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authorLinus Walleij <linus.walleij@linaro.org>2017-02-01 13:47:57 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2017-02-14 09:07:59 +0100
commit169f03a064c230de6d715bdd62112eb12256fce3 (patch)
tree237a211bce3b429b0511040dac6f80b2cb33fe23 /drivers/mmc
parent9491be5ff06ff08d61e6a8d767382ea0037a6f38 (diff)
downloadlinux-169f03a064c230de6d715bdd62112eb12256fce3.tar.bz2
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 <linus.walleij@linaro.org> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> [Ulf: Changed a return code to -EIO, reported by Dan Carpenter and fixed by Linus Walleij]
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/block.c19
1 files 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 {