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Commit 601ed60c authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: core: Don't handle buffers on stack while fetching CXD registers 



Due to previous patches, all callers of mmc_send_cxd_data() now
allocates their buffers from the heap. This enables us to simplify
mmc_send_cxd_data() by removing the support of handling buffers, which
are allocated from the stack.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 2fc91e8b

drivers/mmc/core/mmc_ops.c

+1 −20
Original line number Diff line number Diff line
@@ -264,20 +264,6 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host, 
	struct mmc_command cmd = {0};

	struct mmc_data data = {0};

	struct scatterlist sg;

	void *data_buf;

	int is_on_stack;



	is_on_stack = object_is_on_stack(buf);

	if (is_on_stack) {

		/*

		 * dma onto stack is unsafe/nonportable, but callers to this

		 * routine normally provide temporary on-stack buffers ...

		 */

		data_buf = kmalloc(len, GFP_KERNEL);

		if (!data_buf)

			return -ENOMEM;

	} else

		data_buf = buf;



	mrq.cmd = &cmd;

	mrq.data = &data;
@@ -298,7 +284,7 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host, 
	data.sg = &sg;

	data.sg_len = 1;



	sg_init_one(&sg, data_buf, len);

	sg_init_one(&sg, buf, len);



	if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {

		/*
@@ -312,11 +298,6 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host, 


	mmc_wait_for_req(host, &mrq);



	if (is_on_stack) {

		memcpy(buf, data_buf, len);

		kfree(data_buf);

	}



	if (cmd.error)

		return cmd.error;

	if (data.error)