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Thu, 23 Mar 2017 07:45:52 +0000 (GMT) From: Marek Szyprowski To: linux-samsung-soc@vger.kernel.org, linux-serial@vger.kernel.org Cc: Marek Szyprowski , Sylwester Nawrocki , Krzysztof Kozlowski , Bartlomiej Zolnierkiewicz , Greg Kroah-Hartman , Seung-Woo Kim , Joonyoung Shim , Inki Dae , stable@vger.kernel.org Subject: [PATCH 2/2] serial: samsung: Add missing checks for dma_map_single failure Date: Thu, 23 Mar 2017 08:45:22 +0100 Message-id: <1490255131-9597-2-git-send-email-m.szyprowski@samsung.com> X-Mailer: git-send-email 1.9.1 In-reply-to: <1490255131-9597-1-git-send-email-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOIsWRmVeSWpSXmKPExsWy7djPc7qGtZcjDJ4v0LDYOGM9q0Xz4vVs FpPuT2CxeHHvIovF+fMb2C1mnN/HZHFmcS+7xdojd9ktDr9pZ7VYsPERo8WMyS/ZHLg9Nq3q ZPPYP3cNu0ffllWMHp83yQWwRHHZpKTmZJalFunbJXBlfP9ynrWgXbyid/pk5gbGjcJdjJwc EgImEucvnmOBsMUkLtxbzwZiCwksZZQ4vEO0i5ELyP7MKPHu9BcmmIbXk+ayQSSWMUrcebIe ymlgkvi0/BMjSBWbgKFE19susFEiAs4Ss88uZAIpYhb4zySx4NMhdpCEsECoxP21S8AaWARU JU7/eMEKYvMKuEt8f7adGWKdnMTJY5PB4pwCHhJHP6yFOqOdXWL5Jc4uRg4gW1Zi0wGocheJ 9nfbWCFsYYlXx7ewQ9gyEp0dB6Fa+xklmlq1IewZjBLn3vJC2NYSh49fBOtlFuCTmLRtOjPE eF6JjjYhiBIPiVWdl9ggbEeJXx0g74L8PptR4vrLa+wTGGUWMDKsYhRJLS3OTU8tNtIrTswt Ls1L10vOz93ECIzu0/+Of9zB+P6E1SFGAQ5GJR7eiJpLEUKsiWXFlbmHGCU4mJVEeG0LL0cI 8aYkVlalFuXHF5XmpBYfYpTmYFES592z4Eq4kEB6YklqdmpqQWoRTJaJg1OqgTHpgk+F/9I5 nSldU8ympO+Zb8B+J8+g6E/e+34P2wftjw2vStgf6pxu3X1IM0Zs2spEmdIMFqV81m+d4UVf jJgblnI2Z8bukPvtEJIc9aLQl9tUYnNtg+Xbre+zHzGubms+vij8fMrdmPLZtwVuxJ+8fj16 Tsis2ZxrY0In3DU+5nXk1wLPZCWW4oxEQy3mouJEAN9WqzDqAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrBLMWRmVeSWpSXmKPExsVy+t/xK7pzai9HGCy7am2xccZ6VovmxevZ LCbdn8Bi8eLeRRaL8+c3sFvMOL+PyeLM4l52i7VH7rJbHH7TzmqxYOMjRosZk1+yOXB7bFrV yeaxf+4ado++LasYPT5vkgtgiXKzyUhNTEktUkjNS85PycxLt1UKDXHTtVBSyEvMTbVVitD1 DQlSUihLzCkF8owM0ICDc4B7sJK+XYJbxvcv51kL2sUreqdPZm5g3CjcxcjJISFgIvF60lw2 CFtM4sK99UA2F4eQwBJGidcfbjOCJIQEmpgkZv4PArHZBAwlut52gTWICDhLzD67kAmkgVmg mVli597XTCAJYYFQiftrl4A1swioSpz+8YIVxOYVcJf4/mw7M8Q2OYmTxyaDxTkFPCSOfljL BLHMXeLly3PsExh5FzAyrGIUSS0tzk3PLTbUK07MLS7NS9dLzs/dxAgM9W3Hfm7ewXhpY/Ah RgEORiUe3oiaSxFCrIllxZW5hxglOJiVRHhtCy9HCPGmJFZWpRblxxeV5qQWH2I0BTpqIrOU aHI+MA7zSuINTQzNLQ2NjC0szI2MlMR5Sz5cCRcSSE8sSc1OTS1ILYLpY+LglGpg9BK3WrWB 41Le1u0Vlb3OyX9XFEedeWCRfSe16N0v/WUZR33UPDJbjjmmsbXt3P7aq/r58szaj8fP917z uuP3w3X6eu4fp/44HHsptq5i6SPfO0VfDr46vTnk6pdUx+AN0jnua22mS86Ocf3Oz+XbIJXl Uhsruv/qtbuOq//NvRfma3X6RWXeaSWW4oxEQy3mouJEALXMpgaLAgAA X-MTR: 20000000000000000@CPGS X-CMS-MailID: 20170323074553eucas1p110829c4ad1570104297df39c02cc59e5 X-Msg-Generator: CA X-Sender-IP: 182.198.249.179 X-Local-Sender: =?utf-8?q?Marek_Szyprowski=1BSRPOL-Kernel_=28TP=29=1B?= =?utf-8?b?7IK87ISx7KCE7J6QG1NlbmlvciBTb2Z0d2FyZSBFbmdpbmVlcg==?= X-Global-Sender: =?utf-8?q?Marek_Szyprowski=1BSRPOL-Kernel_=28TP=29=1BSam?= =?utf-8?q?sung_Electronics=1BSenior_Software_Engineer?= X-Sender-Code: =?utf-8?q?C10=1BEHQ=1BC10CD02CD027392?