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Wed, 14 Jul 2021 05:30:06 -0700 Received: from MTKMBS01N2.mediatek.inc (172.21.101.79) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 05:30:04 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs01n2.mediatek.inc (172.21.101.79) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 20:29:56 +0800 Received: from mszswglt01.gcn.mediatek.inc (10.16.20.20) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 14 Jul 2021 20:29:56 +0800 From: To: Sumit Semwal , =?utf-8?q?Christian_K=C3=B6nig?= , Matthias Brugger , "open list:DMA BUFFER SHARING FRAMEWORK" , "open list:DMA BUFFER SHARING FRAMEWORK" , "moderated list:DMA BUFFER SHARING FRAMEWORK" , open list , "moderated list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" CC: , , Guangming Cao Subject: [PATCH] dma-buf: support users to change dma_buf.name Date: Wed, 14 Jul 2021 20:29:54 +0800 Message-ID: <20210714122954.71931-1-guangming.cao@mediatek.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_053007_613346_75BCF0E6 X-CRM114-Status: GOOD ( 15.14 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Guangming Cao User space user can call DMA_BUF_SET_NAME to set dma_buf.name, also add a kernel api for users to do same thing at kernel side. Signed-off-by: Guangming Cao --- drivers/dma-buf/dma-buf.c | 28 ++++++++++++++++++++++------ include/linux/dma-buf.h | 1 + 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 511fe0d217a0..949af232c644 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -331,20 +331,20 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll) * purpose between different devices. * * @dmabuf: [in] dmabuf buffer that will be renamed. - * @buf: [in] A piece of userspace memory that contains the name of + * @buf: [in] A piece of memory that contains the name of * the dma-buf. * * Returns 0 on success. If the dma-buf buffer is already attached to * devices, return -EBUSY. * */ -static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf) +long dma_buf_set_name(struct dma_buf *dmabuf, const char *buf) { - char *name = strndup_user(buf, DMA_BUF_NAME_LEN); + char *name = kstrndup(buf, DMA_BUF_NAME_LEN, GFP_KERNEL); long ret = 0; - if (IS_ERR(name)) - return PTR_ERR(name); + if (!name) + return -ENOMEM; dma_resv_lock(dmabuf->resv, NULL); if (!list_empty(&dmabuf->attachments)) { @@ -361,6 +361,22 @@ static long dma_buf_set_name(struct dma_buf *dmabuf, const char __user *buf) dma_resv_unlock(dmabuf->resv); return ret; } +EXPORT_SYMBOL_GPL(dma_buf_set_name); + +static long +dma_buf_set_name_user(struct dma_buf *dmabuf, const char __user *buf) +{ + char *name = strndup_user(buf, DMA_BUF_NAME_LEN); + long ret = 0; + + if (IS_ERR(name)) + return PTR_ERR(name); + + ret = dma_buf_set_name(dmabuf, name); + kfree(name); + + return ret; +} static long dma_buf_ioctl(struct file *file, unsigned int cmd, unsigned long arg) @@ -403,7 +419,7 @@ static long dma_buf_ioctl(struct file *file, case DMA_BUF_SET_NAME_A: case DMA_BUF_SET_NAME_B: - return dma_buf_set_name(dmabuf, (const char __user *)arg); + return dma_buf_set_name_user(dmabuf, (const char __user *)arg); default: return -ENOTTY; diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index efdc56b9d95f..e6612ab59a59 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, unsigned long); int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map); void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map); +long dma_buf_set_name(struct dma_buf *dmabuf, const char *name); #endif /* __DMA_BUF_H__ */