[MMC] Don't check READY_FOR_DATA when reading

There's no point checking to see if the card is ready to accept
data when we're reading from it - sending the command only wastes
precious bus bandwidth.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 20 insertions, 18 deletions

diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 8d18b87bfd34..db0e8ad439a5 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -231,27 +231,29 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
                         goto cmd_err;
                 }
 
-                do {
-                        int err;
-
-                        cmd.opcode = MMC_SEND_STATUS;
-                        cmd.arg = card->rca << 16;
-                        cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
-                        err = mmc_wait_for_cmd(card->host, &cmd, 5);
-                        if (err) {
-                                printk(KERN_ERR "%s: error %d requesting status\n",
-                                       req->rq_disk->disk_name, err);
-                                goto cmd_err;
-                        }
-                } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
+                if (rq_data_dir(req) != READ) {
+                        do {
+                                int err;
+
+                                cmd.opcode = MMC_SEND_STATUS;
+                                cmd.arg = card->rca << 16;
+                                cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
+                                err = mmc_wait_for_cmd(card->host, &cmd, 5);
+                                if (err) {
+                                        printk(KERN_ERR "%s: error %d requesting status\n",
+                                               req->rq_disk->disk_name, err);
+                                        goto cmd_err;
+                                }
+                        } while (!(cmd.resp[0] & R1_READY_FOR_DATA));
 
 #if 0
-                if (cmd.resp[0] & ~0x00000900)
-                        printk(KERN_ERR "%s: status = %08x\n",
-                               req->rq_disk->disk_name, cmd.resp[0]);
-                if (mmc_decode_status(cmd.resp))
-                        goto cmd_err;
+                        if (cmd.resp[0] & ~0x00000900)
+                                printk(KERN_ERR "%s: status = %08x\n",
+                                       req->rq_disk->disk_name, cmd.resp[0]);
+                        if (mmc_decode_status(cmd.resp))
+                                goto cmd_err;
 #endif
+                }
 
                 /*
                  * A block was successfully transferred.