From mboxrd@z Thu Jan 1 00:00:00 1970 From: Logan Gunthorpe Subject: [PATCH 18/22] mmc: spi: Make use of the new sg_map helper function Date: Thu, 13 Apr 2017 16:05:31 -0600 Message-ID: <1492121135-4437-19-git-send-email-logang@deltatee.com> References: <1492121135-4437-1-git-send-email-logang@deltatee.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1492121135-4437-1-git-send-email-logang-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Christoph Hellwig , "Martin K. Petersen" , Sagi Grimberg , Jens Axboe , Tejun Heo , Greg Kroah-Hartman , Dan Williams , Ross Zwisler , Matthew Wilcox , Sumit Semwal , Ming Lin , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-media-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linaro-mm-sig-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, intel-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, linux-raid-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org, linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, fcoe-devel-s9riP+hp16TNLxjTenLetw@public.gmane.org, open-iscsi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org, megaraidlinux.pdl-dY08KVG/lbpWk0Htik3J/w@public.gmane.org, sparmaintainer-GLv8BlqOqDDQT0dZR+AlfA@public.gmane.org, devel@driverd Cc: Steve Wise List-Id: linux-raid.ids We use the sg_map helper but it's slightly more complicated as we only check for the error when the mapping actually gets used. Such that if the mapping failed but wasn't needed then no error occurs. Signed-off-by: Logan Gunthorpe --- drivers/mmc/host/mmc_spi.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index e77d79c..82f786d 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -676,9 +676,15 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t, struct scratch *scratch = host->data; u32 pattern; - if (host->mmc->use_spi_crc) + if (host->mmc->use_spi_crc) { + if (IS_ERR(t->tx_buf)) + return PTR_ERR(t->tx_buf); + scratch->crc_val = cpu_to_be16( crc_itu_t(0, t->tx_buf, t->len)); + t->tx_buf += t->len; + } + if (host->dma_dev) dma_sync_single_for_device(host->dma_dev, host->data_dma, sizeof(*scratch), @@ -743,7 +749,6 @@ mmc_spi_writeblock(struct mmc_spi_host *host, struct spi_transfer *t, return status; } - t->tx_buf += t->len; if (host->dma_dev) t->tx_dma += t->len; @@ -809,6 +814,11 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t, } leftover = status << 1; + if (bitshift || host->mmc->use_spi_crc) { + if (IS_ERR(t->rx_buf)) + return PTR_ERR(t->rx_buf); + } + if (host->dma_dev) { dma_sync_single_for_device(host->dma_dev, host->data_dma, sizeof(*scratch), @@ -860,9 +870,10 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t, scratch->crc_val, crc, t->len); return -EILSEQ; } + + t->rx_buf += t->len; } - t->rx_buf += t->len; if (host->dma_dev) t->rx_dma += t->len; @@ -936,11 +947,11 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd, } /* allow pio too; we don't allow highmem */ - kmap_addr = kmap(sg_page(sg)); + kmap_addr = sg_map(sg, SG_KMAP); if (direction == DMA_TO_DEVICE) - t->tx_buf = kmap_addr + sg->offset; + t->tx_buf = kmap_addr; else - t->rx_buf = kmap_addr + sg->offset; + t->rx_buf = kmap_addr; /* transfer each block, and update request status */ while (length) { @@ -970,7 +981,8 @@ mmc_spi_data_do(struct mmc_spi_host *host, struct mmc_command *cmd, /* discard mappings */ if (direction == DMA_FROM_DEVICE) flush_kernel_dcache_page(sg_page(sg)); - kunmap(sg_page(sg)); + if (!IS_ERR(kmap_addr)) + sg_unmap(sg, kmap_addr, SG_KMAP); if (dma_dev) dma_unmap_page(dma_dev, dma_addr, PAGE_SIZE, dir); -- 2.1.4