forked from luck/tmp_suning_uos_patched
736cd79f48
So far DMA mode were activated when only number of bytes to send was equal or greater than min_dma_size. Due to requirement that DMA transaction buffer should be aligned to cache line size, the excessive bytes were written to FIFO before starting DMA transaction. The problem occurred when FIFO size were smaller than cache alignment, because writing all excessive bytes to FIFO would fail. It happened in DMA mode when PIO interrupts disabled, which caused driver hung. The solution is to test if buffer is alligned to cache line size before activating DMA mode, and if it's not, running PIO mode to align buffer and then starting DMA transaction. In PIO mode, when interrupts are enabled, lack of space in FIFO isn't the problem, so buffer aligning will always finish with success. Cc: <stable@vger.kernel.org> # v3.18+ Reported-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Robert Baldyga <r.baldyga@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| hvc | ||
| ipwireless | ||
| serial | ||
| vt | ||
| amiserial.c | ||
| bfin_jtag_comm.c | ||
| cyclades.c | ||
| ehv_bytechan.c | ||
| goldfish.c | ||
| isicom.c | ||
| Kconfig | ||
| Makefile | ||
| metag_da.c | ||
| mips_ejtag_fdc.c | ||
| moxa.c | ||
| moxa.h | ||
| mxser.c | ||
| mxser.h | ||
| n_gsm.c | ||
| n_hdlc.c | ||
| n_r3964.c | ||
| n_tracerouter.c | ||
| n_tracesink.c | ||
| n_tracesink.h | ||
| n_tty.c | ||
| nozomi.c | ||
| pty.c | ||
| rocket_int.h | ||
| rocket.c | ||
| rocket.h | ||
| synclink_gt.c | ||
| synclink.c | ||
| synclinkmp.c | ||
| sysrq.c | ||
| tty_audit.c | ||
| tty_buffer.c | ||
| tty_io.c | ||
| tty_ioctl.c | ||
| tty_ldisc.c | ||
| tty_ldsem.c | ||
| tty_mutex.c | ||
| tty_port.c | ||