From 169f03a064c230de6d715bdd62112eb12256fce3 Mon Sep 17 00:00:00 2001 From: Linus Walleij Date: Wed, 1 Feb 2017 13:47:57 +0100 Subject: [PATCH] mmc: block: return errorcode from mmc_sd_num_wr_blocks() mmc_sd_num_wr_blocks() has an interesting construction that saves one return argument by casting (u32)-1 as error code if something goes wrong. This is however a bit confusing when the normal kernel pattern is to return an int error code on success. So instead pass a variable "blocks" that the function can fill in with the number of successfully transferred blocks and return an integer as error code. Signed-off-by: Linus Walleij Signed-off-by: Ulf Hansson [Ulf: Changed a return code to -EIO, reported by Dan Carpenter and fixed by Linus Walleij] --- drivers/mmc/core/block.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c index 7f0b9af8229c..26191b8bea72 100644 --- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -763,7 +763,7 @@ static inline int mmc_blk_part_switch(struct mmc_card *card, return 0; } -static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) +static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks) { int err; u32 result; @@ -781,9 +781,9 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) err = mmc_wait_for_cmd(card->host, &cmd, 0); if (err) - return (u32)-1; + return err; if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) - return (u32)-1; + return -EIO; memset(&cmd, 0, sizeof(struct mmc_command)); @@ -803,7 +803,7 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) blocks = kmalloc(4, GFP_KERNEL); if (!blocks) - return (u32)-1; + return -ENOMEM; sg_init_one(&sg, blocks, 4); @@ -813,9 +813,11 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) kfree(blocks); if (cmd.error || data.error) - result = (u32)-1; + return -EIO; + + *written_blocks = result; - return result; + return 0; } static int get_card_status(struct mmc_card *card, u32 *status, int retries) @@ -1576,9 +1578,10 @@ static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card, */ if (mmc_card_sd(card)) { u32 blocks; + int err; - blocks = mmc_sd_num_wr_blocks(card); - if (blocks != (u32)-1) { + err = mmc_sd_num_wr_blocks(card, &blocks); + if (!err) { ret = blk_end_request(req, 0, blocks << 9); } } else { -- 2.20.1