From d814dee0e1a5d9b2f858b91551a0dd0608f777a1 Mon Sep 17 00:00:00 2001 From: Russell King - ARM Linux Date: Fri, 10 Jun 2011 00:51:54 +0000 Subject: NET: am79c961: ensure asm() statements are marked volatile Without this the compiler can (and does) optimize register reads away from within loops, and other such optimizations. Signed-off-by: Russell King Signed-off-by: David S. Miller --- drivers/net/arm/am79c961a.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/am79c961a.c b/drivers/net/arm/am79c961a.c index 0c9217f48b72..084b67fbe7aa 100644 --- a/drivers/net/arm/am79c961a.c +++ b/drivers/net/arm/am79c961a.c @@ -50,7 +50,7 @@ static const char version[] = #ifdef __arm__ static void write_rreg(u_long base, u_int reg, u_int val) { - __asm__( + asm volatile( "str%?h %1, [%2] @ NET_RAP\n\t" "str%?h %0, [%2, #-4] @ NET_RDP" : @@ -60,7 +60,7 @@ static void write_rreg(u_long base, u_int reg, u_int val) static inline unsigned short read_rreg(u_long base_addr, u_int reg) { unsigned short v; - __asm__( + asm volatile( "str%?h %1, [%2] @ NET_RAP\n\t" "ldr%?h %0, [%2, #-4] @ NET_RDP" : "=r" (v) @@ -70,7 +70,7 @@ static inline unsigned short read_rreg(u_long base_addr, u_int reg) static inline void write_ireg(u_long base, u_int reg, u_int val) { - __asm__( + asm volatile( "str%?h %1, [%2] @ NET_RAP\n\t" "str%?h %0, [%2, #8] @ NET_IDP" : @@ -80,7 +80,7 @@ static inline void write_ireg(u_long base, u_int reg, u_int val) static inline unsigned short read_ireg(u_long base_addr, u_int reg) { u_short v; - __asm__( + asm volatile( "str%?h %1, [%2] @ NAT_RAP\n\t" "ldr%?h %0, [%2, #8] @ NET_IDP\n\t" : "=r" (v) @@ -131,7 +131,7 @@ am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned length = (length + 1) & ~1; if ((int)buf & 2) { unsigned int tmp; - __asm__ __volatile__( + asm volatile( "ldr%?h %2, [%0], #4\n\t" "str%?b %2, [%1], #1\n\t" "mov%? %2, %2, lsr #8\n\t" @@ -141,7 +141,7 @@ am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned } while (length > 8) { unsigned int tmp, tmp2, tmp3; - __asm__ __volatile__( + asm volatile( "ldr%?h %2, [%0], #4\n\t" "ldr%?h %3, [%0], #4\n\t" "orr%? %2, %2, %3, lsl #16\n\t" @@ -155,7 +155,7 @@ am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned } while (length > 0) { unsigned int tmp; - __asm__ __volatile__( + asm volatile( "ldr%?h %2, [%0], #4\n\t" "str%?b %2, [%1], #1\n\t" "mov%? %2, %2, lsr #8\n\t" -- cgit v1.2.3 From bfc6501324427a97814de1587f89d73bf8677057 Mon Sep 17 00:00:00 2001 From: Russell King - ARM Linux Date: Fri, 10 Jun 2011 00:52:14 +0000 Subject: NET: am79c961: ensure multicast filter is correctly set at open We were clearing out the multicast filter whenever the interface was upped, and not setting the mode bits correctly. This can cause problems if there are any multicast addresses already set at this point, or if ALLMULTI was set. Signed-off-by: Russell King Signed-off-by: David S. Miller --- drivers/net/arm/am79c961a.c | 77 +++++++++++++++++++++++---------------------- 1 file changed, 40 insertions(+), 37 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/am79c961a.c b/drivers/net/arm/am79c961a.c index 084b67fbe7aa..79d88a0b00a3 100644 --- a/drivers/net/arm/am79c961a.c +++ b/drivers/net/arm/am79c961a.c @@ -196,6 +196,42 @@ am79c961_ramtest(struct net_device *dev, unsigned int val) return errorcount; } +static void am79c961_mc_hash(char *addr, u16 *hash) +{ + if (addr[0] & 0x01) { + int idx, bit; + u32 crc; + + crc = ether_crc_le(ETH_ALEN, addr); + + idx = crc >> 30; + bit = (crc >> 26) & 15; + + hash[idx] |= 1 << bit; + } +} + +static unsigned int am79c961_get_rx_mode(struct net_device *dev, u16 *hash) +{ + unsigned int mode = MODE_PORT_10BT; + + if (dev->flags & IFF_PROMISC) { + mode |= MODE_PROMISC; + memset(hash, 0xff, 4 * sizeof(*hash)); + } else if (dev->flags & IFF_ALLMULTI) { + memset(hash, 0xff, 4 * sizeof(*hash)); + } else { + struct netdev_hw_addr *ha; + + memset(hash, 0, 4 * sizeof(*hash)); + + netdev_for_each_mc_addr(ha, dev) + am79c961_mc_hash(ha->addr, hash); + } + + return mode; +} + static void am79c961_init_for_open(struct