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180 lines
8.7 KiB
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180 lines
8.7 KiB
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Tue, 22 Sep 2020 04:49:44 -0700 (PDT)
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From: Chuanhong Guo <gch981213@gmail.com>
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To: linux-spi@vger.kernel.org
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Subject: [PATCH v2] spi: spi-mtk-nor: fix timeout calculation overflow
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Date: Tue, 22 Sep 2020 19:49:02 +0800
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Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
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Mark Brown <broonie@kernel.org>, linux-mediatek@lists.infradead.org,
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bayi.cheng@mediatek.com, Matthias Brugger <matthias.bgg@gmail.com>,
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Chuanhong Guo <gch981213@gmail.com>, linux-arm-kernel@lists.infradead.org
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CLK_TO_US macro is used to calculate potential transfer time for various
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timeout handling. However it overflows on transfer bigger than 512 bytes
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because it first did (len * 8 * 1000000).
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This controller typically operates at 45MHz. This patch did 2 things:
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1. calculate clock / 1000000 first
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2. add a 4M transfer size cap so that the final timeout in DMA reading
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doesn't overflow
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Fixes: 881d1ee9fe81f ("spi: add support for mediatek spi-nor controller")
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
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---
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Change since v1: fix transfer size cap to 4M
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drivers/spi/spi-mtk-nor.c | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
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index 6e6ca2b8e6c82..62f5ff2779884 100644
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--- a/drivers/spi/spi-mtk-nor.c
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+++ b/drivers/spi/spi-mtk-nor.c
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@@ -89,7 +89,7 @@
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// Buffered page program can do one 128-byte transfer
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#define MTK_NOR_PP_SIZE 128
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-#define CLK_TO_US(sp, clkcnt) ((clkcnt) * 1000000 / sp->spi_freq)
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+#define CLK_TO_US(sp, clkcnt) DIV_ROUND_UP(clkcnt, sp->spi_freq / 1000000)
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struct mtk_nor {
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struct spi_controller *ctlr;
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@@ -177,6 +177,10 @@ static int mtk_nor_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
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if ((op->addr.nbytes == 3) || (op->addr.nbytes == 4)) {
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if ((op->data.dir == SPI_MEM_DATA_IN) &&
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mtk_nor_match_read(op)) {
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+ // limit size to prevent timeout calculation overflow
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+ if (op->data.nbytes > 0x400000)
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+ op->data.nbytes = 0x400000;
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+
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if ((op->addr.val & MTK_NOR_DMA_ALIGN_MASK) ||
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(op->data.nbytes < MTK_NOR_DMA_ALIGN))
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op->data.nbytes = 1;
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