diff options
| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2011-07-14 18:39:10 +0200 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-07-21 10:35:07 -0400 |
| commit | 162f43e31c5a376ec16336e5d0ac973373d54c89 (patch) | |
| tree | 366ce758f78683291ca7db913276611ffaca00fb /drivers/mmc/host/tmio_mmc_dma.c | |
| parent | 332bdb506f800d177f6657247347a253dd5b5be8 (diff) | |
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 <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/tmio_mmc_dma.c')
| -rw-r--r-- | drivers/mmc/host/tmio_mmc_dma.c | 5 |
1 files changed, 4 insertions, 1 deletions
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); |