serial: sh-sci: Don't call sci_rx_interrupt() on error when using DMA

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The error handler calls sci_rx_interrupt() to drain the receive FIFO if
an error condition happens.

However, if DMA is enabled on SCIFA or SCIFB, this will call
disable_irq_nosync() twice. Due to this imbalance, the receive interrupt
will never be re-enabled, and reception stops forever.

To fix this, restrict draining the FIFO to PIO mode, and just call
sci_receive_chars() directly.

Inspired by a patch from Yoshihiro Shimoda
<yoshihiro.shimoda.uh@renesas.com>.

Reported-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Geert Uytterhoeven 2015-08-21 20:02:55 +02:00 • committed by Greg Kroah-Hartman

parent 7b39d90184

commit e6403c112f

1 changed files with 3 additions and 1 deletions

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drivers/tty/serial/sh-sci.c

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