= CMS-TYPE: 201P X-HopCount: 7 X-CMS-RootMailID: 20170323074553eucas1p110829c4ad1570104297df39c02cc59e5 X-RootMTR: 20170323074553eucas1p110829c4ad1570104297df39c02cc59e5 References: <1490255131-9597-1-git-send-email-m.szyprowski@samsung.com> Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This patch adds missing checks for dma_map_single() failure and proper error reporting. While touching this part of the code, it also removes unnecessary spinlock calls around dma_map_single() for TX buffer. This finally solves all the issues reported by DMA API debug framework. Reported-by: Seung-Woo Kim Fixes: 2c37eedb74c8 ("serial: samsung: add dma reqest/release functions") CC: stable@vger.kernel.org # v4.10+ Signed-off-by: Marek Szyprowski --- This issue was there since adding DMA support, but this patch applies cleanly only to v4.10+ kernels due to other changes in the surrounding code. --- drivers/tty/serial/samsung.c | 35 ++++++++++++++++++++++++----------- 1 file changed, 24 insertions(+), 11 deletions(-) -- 1.9.1 Reviewed-by: Bartlomiej Zolnierkiewicz diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c index 9f3759bdb44f..8aca18c4cdea 100644 --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -859,7 +859,7 @@ static void s3c24xx_serial_break_ctl(struct uart_port *port, int break_state) static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) { struct s3c24xx_uart_dma *dma = p->dma; - unsigned long flags; + int ret; /* Default slave configuration parameters */ dma->rx_conf.direction = DMA_DEV_TO_MEM; @@ -884,8 +884,8 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) dma->tx_chan = dma_request_chan(p->port.dev, "tx"); if (IS_ERR(dma->tx_chan)) { - dma_release_channel(dma->rx_chan); - return PTR_ERR(dma->tx_chan); + ret = PTR_ERR(dma->tx_chan); + goto err_release_rx; } dmaengine_slave_config(dma->tx_chan, &dma->tx_conf); @@ -894,25 +894,38 @@ static int s3c24xx_serial_request_dma(struct s3c24xx_uart_port *p) dma->rx_size = PAGE_SIZE; dma->rx_buf = kmalloc(dma->rx_size, GFP_KERNEL); - if (!dma->rx_buf) { - dma_release_channel(dma->rx_chan); - dma_release_channel(dma->tx_chan); - return -ENOMEM; + ret = -ENOMEM; + goto err_release_tx; } dma->rx_addr = dma_map_single(p->port.dev, dma->rx_buf, dma->rx_size, DMA_FROM_DEVICE); - - spin_lock_irqsave(&p->port.lock, flags); + if (dma_mapping_error(p->port.dev, dma->rx_addr)) { + ret = -EIO; + goto err_free_rx; + } /* TX buffer */ dma->tx_addr = dma_map_single(p->port.dev, p->port.state->xmit.buf, UART_XMIT_SIZE, DMA_TO_DEVICE); - - spin_unlock_irqrestore(&p->port.lock, flags); + if (dma_mapping_error(p->port.dev, dma->tx_addr)) { + ret = -EIO; + goto err_unmap_rx; + } return 0; + +err_unmap_rx: + dma_unmap_single(p->port.dev, dma->rx_addr, dma->rx_size, + DMA_FROM_DEVICE); +err_free_rx: + kfree(dma->rx_buf); +err_release_tx: + dma_release_channel(dma->tx_chan); +err_release_rx: + dma_release_channel(dma->rx_chan); + return ret; } static void s3c24xx_serial_release_dma(struct s3c24xx_uart_port *p)