4 files changed, 57 insertions, 25 deletions

diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
index bf4bc6adcfef..7471d49909b2 100644
--- a/drivers/mmc/core/mmc_ops.c
+++ b/drivers/mmc/core/mmc_ops.c
@@ -267,15 +267,26 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 
 int mmc_send_csd(struct mmc_card *card, u32 *csd)
 {
+        int ret, i;
+
         if (!mmc_host_is_spi(card->host))
                 return mmc_send_cxd_native(card->host, card->rca << 16,
                                 csd, MMC_SEND_CSD);
 
-        return mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
+        ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
+        if (ret)
+                return ret;
+
+        for (i = 0;i < 4;i++)
+                csd[i] = be32_to_cpu(csd[i]);
+
+        return 0;
 }
 
 int mmc_send_cid(struct mmc_host *host, u32 *cid)
 {
+        int ret, i;
+
         if (!mmc_host_is_spi(host)) {
                 if (!host->card)
                         return -EINVAL;
@@ -283,7 +294,14 @@ int mmc_send_cid(struct mmc_host *host, u32 *cid)
                                 cid, MMC_SEND_CID);
         }
 
-        return mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
+        ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
+        if (ret)
+                return ret;
+
+        for (i = 0;i < 4;i++)
+                cid[i] = be32_to_cpu(cid[i]);
+
+        return 0;
 }
 
 int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index ee4029a24efd..a6dafe62b992 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -294,8 +294,8 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
         if (data.error)
                 return data.error;
 
-        scr[0] = ntohl(scr[0]);
-        scr[1] = ntohl(scr[1]);
+        scr[0] = be32_to_cpu(scr[0]);
+        scr[1] = be32_to_cpu(scr[1]);
 
         return 0;
 }
diff --git a/drivers/mmc/host/au1xmmc.c b/drivers/mmc/host/au1xmmc.c
index c77fadc0dfa3..b2104d4f87af 100644
--- a/drivers/mmc/host/au1xmmc.c
+++ b/drivers/mmc/host/au1xmmc.c
@@ -212,12 +212,12 @@ static int au1xmmc_send_command(struct au1xmmc_host *host, int wait,
         }
 
         if (data) {
-                if (flags & MMC_DATA_READ) {
+                if (data->flags & MMC_DATA_READ) {
                         if (data->blocks > 1)
                                 mmccmd |= SD_CMD_CT_4;
                         else
                                 mmccmd |= SD_CMD_CT_2;
-                } else if (flags & MMC_DATA_WRITE) {
+                } else if (data->flags & MMC_DATA_WRITE) {
                         if (data->blocks > 1)
                                 mmccmd |= SD_CMD_CT_3;
                         else
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 12c2d807c145..a6469218f194 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -1165,6 +1165,23 @@ mmc_spi_detect_irq(int irq, void *mmc)
         return IRQ_HANDLED;
 }
 
+struct count_children {
+        unsigned        n;
+        struct bus_type *bus;
+};
+
+static int maybe_count_child(struct device *dev, void *c)
+{
+        struct count_children *ccp = c;
+
+        if (dev->bus == ccp->bus) {
+                if (ccp->n)
+                        return -EBUSY;
+                ccp->n++;
+        }
+        return 0;
+}
+
 static int mmc_spi_probe(struct spi_device *spi)
 {
         void                    *ones;
@@ -1188,33 +1205,30 @@ static int mmc_spi_probe(struct spi_device *spi)
                 return status;
         }
 
-        /* We can use the bus safely iff nobody else will interfere with
-         * us.  That is, either we have the experimental exclusive access
-         * primitives ... or else there's nobody to share it with.
+        /* We can use the bus safely iff nobody else will interfere with us.
+         * Most commands consist of one SPI message to issue a command, then
+         * several more to collect its response, then possibly more for data
+         * transfer.  Clocking access to other devices during that period will
+         * corrupt the command execution.
+         *
+         * Until we have software primitives which guarantee non-interference,
+         * we'll aim for a hardware-level guarantee.
+         *
+         * REVISIT we can't guarantee another device won't be added later...
          */
         if (spi->master->num_chipselect > 1) {
-                struct device   *parent = spi->dev.parent;
+                struct count_children cc;
 
-                /* If there are multiple devices on this bus, we
-                 * can't proceed.
-                 */
-                spin_lock(&parent->klist_children.k_lock);
-                if (parent->klist_children.k_list.next
-                                != parent->klist_children.k_list.prev)
-                        status = -EMLINK;
-                else
-                        status = 0;
-                spin_unlock(&parent->klist_children.k_lock);
+                cc.n = 0;
+                cc.bus = spi->dev.bus;
+                status = device_for_each_child(spi->dev.parent, &cc,
+                                maybe_count_child);
                 if (status < 0) {
                         dev_err(&spi->dev, "can't share SPI bus\n");
                         return status;
                 }
 
-                /* REVISIT we can't guarantee another device won't
-                 * be added later.  It's uncommon though ... for now,
-                 * work as if this is safe.
-                 */
-                dev_warn(&spi->dev, "ASSUMING unshared SPI bus!\n");
+                dev_warn(&spi->dev, "ASSUMING SPI bus stays unshared!\n");
         }
 
         /* We need a supply of ones to transmit.  This is the only time