxfoundation.org> References: <20250826110946.507083938@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Selvarasu Ganesan commit 45eae113dccaf8e502090ecf5b3d9e9b805add6f upstream. This commit addresses a rarely observed endpoint command timeout which causes kernel panic due to warn when 'panic_on_warn' is enabled and unnecessary call trace prints when 'panic_on_warn' is disabled. It is seen during fast software-controlled connect/disconnect testcases. The following is one such endpoint command timeout that we observed: 1. Connect ======= ->dwc3_thread_interrupt ->dwc3_ep0_interrupt ->configfs_composite_setup ->composite_setup ->usb_ep_queue ->dwc3_gadget_ep0_queue ->__dwc3_gadget_ep0_queue ->__dwc3_ep0_do_control_data ->dwc3_send_gadget_ep_cmd 2. Disconnect ========== ->dwc3_thread_interrupt ->dwc3_gadget_disconnect_interrupt ->dwc3_ep0_reset_state ->dwc3_ep0_end_control_data ->dwc3_send_gadget_ep_cmd In the issue scenario, in Exynos platforms, we observed that control transfers for the previous connect have not yet been completed and end transfer command sent as a part of the disconnect sequence and processing of USB_ENDPOINT_HALT feature request from the host timeout. This maybe an expected scenario since the controller is processing EP commands sent as a part of the previous connect. It maybe better to remove WARN_ON in all places where device endpoint commands are sent to avoid unnecessary kernel panic due to warn. Cc: stable Co-developed-by: Akash M Signed-off-by: Akash M Signed-off-by: Selvarasu Ganesan Acked-by: Thinh Nguyen Reviewed-by: Sebastian Andrzej Siewior Link: https://lore.kernel.org/r/20250808125315.1607-1-selvarasu.g@samsung.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/ep0.c | 20 ++++++++++++++++---- drivers/usb/dwc3/gadget.c | 10 ++++++++-- 2 files changed, 24 insertions(+), 6 deletions(-) --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -282,7 +282,9 @@ void dwc3_ep0_out_start(struct dwc3 *dwc dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8, DWC3_TRBCTL_CONTROL_SETUP, false); ret = dwc3_ep0_start_trans(dep); - WARN_ON(ret < 0); + if (ret < 0) + dev_err(dwc->dev, "ep0 out start transfer failed: %d\n", ret); + for (i = 2; i < DWC3_ENDPOINTS_NUM; i++) { struct dwc3_ep *dwc3_ep; @@ -1050,7 +1052,9 @@ static void __dwc3_ep0_do_control_data(s ret = dwc3_ep0_start_trans(dep); } - WARN_ON(ret < 0); + if (ret < 0) + dev_err(dwc->dev, + "ep0 data phase start transfer failed: %d\n", ret); } static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) @@ -1067,7 +1071,12 @@ static int dwc3_ep0_start_control_status static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep) { - WARN_ON(dwc3_ep0_start_control_status(dep)); + int ret; + + ret = dwc3_ep0_start_control_status(dep); + if (ret) + dev_err(dwc->dev, + "ep0 status phase start transfer failed: %d\n", ret); } static void dwc3_ep0_do_control_status(struct dwc3 *dwc, @@ -1109,7 +1118,10 @@ void dwc3_ep0_end_control_data(struct dw cmd |= DWC3_DEPCMD_PARAM(dep->resource_index); memset(¶ms, 0, sizeof(params)); ret = dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); - WARN_ON_ONCE(ret); + if (ret) + dev_err_ratelimited(dwc->dev, + "ep0 data phase end transfer failed: %d\n", ret); + dep->resource_index = 0; } --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1693,7 +1693,11 @@ static int __dwc3_stop_active_transfer(s dep->flags |= DWC3_EP_DELAY_STOP; return 0; } - WARN_ON_ONCE(ret); + + if (ret) + dev_err_ratelimited(dep->dwc->dev, + "end transfer failed: %d\n", ret); + dep->resource_index = 0; if (!interrupt) { @@ -3835,7 +3839,9 @@ static void dwc3_clear_stall_all_ep(stru dep->flags &= ~DWC3_EP_STALL; ret = dwc3_send_clear_stall_ep_cmd(dep); - WARN_ON_ONCE(ret); + if (ret) + dev_err_ratelimited(dwc->dev, + "failed to clear STALL on %s\n", dep->name); } }