8072264b96
Refresh patches for all targets that support kernel 4.4. Compile-tested on all targets that use kernel 4.4 and aren't marked broken. Runtime-tested on ar71xx, octeon and x86/64. Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>
138 lines
4.1 KiB
Diff
138 lines
4.1 KiB
Diff
From 7bd903c5ca47fde5ad52370a47776491813c772e Mon Sep 17 00:00:00 2001
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From: Peter Ujfalusi <peter.ujfalusi@ti.com>
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Date: Mon, 14 Dec 2015 22:47:39 +0200
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Subject: [PATCH 1/3] dmaengine: core: Move and merge the code paths using
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private_candidate
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Channel matching with private_candidate() is used in two paths, the error
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checking is slightly different in them and they are duplicating code also.
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Move the code under find_candidate() to provide consistent execution and
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going to allow us to reuse this mode of channel lookup later.
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Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
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Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
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Reviewed-by: Arnd Bergmann <arnd@arndb.de>
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Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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---
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drivers/dma/dmaengine.c | 81 +++++++++++++++++++++++++------------------------
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1 file changed, 42 insertions(+), 39 deletions(-)
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--- a/drivers/dma/dmaengine.c
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+++ b/drivers/dma/dmaengine.c
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@@ -542,6 +542,42 @@ static struct dma_chan *private_candidat
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return NULL;
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}
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+static struct dma_chan *find_candidate(struct dma_device *device,
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+ const dma_cap_mask_t *mask,
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+ dma_filter_fn fn, void *fn_param)
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+{
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+ struct dma_chan *chan = private_candidate(mask, device, fn, fn_param);
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+ int err;
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+
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+ if (chan) {
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+ /* Found a suitable channel, try to grab, prep, and return it.
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+ * We first set DMA_PRIVATE to disable balance_ref_count as this
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+ * channel will not be published in the general-purpose
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+ * allocator
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+ */
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+ dma_cap_set(DMA_PRIVATE, device->cap_mask);
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+ device->privatecnt++;
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+ err = dma_chan_get(chan);
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+
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+ if (err) {
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+ if (err == -ENODEV) {
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+ pr_debug("%s: %s module removed\n", __func__,
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+ dma_chan_name(chan));
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+ list_del_rcu(&device->global_node);
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+ } else
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+ pr_debug("%s: failed to get %s: (%d)\n",
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+ __func__, dma_chan_name(chan), err);
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+
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+ if (--device->privatecnt == 0)
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+ dma_cap_clear(DMA_PRIVATE, device->cap_mask);
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+
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+ chan = ERR_PTR(err);
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+ }
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+ }
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+
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+ return chan ? chan : ERR_PTR(-EPROBE_DEFER);
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+}
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+
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/**
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* dma_get_slave_channel - try to get specific channel exclusively
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* @chan: target channel
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@@ -580,7 +616,6 @@ struct dma_chan *dma_get_any_slave_chann
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{
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dma_cap_mask_t mask;
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struct dma_chan *chan;
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- int err;
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dma_cap_zero(mask);
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dma_cap_set(DMA_SLAVE, mask);
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@@ -588,23 +623,11 @@ struct dma_chan *dma_get_any_slave_chann
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/* lock against __dma_request_channel */
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mutex_lock(&dma_list_mutex);
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- chan = private_candidate(&mask, device, NULL, NULL);
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- if (chan) {
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- dma_cap_set(DMA_PRIVATE, device->cap_mask);
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- device->privatecnt++;
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- err = dma_chan_get(chan);
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- if (err) {
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- pr_debug("%s: failed to get %s: (%d)\n",
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- __func__, dma_chan_name(chan), err);
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- chan = NULL;
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- if (--device->privatecnt == 0)
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- dma_cap_clear(DMA_PRIVATE, device->cap_mask);
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- }
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- }
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+ chan = find_candidate(device, &mask, NULL, NULL);
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mutex_unlock(&dma_list_mutex);
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- return chan;
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+ return IS_ERR(chan) ? NULL : chan;
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}
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EXPORT_SYMBOL_GPL(dma_get_any_slave_channel);
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@@ -621,35 +644,15 @@ struct dma_chan *__dma_request_channel(c
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{
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struct dma_device *device, *_d;
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struct dma_chan *chan = NULL;
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- int err;
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/* Find a channel */
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mutex_lock(&dma_list_mutex);
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list_for_each_entry_safe(device, _d, &dma_device_list, global_node) {
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- chan = private_candidate(mask, device, fn, fn_param);
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- if (chan) {
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- /* Found a suitable channel, try to grab, prep, and
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- * return it. We first set DMA_PRIVATE to disable
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- * balance_ref_count as this channel will not be
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- * published in the general-purpose allocator
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- */
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- dma_cap_set(DMA_PRIVATE, device->cap_mask);
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- device->privatecnt++;
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- err = dma_chan_get(chan);
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+ chan = find_candidate(device, mask, fn, fn_param);
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+ if (!IS_ERR(chan))
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+ break;
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- if (err == -ENODEV) {
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- pr_debug("%s: %s module removed\n",
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- __func__, dma_chan_name(chan));
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- list_del_rcu(&device->global_node);
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- } else if (err)
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- pr_debug("%s: failed to get %s: (%d)\n",
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- __func__, dma_chan_name(chan), err);
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- else
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- break;
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- if (--device->privatecnt == 0)
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- dma_cap_clear(DMA_PRIVATE, device->cap_mask);
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- chan = NULL;
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- }
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+ chan = NULL;
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}
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mutex_unlock(&dma_list_mutex);
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