kernel: split patches folder up into backport, pending and hack folders

* properly format/comment all patches
* merge debloat patches
* merge Kconfig patches
* merge swconfig patches
* merge hotplug patches
* drop 200-fix_localversion.patch - upstream
* drop 222-arm_zimage_none.patch - unused
* drop 252-mv_cesa_depends.patch - no longer required
* drop 410-mtd-move-forward-declaration-of-struct-mtd_info.patch - unused
* drop 661-fq_codel_keep_dropped_stats.patch - outdated
* drop 702-phy_add_aneg_done_function.patch - upstream
* drop 840-rtc7301.patch - unused
* drop 841-rtc_pt7c4338.patch - upstream
* drop 921-use_preinit_as_init.patch - unused
* drop spio-gpio-old and gpio-mmc - unused

Signed-off-by: John Crispin <john@phrozen.org>

1 files changed, 130 insertions, 0 deletions

diff --git a/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch b/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
new file mode 100644
index 0000000000..2be65b4544
--- /dev/null
+++ b/target/linux/generic/pending-3.18/077-07-bgmac-simplify-rx-DMA-error-handling.patch
@@ -0,0 +1,130 @@
+From: Felix Fietkau <nbd@nbd.name>
+Date: Sun, 12 Apr 2015 22:23:07 +0200
+Subject: [PATCH] bgmac: simplify/optimize rx DMA error handling
+
+Allocate a new buffer before processing the completed one. If allocation
+fails, reuse the old buffer.
+
+Signed-off-by: Felix Fietkau <nbd@nbd.name>
+---
+
+--- a/drivers/net/ethernet/broadcom/bgmac.c
++++ b/drivers/net/ethernet/broadcom/bgmac.c
+@@ -386,6 +386,19 @@ static void bgmac_dma_rx_setup_desc(stru
+ 	dma_desc->ctl1 = cpu_to_le32(ctl1);
+ }
+ 
++static void bgmac_dma_rx_poison_buf(struct device *dma_dev,
++				    struct bgmac_slot_info *slot)
++{
++	struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
++
++	dma_sync_single_for_cpu(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
++				DMA_FROM_DEVICE);
++	rx->len = cpu_to_le16(0xdead);
++	rx->flags = cpu_to_le16(0xbeef);
++	dma_sync_single_for_device(dma_dev, slot->dma_addr, BGMAC_RX_BUF_SIZE,
++				   DMA_FROM_DEVICE);
++}
++
+ static int bgmac_dma_rx_read(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
+ 			     int weight)
+ {
+@@ -406,53 +419,35 @@ static int bgmac_dma_rx_read(struct bgma
+ 		struct bgmac_rx_header *rx = slot->buf + BGMAC_RX_BUF_OFFSET;
+ 		struct sk_buff *skb;
+ 		void *buf = slot->buf;
++		dma_addr_t dma_addr = slot->dma_addr;
+ 		u16 len, flags;
+ 
+-		/* Unmap buffer to make it accessible to the CPU */
+-		dma_sync_single_for_cpu(dma_dev, slot->dma_addr,
+-					BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+-
+-		/* Get info from the header */
+-		len = le16_to_cpu(rx->len);
+-		flags = le16_to_cpu(rx->flags);
+-
+ 		do {
+-			dma_addr_t old_dma_addr = slot->dma_addr;
+-			int err;
++			/* Prepare new skb as replacement */
++			if (bgmac_dma_rx_skb_for_slot(bgmac, slot)) {
++				bgmac_dma_rx_poison_buf(dma_dev, slot);
++				break;
++			}
++
++			/* Unmap buffer to make it accessible to the CPU */
++			dma_unmap_single(dma_dev, dma_addr,
++					 BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
++
++			/* Get info from the header */
++			len = le16_to_cpu(rx->len);
++			flags = le16_to_cpu(rx->flags);
+ 
+ 			/* Check for poison and drop or pass the packet */
+ 			if (len == 0xdead && flags == 0xbeef) {
+ 				bgmac_err(bgmac, "Found poisoned packet at slot %d, DMA issue!\n",
+ 					  ring->start);
+-				dma_sync_single_for_device(dma_dev,
+-							   slot->dma_addr,
+-							   BGMAC_RX_BUF_SIZE,
+-							   DMA_FROM_DEVICE);
++				put_page(virt_to_head_page(buf));
+ 				break;
+ 			}
+ 
+ 			/* Omit CRC. */
+ 			len -= ETH_FCS_LEN;
+ 
+-			/* Prepare new skb as replacement */
+-			err = bgmac_dma_rx_skb_for_slot(bgmac, slot);
+-			if (err) {
+-				/* Poison the old skb */
+-				rx->len = cpu_to_le16(0xdead);
+-				rx->flags = cpu_to_le16(0xbeef);
+-
+-				dma_sync_single_for_device(dma_dev,
+-							   slot->dma_addr,
+-							   BGMAC_RX_BUF_SIZE,
+-							   DMA_FROM_DEVICE);
+-				break;
+-			}
+-			bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
+-
+-			/* Unmap old skb, we'll pass it to the netfif */
+-			dma_unmap_single(dma_dev, old_dma_addr,
+-					 BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
+-
+ 			skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
+ 			skb_put(skb, BGMAC_RX_FRAME_OFFSET +
+ 				BGMAC_RX_BUF_OFFSET + len);
+@@ -465,6 +460,8 @@ static int bgmac_dma_rx_read(struct bgma
+ 			handled++;
+ 		} while (0);
+ 
++		bgmac_dma_rx_setup_desc(bgmac, ring, ring->start);
++
+ 		if (++ring->start >= BGMAC_RX_RING_SLOTS)
+ 			ring->start = 0;
+ 
+@@ -532,14 +529,14 @@ static void bgmac_dma_rx_ring_free(struc
+ 
+ 	for (i = 0; i < ring->num_slots; i++) {
+ 		slot = &ring->slots[i];
+-		if (!slot->buf)
++		if (!slot->dma_addr)
+ 			continue;
+ 
+-		if (slot->dma_addr)
+-			dma_unmap_single(dma_dev, slot->dma_addr,
+-					 BGMAC_RX_BUF_SIZE,
+-					 DMA_FROM_DEVICE);
++		dma_unmap_single(dma_dev, slot->dma_addr,
++				 BGMAC_RX_BUF_SIZE,
++				 DMA_FROM_DEVICE);
+ 		put_page(virt_to_head_page(slot->buf));
++		slot->dma_addr = 0;
+ 	}
+ }
+