diff options
Diffstat (limited to 'target/linux/apm821xx/patches-4.4/010-dmaengine-Add-transfer-termination-synchronization-s.patch')
| -rw-r--r-- | target/linux/apm821xx/patches-4.4/010-dmaengine-Add-transfer-termination-synchronization-s.patch | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/target/linux/apm821xx/patches-4.4/010-dmaengine-Add-transfer-termination-synchronization-s.patch b/target/linux/apm821xx/patches-4.4/010-dmaengine-Add-transfer-termination-synchronization-s.patch new file mode 100644 index 0000000..924f797 --- /dev/null +++ b/target/linux/apm821xx/patches-4.4/010-dmaengine-Add-transfer-termination-synchronization-s.patch @@ -0,0 +1,143 @@ +From 7bd903c5ca47fde5ad52370a47776491813c772e Mon Sep 17 00:00:00 2001 +From: Peter Ujfalusi <peter.ujfalusi@ti.com> +Date: Mon, 14 Dec 2015 22:47:39 +0200 +Subject: [PATCH 1/3] dmaengine: core: Move and merge the code paths using + private_candidate + +Channel matching with private_candidate() is used in two paths, the error +checking is slightly different in them and they are duplicating code also. +Move the code under find_candidate() to provide consistent execution and +going to allow us to reuse this mode of channel lookup later. + +Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> +Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> +Reviewed-by: Arnd Bergmann <arnd@arndb.de> +Signed-off-by: Vinod Koul <vinod.koul@intel.com> +--- + drivers/dma/dmaengine.c | 81 +++++++++++++++++++++++++------------------------ + 1 file changed, 42 insertions(+), 39 deletions(-) + +diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c +index f2cbff9..81a36fc 100644 +--- a/drivers/dma/dmaengine.c ++++ b/drivers/dma/dmaengine.c +@@ -542,6 +542,42 @@ static struct dma_chan *private_candidate(const dma_cap_mask_t *mask, + return NULL; + } + ++static struct dma_chan *find_candidate(struct dma_device *device, ++ const dma_cap_mask_t *mask, ++ dma_filter_fn fn, void *fn_param) ++{ ++ struct dma_chan *chan = private_candidate(mask, device, fn, fn_param); ++ int err; ++ ++ if (chan) { ++ /* Found a suitable channel, try to grab, prep, and return it. ++ * We first set DMA_PRIVATE to disable balance_ref_count as this ++ * channel will not be published in the general-purpose ++ * allocator ++ */ ++ dma_cap_set(DMA_PRIVATE, device->cap_mask); ++ device->privatecnt++; ++ err = dma_chan_get(chan); ++ ++ if (err) { ++ if (err == -ENODEV) { ++ pr_debug("%s: %s module removed\n", __func__, ++ dma_chan_name(chan)); ++ list_del_rcu(&device->global_node); ++ } else ++ pr_debug("%s: failed to get %s: (%d)\n", ++ __func__, dma_chan_name(chan), err); ++ ++ if (--device->privatecnt == 0) ++ dma_cap_clear(DMA_PRIVATE, device->cap_mask); ++ ++ chan = ERR_PTR(err); ++ } ++ } ++ ++ return chan ? chan : ERR_PTR(-EPROBE_DEFER); ++} ++ + /** + * dma_get_slave_channel - try to get specific channel exclusively + * @chan: target channel +@@ -580,7 +616,6 @@ struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) + { + dma_cap_mask_t mask; + struct dma_chan *chan; +- int err; + + dma_cap_zero(mask); + dma_cap_set(DMA_SLAVE, mask); +@@ -588,23 +623,11 @@ struct dma_chan *dma_get_any_slave_channel(struct dma_device *device) + /* lock against __dma_request_channel */ + mutex_lock(&dma_list_mutex); + +- chan = private_candidate(&mask, device, NULL, NULL); +- if (chan) { +- dma_cap_set(DMA_PRIVATE, device->cap_mask); +- device->privatecnt++; +- err = dma_chan_get(chan); +- if (err) { +- pr_debug("%s: failed to get %s: (%d)\n", +- __func__, dma_chan_name(chan), err); +- chan = NULL; +- if (--device->privatecnt == 0) +- dma_cap_clear(DMA_PRIVATE, device->cap_mask); +- } +- } ++ chan = find_candidate(device, &mask, NULL, NULL); + + mutex_unlock(&dma_list_mutex); + +- return chan; ++ return IS_ERR(chan) ? NULL : chan; + } + EXPORT_SYMBOL_GPL(dma_get_any_slave_channel); + +@@ -621,35 +644,15 @@ struct dma_chan *__dma_request_channel(const dma_cap_mask_t *mask, + { + struct dma_device *device, *_d; + struct dma_chan *chan = NULL; +- int err; + + /* Find a channel */ + mutex_lock(&dma_list_mutex); + list_for_each_entry_safe(device, _d, &dma_device_list, global_node) { +- chan = private_candidate(mask, device, fn, fn_param); +- if (chan) { +- /* Found a suitable channel, try to grab, prep, and +- * return it. We first set DMA_PRIVATE to disable +- * balance_ref_count as this channel will not be +- * published in the general-purpose allocator +- */ +- dma_cap_set(DMA_PRIVATE, device->cap_mask); +- device->privatecnt++; +- err = dma_chan_get(chan); ++ chan = find_candidate(device, mask, fn, fn_param); ++ if (!IS_ERR(chan)) ++ break; + +- if (err == -ENODEV) { +- pr_debug("%s: %s module removed\n", +- __func__, dma_chan_name(chan)); +- list_del_rcu(&device->global_node); +- } else if (err) +- pr_debug("%s: failed to get %s: (%d)\n", +- __func__, dma_chan_name(chan), err); +- else +- break; +- if (--device->privatecnt == 0) +- dma_cap_clear(DMA_PRIVATE, device->cap_mask); +- chan = NULL; +- } ++ chan = NULL; + } + mutex_unlock(&dma_list_mutex); + +-- +2.8.1 + |