Commit 02b45b47 authored by Srinivas Kandagatla's avatar Srinivas Kandagatla Committed by Greg Kroah-Hartman
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misc: fastrpc: fix remote page size calculation 



Remote page size should be calculated based on address and size, fix this!
Without this we will endup with one page less in cases where the buffer
is across 3 pages.

Fixes: c68cfb71 ("misc: fastrpc: Add support for context Invoke method")
Reported-by: default avatarKrishnaiah Tadakamalla <ktadakam@qti.qualcomm.com>
Signed-off-by: default avatarSrinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 25e8dfb8

drivers/misc/fastrpc.c

+9 −2
Original line number Diff line number Diff line
@@ -712,6 +712,7 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 
	struct fastrpc_phy_page *pages;

	int inbufs, i, oix, err = 0;

	u64 len, rlen, pkt_size;

	u64 pg_start, pg_end;

	uintptr_t args;

	int metalen;
@@ -751,8 +752,6 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 
		if (!len)

			continue;



		pages[i].size = roundup(len, PAGE_SIZE);



		if (ctx->maps[i]) {

			struct vm_area_struct *vma = NULL;
@@ -764,6 +763,11 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 
				pages[i].addr += ctx->args[i].ptr -

						 vma->vm_start;



			pg_start = (ctx->args[i].ptr & PAGE_MASK) >> PAGE_SHIFT;

			pg_end = ((ctx->args[i].ptr + len - 1) & PAGE_MASK) >>

				  PAGE_SHIFT;

			pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;



		} else {



			if (ctx->olaps[oix].offset == 0) {
@@ -782,6 +786,9 @@ static int fastrpc_get_args(u32 kernel, struct fastrpc_invoke_ctx *ctx) 
					(pkt_size - rlen);

			pages[i].addr = pages[i].addr &	PAGE_MASK;



			pg_start = (args & PAGE_MASK) >> PAGE_SHIFT;

			pg_end = ((args + len - 1) & PAGE_MASK) >> PAGE_SHIFT;

			pages[i].size = (pg_end - pg_start + 1) * PAGE_SIZE;

			args = args + mlen;

			rlen -= mlen;

		}