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serial: 8250: Flush DMA Rx on RLSI
commit1980860e0c
upstream. Returning true from handle_rx_dma() without flushing DMA first creates a data ordering hazard. If DMA Rx has handled any character at the point when RLSI occurs, the non-DMA path handles any pending characters jumping them ahead of those characters that are pending under DMA. Fixes:75df022b5f
("serial: 8250_dma: Fix RX handling") Cc: <stable@vger.kernel.org> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://lore.kernel.org/r/20221108121952.5497-5-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 1 additions and 2 deletions
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@ -1870,10 +1870,9 @@ static bool handle_rx_dma(struct uart_8250_port *up, unsigned int iir)
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if (!up->dma->rx_running)
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break;
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/* fall-through */
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case UART_IIR_RLSI:
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case UART_IIR_RX_TIMEOUT:
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serial8250_rx_dma_flush(up);
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/* fall-through */
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case UART_IIR_RLSI:
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return true;
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}
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return up->dma->rx_dma(up);
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