mmc: block: remove the check of packed for packed request routine
packed should always exist without calling its cleanup function
explicitly. Moreover, we have use it when preparing packed list.
So I don't believe we should ever fall into this check again when
doing mmc_blk_packed_hdr_wrq_prep or mmc_blk_end_packed_req,etc.
And the code of mmc_blk_end_packed_req is trying to use packed before
checking it which makes it quite weird. This patch is trying to
remove these two checks and move it to the mmc_blk_prep_packed_list.
If we find packed is null, then we should never use MMC_BLK_PACKED_CMD.
By doing this, we could fall back to non-packed request if finding null
packed, though it's impossible theoretically.
After removing these two BUG_ONs, we also remove all other similar
checks within the routine of mmc_blk_issue_rw_rq which checks the
error handling of packed request.
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 2206d44..74c7625 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -142,8 +142,6 @@
{
struct mmc_packed *packed = mqrq->packed;
- BUG_ON(!packed);
-
mqrq->cmd_type = MMC_PACKED_NONE;
packed->nr_entries = MMC_PACKED_NR_ZERO;
packed->idx_failure = MMC_PACKED_NR_IDX;
@@ -1443,8 +1441,6 @@
int err, check, status;
u8 *ext_csd;
- BUG_ON(!packed);
-
packed->retries--;
check = mmc_blk_err_check(card, areq);
err = get_card_status(card, &status, 0);
@@ -1673,6 +1669,18 @@
u8 max_packed_rw = 0;
u8 reqs = 0;
+ /*
+ * We don't need to check packed for any further
+ * operation of packed stuff as we set MMC_PACKED_NONE
+ * and return zero for reqs if geting null packed. Also
+ * we clean the flag of MMC_BLK_PACKED_CMD to avoid doing
+ * it again when removing blk req.
+ */
+ if (!mqrq->packed) {
+ md->flags &= (~MMC_BLK_PACKED_CMD);
+ goto no_packed;
+ }
+
if (!(md->flags & MMC_BLK_PACKED_CMD))
goto no_packed;
@@ -1782,8 +1790,6 @@
u8 hdr_blocks;
u8 i = 1;
- BUG_ON(!packed);
-
mqrq->cmd_type = MMC_PACKED_WRITE;
packed->blocks = 0;
packed->idx_failure = MMC_PACKED_NR_IDX;
@@ -1887,8 +1893,6 @@
int idx = packed->idx_failure, i = 0;
int ret = 0;
- BUG_ON(!packed);
-
while (!list_empty(&packed->list)) {
prq = list_entry_rq(packed->list.next);
if (idx == i) {
@@ -1917,8 +1921,6 @@
struct request *prq;
struct mmc_packed *packed = mq_rq->packed;
- BUG_ON(!packed);
-
while (!list_empty(&packed->list)) {
prq = list_entry_rq(packed->list.next);
list_del_init(&prq->queuelist);
@@ -1935,8 +1937,6 @@
struct request_queue *q = mq->queue;
struct mmc_packed *packed = mq_rq->packed;
- BUG_ON(!packed);
-
while (!list_empty(&packed->list)) {
prq = list_entry_rq(packed->list.prev);
if (prq->queuelist.prev != &packed->list) {
