From patchwork Fri May 8 13:42:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sumit Semwal X-Patchwork-Id: 29619 Received: from mail.tu-berlin.de ([130.149.7.33]) by www.linuxtv.org with esmtp (Exim 4.72) (envelope-from ) id 1YqiZG-0001IY-JH; Fri, 08 May 2015 15:43:54 +0200 X-tubIT-Incoming-IP: 209.132.180.67 Received: from vger.kernel.org ([209.132.180.67]) by mail.tu-berlin.de (exim-4.76/mailfrontend-5) with esmtp id 1YqiZD-0004Tn-9F; Fri, 08 May 2015 15:43:53 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753413AbbEHNns (ORCPT + 1 other); Fri, 8 May 2015 09:43:48 -0400 Received: from mail-pd0-f178.google.com ([209.85.192.178]:36071 "EHLO mail-pd0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753286AbbEHNns (ORCPT ); Fri, 8 May 2015 09:43:48 -0400 Received: by pdea3 with SMTP id a3so84425738pde.3 for ; Fri, 08 May 2015 06:43:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=0w+WszmEym3mU8K5AF5lgtLkxXZe9CTXTIylxl1CeDI=; b=gNp73xLHAQByKmFLLlEdPe/W119Nr1wJhGqc1XCOfZJrMn4Xy6QoP3dfnoJ50bOJZI xmtZdKao1Y0Y7aNXU0Ry0uFlkkNV1Moze4l1rxpcfQkID4FGHWg9GWwNGg9WeelOlGag C3xlyhupiv0FMDRgl+wQybSkUPM4TNUqDRRkCn0fGHV9jUFHpw4WRjBXsus9O2NVcSlP LjQ6JIf/GaLQ5sPEhWu/4rl7zJu1ev/LiYFIA6GNIBHoCI5NZtr1ktnvshiRlBcYwkJr ItmGXuCfGrEBsL5f//u4vaQsjVTggJmuvGvfX6rT0i6o1KQFLsmcG7FXL2ZkBVmnw5D0 jYbw== X-Gm-Message-State: ALoCoQkERCkiDB7oP5yIVUbuhbEJ/J3Vzmti+Xr9PMzfd7F3XBBstvWgJ/xjp/YwdRIuEM1BGcfw X-Received: by 10.70.128.110 with SMTP id nn14mr6640669pdb.135.1431092577391; Fri, 08 May 2015 06:42:57 -0700 (PDT) Received: from ss-ubuntu.lan ([106.51.225.38]) by mx.google.com with ESMTPSA id wt1sm5314189pbc.4.2015.05.08.06.42.52 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 08 May 2015 06:42:56 -0700 (PDT) From: Sumit Semwal To: linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org, rmk+kernel@arm.linux.org.uk, airlied@linux.ie, kgene@kernel.org, thierry.reding@gmail.com, pawel@osciak.com, m.szyprowski@samsung.com, mchehab@osg.samsung.com, gregkh@linuxfoundation.org Cc: linaro-kernel@lists.linaro.org, robdclark@gmail.com, daniel@ffwll.ch, Sumit Semwal Subject: [PATCH v3] dma-buf: add ref counting for module as exporter Date: Fri, 8 May 2015 19:12:43 +0530 Message-Id: <1431092563-19799-1-git-send-email-sumit.semwal@linaro.org> X-Mailer: git-send-email 1.9.1 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-PMX-Version: 6.0.0.2142326, Antispam-Engine: 2.7.2.2107409, Antispam-Data: 2015.5.8.133618 X-PMX-Spam: Gauge=IIIIIIII, Probability=8%, Report=' MULTIPLE_RCPTS 0.1, HTML_00_01 0.05, HTML_00_10 0.05, BODY_SIZE_4000_4999 0, BODY_SIZE_5000_LESS 0, BODY_SIZE_7000_LESS 0, URI_ENDS_IN_HTML 0, __ANY_URI 0, __CP_URI_IN_BODY 0, __HAS_FROM 0, __HAS_MSGID 0, __HAS_X_MAILER 0, __HAS_X_MAILING_LIST 0, __MIME_TEXT_ONLY 0, __MULTIPLE_RCPTS_CC_X2 0, __MULTIPLE_RCPTS_TO_X5 0, __SANE_MSGID 0, __SUBJ_ALPHA_END 0, __TO_MALFORMED_2 0, __TO_NO_NAME 0, __URI_NO_WWW 0, __URI_NS , __YOUTUBE_RCVD 0' Add reference counting on a kernel module that exports dma-buf and implements its operations. This prevents the module from being unloaded while DMABUF file is in use. The original patch [1] was submitted by Tomasz Stanislawski, but this is a simpler way to do it. v3: call module_put() as