From 162f43e31c5a376ec16336e5d0ac973373d54c89 Mon Sep 17 00:00:00 2001 From: Guennadi Liakhovetski Date: Thu, 14 Jul 2011 18:39:10 +0200 Subject: mmc: tmio: fix a deadlock Currently the tmio-mmc driver contains a recursive runtime PM method invocation, which leads to a deadlock on a mutex. Avoid it by taking care not to request DMA too early. Signed-off-by: Guennadi Liakhovetski Signed-off-by: Chris Ball --- drivers/mmc/host/tmio_mmc_dma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'drivers/mmc/host/tmio_mmc_dma.c') diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c index 7e86662717d6..2aa616dec32d 100644 --- a/drivers/mmc/host/tmio_mmc_dma.c +++ b/drivers/mmc/host/tmio_mmc_dma.c @@ -22,8 +22,11 @@ #define TMIO_MMC_MIN_DMA_LEN 8 -static void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) +void tmio_mmc_enable_dma(struct tmio_mmc_host *host, bool enable) { + if (!host->chan_tx || !host->chan_rx) + return; + #if defined(CONFIG_SUPERH) || defined(CONFIG_ARCH_SHMOBILE) /* Switch DMA mode on or off - SuperH specific? */ sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? 2 : 0); -- cgit v1.2.3