mmc: enforce correct sg list
Now that we've fixed our only offender when it comes to strange sg
list, add a check so that future users keep the sg list proper with
regard to transfer size.
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 4a73e8b..e8f896c 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -99,6 +99,10 @@
void
mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
{
+#ifdef CONFIG_MMC_DEBUG
+ unsigned int i, sz;
+#endif
+
pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
mmc_hostname(host), mrq->cmd->opcode,
mrq->cmd->arg, mrq->cmd->flags);
@@ -113,6 +117,13 @@
BUG_ON(mrq->data->blocks * mrq->data->blksz >
host->max_req_size);
+#ifdef CONFIG_MMC_DEBUG
+ sz = 0;
+ for (i = 0;i < mrq->data->sg_len;i++)
+ sz += mrq->data->sg[i].length;
+ BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
+#endif
+
mrq->cmd->data = mrq->data;
mrq->data->error = 0;
mrq->data->mrq = mrq;