From: Logan Gunthorpe <logang@deltatee.com>
To: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
        linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
        intel-gfx@lists.freedesktop.org, linux-raid@vger.kernel.org,
        linux-mmc@vger.kernel.org, linux-nvdimm@ml01.01.org,
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        megaraidlinux.pdl@broadcom.com, sparmaintainer@unisys.com,
        devel@driverdev.osuosl.org, target-devel@vger.kernel.org,
        netdev@vger.kernel.org, linux-rdma@vger.kernel.org,
        dm-devel@redhat.com
Cc: Christoph Hellwig <hch@lst.de>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>,
        Jens Axboe <axboe@kernel.dk>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Dan Williams <dan.j.williams@intel.com>,
        Ross Zwisler <ross.zwisler@linux.intel.com>,
        Matthew Wilcox <mawilcox@microsoft.com>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Stephen Bates <sbates@raithlin.com>,
        Logan Gunthorpe <logang@deltatee.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Ulf Hansson <ulf.hansson@linaro.org>
Date: Tue, 25 Apr 2017 12:21:03 -0600
Message-Id: <1493144468-22493-17-git-send-email-logang@deltatee.com>
In-Reply-To: <1493144468-22493-1-git-send-email-logang@deltatee.com>
References: <1493144468-22493-1-git-send-email-logang@deltatee.com>
Subject: [PATCH v2 16/21] mmc: sdhci: Make use of the new sg_map helper function
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1843
Lines: 58

Straightforward conversion, except due to the lack of an error path we
have to use SG_MAP_MUST_NOT_FAIL which may BUG_ON in certain cases
in the future.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ulf Hansson <ulf.hansson@linaro.org>
---
 drivers/mmc/host/sdhci.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ecd0d43..239507f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -513,15 +513,19 @@ static int sdhci_pre_dma_transfer(struct sdhci_host *host,
 	return sg_count;
 }
 
+/*
+ * Note this function may return PTR_ERR and must be checked.
+ */
 static char *sdhci_kmap_atomic(struct scatterlist *sg, unsigned long *flags)
 {
 	local_irq_save(*flags);
-	return kmap_atomic(sg_page(sg)) + sg->offset;
+	return sg_map(sg, 0, SG_KMAP_ATOMIC | SG_MAP_MUST_NOT_FAIL);
 }
 
-static void sdhci_kunmap_atomic(void *buffer, unsigned long *flags)
+static void sdhci_kunmap_atomic(struct scatterlist *sg, void *buffer,
+				unsigned long *flags)
 {
-	kunmap_atomic(buffer);
+	sg_unmap(sg, buffer, 0, SG_KMAP_ATOMIC);
 	local_irq_restore(*flags);
 }
 
@@ -585,7 +589,7 @@ static void sdhci_adma_table_pre(struct sdhci_host *host,
 			if (data->flags & MMC_DATA_WRITE) {
 				buffer = sdhci_kmap_atomic(sg, &flags);
 				memcpy(align, buffer, offset);
-				sdhci_kunmap_atomic(buffer, &flags);
+				sdhci_kunmap_atomic(sg, buffer, &flags);
 			}
 
 			/* tran, valid */
@@ -663,7 +667,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
 
 					buffer = sdhci_kmap_atomic(sg, &flags);
 					memcpy(buffer, align, size);
-					sdhci_kunmap_atomic(buffer, &flags);
+					sdhci_kunmap_atomic(sg, buffer, &flags);
 
 					align += SDHCI_ADMA2_ALIGN;
 				}
-- 
2.1.4