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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2006-09-24 10:46:43 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-09-24 10:46:43 +0100 |
| commit | 2ed6d22cec37d9a3df4c5bacf1160dee7700106e (patch) | |
| tree | 4623ce1d0aa0f22c5b65ff7014034f24df13e5cc /drivers/mmc/mmc_block.c | |
| parent | 42431acbac43eb47c774c29d370f5c59136805bf (diff) | |
| download | linux-2ed6d22cec37d9a3df4c5bacf1160dee7700106e.tar.gz linux-2ed6d22cec37d9a3df4c5bacf1160dee7700106e.tar.bz2 linux-2ed6d22cec37d9a3df4c5bacf1160dee7700106e.zip | |
[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>
Diffstat (limited to 'drivers/mmc/mmc_block.c')
| -rw-r--r-- | drivers/mmc/mmc_block.c | 38 |
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. |