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As reported by Aaro, the JZ4740 MMC driver throws a warning when the kernel
is built without preemption (CONFIG_PREEMPT_NONE=y).
[ 16.461094] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 567 host->next_data.cookie 568
[ 16.473120] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 568 host->next_data.cookie 569
[ 16.485144] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 569 host->next_data.cookie 570
[ 16.497170] jz4740-mmc 13450000.mmc: [jz4740_mmc_prepare_dma_data] invalid cookie: data->host_cookie 570 host->next_data.cookie 571
The problem seems to be related to how pre_req/post_req is implemented.
Currently, it seems the driver expects jz4740_mmc_prepare_dma_data() to be
called with monotonically increasing host_cookie values, which is wrong.
Moreover, the implementation is overly complicated, keeping track of
unneeded "next cookie" state.
So, instead of attempting to fix the current pre_req/post_req
implementation, this commit refactors the driver, dropping the state,
following other drivers such as dw_mmc and sdhci.
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: Mathieu Malaterre <malat@debian.org>
Reported-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
96e03fffa3