From ef79d9456177a33e999f3ef1e10e2ff02ad53173 Mon Sep 17 00:00:00 2001 From: Jonas Aaberg Date: Thu, 27 May 2010 13:59:22 +0200 Subject: [PATCH 19/45] DMAENGINE: ste_dma40: deny ops on non-alloc channels Added checks to deny operating on none-allocated channels. Signed-off-by: Jonas Aaberg Signed-off-by: Linus Walleij --- drivers/dma/ste_dma40.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 44 insertions(+), 0 deletions(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index c1a4077..aba86bb 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -1545,6 +1545,12 @@ struct dma_async_tx_descriptor *stedma40_memcpy_sg(struct dma_chan *chan, chan); unsigned long flags; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Unallocated channel.\n", __func__); + return ERR_PTR(-EINVAL); + } + spin_lock_irqsave(&d40c->lock, flags); d40d = d40_desc_get(d40c); @@ -1716,6 +1722,13 @@ static void d40_free_chan_resources(struct dma_chan *chan) int err; unsigned long flags; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Cannot free unallocated channel\n", __func__); + return; + } + + spin_lock_irqsave(&d40c->lock, flags); err = d40_free_dma(d40c); @@ -1738,6 +1751,12 @@ static struct dma_async_tx_descriptor *d40_prep_memcpy(struct dma_chan *chan, unsigned long flags; int err = 0; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Channel is not allocated.\n", __func__); + return ERR_PTR(-EINVAL); + } + spin_lock_irqsave(&d40c->lock, flags); d40d = d40_desc_get(d40c); @@ -1953,6 +1972,12 @@ static struct dma_async_tx_descriptor *d40_prep_slave_sg(struct dma_chan *chan, unsigned long flags; int err; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Cannot prepare unallocated channel\n", __func__); + return ERR_PTR(-EINVAL); + } + if (d40c->dma_cfg.pre_transfer) d40c->dma_cfg.pre_transfer(chan, d40c->dma_cfg.pre_transfer_data, @@ -1999,6 +2024,13 @@ static enum dma_status d40_tx_status(struct dma_chan *chan, dma_cookie_t last_complete; int ret; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Cannot read status of unallocated channel\n", + __func__); + return -EINVAL; + } + last_complete = d40c->completed; last_used = chan->cookie; @@ -2018,6 +2050,12 @@ static void d40_issue_pending(struct dma_chan *chan) struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); unsigned long flags; + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Channel is not allocated!\n", __func__); + return; + } + spin_lock_irqsave(&d40c->lock, flags); /* Busy means that pending jobs are already being processed */ @@ -2033,6 +2071,12 @@ static int d40_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long flags; struct d40_chan *d40c = container_of(chan, struct d40_chan, chan); + if (d40c->phy_chan == NULL) { + dev_err(&d40c->chan.dev->device, + "[%s] Channel is not allocated!\n", __func__); + return -EINVAL; + } + switch (cmd) { case DMA_TERMINATE_ALL: spin_lock_irqsave(&d40c->lock, flags); -- 1.6.3.3