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xtensa/esp32: Avoid incrementing a NULL pointer for RX buffer

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This commit is contained in:
Gustavo Henrique Nihei
2021-03-25 17:32:06 -03:00
committed by Xiang Xiao
parent a27d5b1063
commit 4d877abf3f
1 changed files with 4 additions and 2 deletions
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arch/xtensa/src/esp32/esp32_spi.c
+4 -2
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@@ -916,6 +916,8 @@ static void esp32_spi_dma_exchange(FAR struct esp32_spi_priv_s *priv,
esp32_spi_set_reg(priv, SPI_MOSI_DLEN_OFFSET, bytes * 8 - 1); esp32_spi_set_reg(priv, SPI_MOSI_DLEN_OFFSET, bytes * 8 - 1);
esp32_spi_set_regbits(priv, SPI_USER_OFFSET, SPI_USR_MOSI_M); esp32_spi_set_regbits(priv, SPI_USER_OFFSET, SPI_USR_MOSI_M);
tp += n;
if (rp) if (rp)
{ {
esp32_dma_init(s_dma_rxdesc[priv->config->dma_chan - 1], esp32_dma_init(s_dma_rxdesc[priv->config->dma_chan - 1],
@@ -927,6 +929,8 @@ static void esp32_spi_dma_exchange(FAR struct esp32_spi_priv_s *priv,
regval | SPI_INLINK_START_M); regval | SPI_INLINK_START_M);
esp32_spi_set_reg(priv, SPI_MISO_DLEN_OFFSET, bytes * 8 - 1); esp32_spi_set_reg(priv, SPI_MISO_DLEN_OFFSET, bytes * 8 - 1);
esp32_spi_set_regbits(priv, SPI_USER_OFFSET, SPI_USR_MISO_M); esp32_spi_set_regbits(priv, SPI_USER_OFFSET, SPI_USR_MISO_M);
rp += n;
} }
else else
{ {
@@ -938,8 +942,6 @@ static void esp32_spi_dma_exchange(FAR struct esp32_spi_priv_s *priv,
esp32_spi_sem_waitdone(priv); esp32_spi_sem_waitdone(priv);
bytes -= n; bytes -= n;
tp += n;
rp += n;
} }
esp32_spi_reset_regbits(priv, SPI_SLAVE_OFFSET, SPI_INT_EN_M); esp32_spi_reset_regbits(priv, SPI_SLAVE_OFFSET, SPI_INT_EN_M);