late as possible, per gregkh's comment. v2: move owner to struct dma_buf, and use DEFINE_DMA_BUF_EXPORT_INFO macro to simplify the change. Signed-off-by: Sumit Semwal [1]: https://lkml.org/lkml/2012/8/8/163 Acked-by: Greg Kroah-Hartman --- drivers/dma-buf/dma-buf.c | 10 +++++++++- include/linux/dma-buf.h | 10 ++++++++-- 2 files changed, 17 insertions(+), 3 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index c5a9138a6a8d..63a9914e42b8 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -72,6 +73,7 @@ static int dma_buf_release(struct inode *inode, struct file *file) if (dmabuf->resv == (struct reservation_object *)&dmabuf[1]) reservation_object_fini(dmabuf->resv); + module_put(dmabuf->owner); kfree(dmabuf); return 0; } @@ -302,14 +304,20 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) return ERR_PTR(-EINVAL); } + if (!try_module_get(exp_info->owner)) + return ERR_PTR(-ENOENT); + dmabuf = kzalloc(alloc_size, GFP_KERNEL); - if (dmabuf == NULL) + if (!dmabuf) { + module_put(exp_info->owner); return ERR_PTR(-ENOMEM); + } dmabuf->priv = exp_info->priv; dmabuf->ops = exp_info->ops; dmabuf->size = exp_info->size; dmabuf->exp_name = exp_info->exp_name; + dmabuf->owner = exp_info->owner; init_waitqueue_head(&dmabuf->poll); dmabuf->cb_excl.poll = dmabuf->cb_shared.poll = &dmabuf->poll; dmabuf->cb_excl.active = dmabuf->cb_shared.active = 0; diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 2f0b431b73e0..f98bd7068d55 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -115,6 +115,8 @@ struct dma_buf_ops { * @attachments: list of dma_buf_attachment that denotes all devices attached. * @ops: dma_buf_ops associated with this buffer object. * @exp_name: name of the exporter; useful for debugging. + * @owner: pointer to exporter module; used for refcounting when exporter is a + * kernel module. * @list_node: node for dma_buf accounting and debugging. * @priv: exporter specific private data for this buffer object. * @resv: reservation object linked to this dma-buf @@ -129,6 +131,7 @@ struct dma_buf { unsigned vmapping_counter; void *vmap_ptr; const char *exp_name; + struct module *owner; struct list_head list_node; void *priv; struct reservation_object *resv; @@ -164,7 +167,8 @@ struct dma_buf_attachment { /** * struct dma_buf_export_info - holds information needed to export a dma_buf - * @exp_name: name of the exporting module - useful for debugging. + * @exp_name: name of the exporter - useful for debugging. + * @owner: pointer to exporter module - used for refcounting kernel module * @ops: Attach allocator-defined dma buf ops to the new buffer * @size: Size of the buffer * @flags: mode flags for the file @@ -176,6 +180,7 @@ struct dma_buf_attachment { */ struct dma_buf_export_info { const char *exp_name; + struct module *owner; const struct dma_buf_ops *ops; size_t size; int flags; @@ -187,7 +192,8 @@ struct dma_buf_export_info { * helper macro for exporters; zeros and fills in most common values */ #define DEFINE_DMA_BUF_EXPORT_INFO(a) \ - struct dma_buf_export_info a = { .exp_name = KBUILD_MODNAME } + struct dma_buf_export_info a = { .exp_name = KBUILD_MODNAME, \ + .owner = THIS_MODULE } /** * get_dma_buf - convenience wrapper for get_file.