From patchwork Wed Nov 19 15:37:27 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Ferre X-Patchwork-Id: 5338251 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id AF4CD9F2ED for ; Wed, 19 Nov 2014 15:40:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B609120176 for ; Wed, 19 Nov 2014 15:40:06 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9613520172 for ; Wed, 19 Nov 2014 15:40:05 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Xr7KK-0006ff-Ty; Wed, 19 Nov 2014 15:37:52 +0000 Received: from eusmtp01.atmel.com ([212.144.249.243]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Xr7KG-0006bU-S7 for linux-arm-kernel@lists.infradead.org; Wed, 19 Nov 2014 15:37:50 +0000 Received: from tenerife.corp.atmel.com (10.161.101.13) by eusmtp01.atmel.com (10.161.101.31) with Microsoft SMTP Server id 14.2.347.0; Wed, 19 Nov 2014 16:37:21 +0100 From: Nicolas Ferre To: Subject: [RESEND PATCH] usb: gadget: at91_udc: move prepare clk into process context Date: Wed, 19 Nov 2014 16:37:27 +0100 Message-ID: <1416411447-31112-1-git-send-email-nicolas.ferre@atmel.com> X-Mailer: git-send-email 2.1.3 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141119_073749_257872_8740A556 X-CRM114-Status: GOOD ( 12.69 ) X-Spam-Score: -0.0 (/) Cc: Boris BREZILLON , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Felipe Balbi , Alexandre Belloni , stable@vger.kernel.org, ronald.wahl@raritan.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Ronald Wahl Commit 7628083227b6bc4a7e33d7c381d7a4e558424b6b (usb: gadget: at91_udc: prepare clk before calling enable) added clock preparation in interrupt context. This is not allowed as it might sleep. Also setting the clock rate is unsafe to call from there for the same reason. Move clock preparation and setting clock rate into process context (at91udc_probe). Signed-off-by: Ronald Wahl Acked-by: Alexandre Belloni Acked-by: Boris Brezillon Acked-by: Nicolas Ferre Cc: Felipe Balbi Cc: # v3.17+ --- Hi Felipe, I forgot to answer you on this patch. So I resend it now with the proper "stable" tag. You can also queue it during this -rc phase if you feel it is still possible. Thanks, bye. drivers/usb/gadget/udc/at91_udc.c | 44 ++++++++++++++++++++++++++++----------- 1 file changed, 32 insertions(+), 12 deletions(-) diff --git a/drivers/usb/gadget/udc/at91_udc.c b/drivers/usb/gadget/udc/at91_udc.c index 9968f5331fe4..0716c1994e28 100644 --- a/drivers/usb/gadget/udc/at91_udc.c +++ b/drivers/usb/gadget/udc/at91_udc.c @@ -870,12 +870,10 @@ static void clk_on(struct at91_udc *udc) return; udc->clocked = 1; - if (IS_ENABLED(CONFIG_COMMON_CLK)) { - clk_set_rate(udc->uclk, 48000000); - clk_prepare_enable(udc->uclk); - } - clk_prepare_enable(udc->iclk); - clk_prepare_enable(udc->fclk); + if (IS_ENABLED(CONFIG_COMMON_CLK)) + clk_enable(udc->uclk); + clk_enable(udc->iclk); + clk_enable(udc->fclk); } static void clk_off(struct at91_udc *udc) @@ -884,10 +882,10 @@ static void clk_off(struct at91_udc *udc) return; udc->clocked = 0; udc->gadget.speed = USB_SPEED_UNKNOWN; - clk_disable_unprepare(udc->fclk); - clk_disable_unprepare(udc->iclk); + clk_disable(udc->fclk); + clk_disable(udc->iclk); if (IS_ENABLED(CONFIG_COMMON_CLK)) - clk_disable_unprepare(udc->uclk); + clk_disable(udc->uclk); } /* @@ -1780,14 +1778,24 @@ static int at91udc_probe(struct platform_device *pdev) } /* don't do anything until we have both gadget driver and VBUS */ + if (IS_ENABLED(CONFIG_COMMON_CLK)) { + clk_set_rate(udc->uclk, 48000000); + retval = clk_prepare(udc->uclk); + if (retval) + goto fail1; + } + retval = clk_prepare(udc->fclk); + if (retval) + goto fail1a; + retval = clk_prepare_enable(udc->iclk); if (retval) - goto fail1; + goto fail1b; at91_udp_write(udc, AT91_UDP_TXVC, AT91_UDP_TXVC_TXVDIS); at91_udp_write(udc, AT91_UDP_IDR, 0xffffffff); /* Clear all pending interrupts - UDP may be used by bootloader. */ at91_udp_write(udc, AT91_UDP_ICR, 0xffffffff); - clk_disable_unprepare(udc->iclk); + clk_disable(udc->iclk); /* request UDC and maybe VBUS irqs */ udc->udp_irq = platform_get_irq(pdev, 0); @@ -1795,7 +1803,7 @@ static int at91udc_probe(struct platform_device *pdev) 0, driver_name, udc); if (retval < 0) { DBG("request irq %d failed\n", udc->udp_irq); - goto fail1; + goto fail1c; } if (gpio_is_valid(udc->board.vbus_pin)) { retval = gpio_request(udc->board.vbus_pin, "udc_vbus"); @@ -1848,6 +1856,13 @@ fail3: gpio_free(udc->board.vbus_pin); fail2: free_irq(udc->udp_irq, udc); +fail1c: + clk_unprepare(udc->iclk); +fail1b: + clk_unprepare(udc->fclk); +fail1a: + if (IS_ENABLED(CONFIG_COMMON_CLK)) + clk_unprepare(udc->uclk); fail1: if (IS_ENABLED(CONFIG_COMMON_CLK) && !IS_ERR(udc->uclk)) clk_put(udc->uclk); @@ -1896,6 +1911,11 @@ static int __exit at91udc_remove(struct platform_device *pdev) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); release_mem_region(res->start, resource_size(res)); + if (IS_ENABLED(CONFIG_COMMON_CLK)) + clk_unprepare(udc->uclk); + clk_unprepare(udc->fclk); + clk_unprepare(udc->iclk); + clk_put(udc->iclk); clk_put(udc->fclk); if (IS_ENABLED(CONFIG_COMMON_CLK))