net_device *dev) { @@ -203,6 +239,7 @@ am79c961_init_for_open(struct net_device *dev) unsigned long flags; unsigned char *p; u_int hdr_addr, first_free_addr; + u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash); int i; /* @@ -218,16 +255,12 @@ am79c961_init_for_open(struct net_device *dev) write_ireg (dev->base_addr, 2, 0x0000); /* MODE register selects media */ for (i = LADRL; i <= LADRH; i++) - write_rreg (dev->base_addr, i, 0); + write_rreg (dev->base_addr, i, multi_hash[i - LADRL]); for (i = PADRL, p = dev->dev_addr; i <= PADRH; i++, p += 2) write_rreg (dev->base_addr, i, p[0] | (p[1] << 8)); - i = MODE_PORT_10BT; - if (dev->flags & IFF_PROMISC) - i |= MODE_PROMISC; - - write_rreg (dev->base_addr, MODE, i); + write_rreg (dev->base_addr, MODE, mode); write_rreg (dev->base_addr, POLLINT, 0); write_rreg (dev->base_addr, SIZERXR, -RX_BUFFERS); write_rreg (dev->base_addr, SIZETXR, -TX_BUFFERS); @@ -340,21 +373,6 @@ am79c961_close(struct net_device *dev) return 0; } -static void am79c961_mc_hash(char *addr, unsigned short *hash) -{ - if (addr[0] & 0x01) { - int idx, bit; - u32 crc; - - crc = ether_crc_le(ETH_ALEN, addr); - - idx = crc >> 30; - bit = (crc >> 26) & 15; - - hash[idx] |= 1 << bit; - } -} - /* * Set or clear promiscuous/multicast mode filter for this adapter. */ @@ -362,24 +380,9 @@ static void am79c961_setmulticastlist (struct net_device *dev) { struct dev_priv *priv = netdev_priv(dev); unsigned long flags; - unsigned short multi_hash[4], mode; + u16 multi_hash[4], mode = am79c961_get_rx_mode(dev, multi_hash); int i, stopped; - mode = MODE_PORT_10BT; - - if (dev->flags & IFF_PROMISC) { - mode |= MODE_PROMISC; - } else if (dev->flags & IFF_ALLMULTI) { - memset(multi_hash, 0xff, sizeof(multi_hash)); - } else { - struct netdev_hw_addr *ha; - - memset(multi_hash, 0x00, sizeof(multi_hash)); - - netdev_for_each_mc_addr(ha, dev) - am79c961_mc_hash(ha->addr, multi_hash); - } - spin_lock_irqsave(&priv->chip_lock, flags); stopped = read_rreg(dev->base_addr, CSR0) & CSR0_STOP; -- cgit v1.2.3 From f777737885a69d37132c956f1e8deab676693157 Mon Sep 17 00:00:00 2001 From: Russell King - ARM Linux Date: Fri, 10 Jun 2011 00:52:35 +0000 Subject: NET: am79c961: fix assembler warnings Fix: /tmp/ccvoZ6h8.s: Assembler messages: /tmp/ccvoZ6h8.s:284: Warning: register range not in ascending order /tmp/ccvoZ6h8.s:881: Warning: register range not in ascending order /tmp/ccvoZ6h8.s:1087: Warning: register range not in ascending order by ensuring that we have temporary variables placed into specific registers. Reorder the code a bit to allow the resulting assembly to be slightly more optimal. Signed-off-by: Russell King Signed-off-by: David S. Miller --- drivers/net/arm/am79c961a.c | 35 ++++++++++++++++++----------------- 1 file changed, 18 insertions(+), 17 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/am79c961a.c b/drivers/net/arm/am79c961a.c index 79d88a0b00a3..7b3e23f38913 100644 --- a/drivers/net/arm/am79c961a.c +++ b/drivers/net/arm/am79c961a.c @@ -91,40 +91,41 @@ static inline unsigned short read_ireg(u_long base_addr, u_int reg) #define am_writeword(dev,off,val) __raw_writew(val, ISAMEM_BASE + ((off) << 1)) #define am_readword(dev,off) __raw_readw(ISAMEM_BASE + ((off) << 1)) -static inline void +static void am_writebuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length) { offset = ISAMEM_BASE + (offset << 1); length = (length + 1) & ~1; if ((int)buf & 2) { - __asm__ __volatile__("str%?h %2, [%0], #4" + asm volatile("str%?h %2, [%0], #4" : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8))); buf += 2; length -= 2; } while (length > 8) { - unsigned int tmp, tmp2; - __asm__ __volatile__( - "ldm%?ia %1!, {%2, %3}\n\t" + register unsigned int tmp asm("r2"), tmp2 asm("r3"); + asm volatile( + "ldm%?ia %0!, {%1, %2}" + : "+r" (buf), "=&r" (tmp), "=&r" (tmp2)); + length -= 8; + asm volatile( + "str%?h %1, [%0], #4\n\t" + "mov%? %1, %1, lsr #16\n\t" + "str%?h %1, [%0], #4\n\t" "str%?h %2, [%0], #4\n\t" "mov%? %2, %2, lsr #16\n\t" - "str%?h %2, [%0], #4\n\t" - "str%?h %3, [%0], #4\n\t" - "mov%? %3, %3, lsr #16\n\t" - "str%?h %3, [%0], #4" - : "=&r" (offset), "=&r" (buf), "=r" (tmp), "=r" (tmp2) - : "0" (offset), "1" (buf)); - length -= 8; + "str%?h %2, [%0], #4" + : "+r" (offset), "=&r" (tmp), "=&r" (tmp2)); } while (length > 0) { - __asm__ __volatile__("str%?h %2, [%0], #4" + asm volatile("str%?h %2, [%0], #4" : "=&r" (offset) : "0" (offset), "r" (buf[0] | (buf[1] << 8))); buf += 2; length -= 2; } } -static inline void +static void am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned int length) { offset = ISAMEM_BASE + (offset << 1); @@ -140,12 +141,12 @@ am_readbuffer(struct net_device *dev, u_int offset, unsigned char *buf, unsigned length -= 2; } while (length > 8) { - unsigned int tmp, tmp2, tmp3; + register unsigned int tmp asm("r2"), tmp2 asm("r3"), tmp3; asm volatile( "ldr%?h %2, [%0], #4\n\t" + "ldr%?h %4, [%0], #4\n\t" "ldr%?h %3, [%0], #4\n\t" - "orr%? %2, %2, %3, lsl #16\n\t" - "ldr%?h %3, [%0], #4\n\t" + "orr%? %2, %2, %4, lsl #16\n\t" "ldr%?h %4, [%0], #4\n\t" "orr%? %3, %3, %4, lsl #16\n\t" "stm%?ia %1!, {%2, %3}" -- cgit v1.2.3 From fc9b4910b00039da054f221e2821be0519261101 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Sat, 11 Jun 2011 08:39:55 +0000 Subject: net: ep93xx_eth: pass struct device to DMA API functions We shouldn't use NULL for any DMA API functions, unless we are dealing with ISA or EISA device. So pass correct struct dev pointer to these functions. Signed-off-by: Mika Westerberg Signed-off-by: David S. Miller --- drivers/net/arm/ep93xx_eth.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/ep93xx_eth.c b/drivers/net/arm/ep93xx_eth.c index 5a77001b6d10..f65dfb6e5705 100644 --- a/drivers/net/arm/ep93xx_eth.c +++ b/drivers/net/arm/ep93xx_eth.c @@ -284,7 +284,7 @@ static int ep93xx_rx(struct net_device *dev, int processed, int budget) skb = dev_alloc_skb(length + 2); if (likely(skb != NULL)) { skb_reserve(skb, 2); - dma_sync_single_for_cpu(NULL, ep->descs->rdesc[entry].buf_addr, + dma_sync_single_for_cpu(dev->dev.parent, ep->descs->rdesc[entry].buf_addr, length, DMA_FROM_DEVICE); skb_copy_to_linear_data(skb, ep->rx_buf[entry], length); skb_put(skb, length); @@ -362,7 +362,7 @@ static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev) ep->descs->tdesc[entry].tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff); skb_copy_and_csum_dev(skb, ep->tx_buf[entry]); - dma_sync_single_for_cpu(NULL, ep->descs->tdesc[entry].buf_addr, + dma_sync_single_for_cpu(dev->dev.parent, ep->descs->tdesc[entry].buf_addr, skb->len, DMA_TO_DEVICE); dev_kfree_skb(skb); @@ -457,6 +457,7 @@ static irqreturn_t ep93xx_irq(int irq, void *dev_id) static void ep93xx_free_buffers(struct ep93xx_priv *ep) { + struct device *dev = ep->dev->dev.parent; int i; for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) { @@ -464,7 +465,7 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep) d = ep->descs->rdesc[i].buf_addr; if (d) - dma_unmap_single(NULL, d, PAGE_SIZE, DMA_FROM_DEVICE); + dma_unmap_single(dev, d, PAGE_SIZE, DMA_FROM_DEVICE); if (ep->rx_buf[i] != NULL) free_page((unsigned long)ep->rx_buf[i]); @@ -475,13 +476,13 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep) d = ep->descs->tdesc[i].buf_addr; if (d) - dma_unmap_single(NULL, d, PAGE_SIZE, DMA_TO_DEVICE); + dma_unmap_single(dev, d, PAGE_SIZE, DMA_TO_DEVICE); if (ep->tx_buf[i] != NULL) free_page((unsigned long)ep->tx_buf[i]); } - dma_free_coherent(NULL, sizeof(struct ep93xx_descs), ep->descs, + dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs, ep->descs_dma_addr); } @@ -491,9 +492,10 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep) */ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) { + struct device *dev = ep->dev->dev.parent; int i; - ep->descs = dma_alloc_coherent(NULL, sizeof(struct ep93xx_descs), + ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs), &ep->descs_dma_addr, GFP_KERNEL | GFP_DMA); if (ep->descs == NULL) return 1; @@ -506,8 +508,8 @@ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) if (page == NULL) goto err; - d = dma_map_single(NULL, page, PAGE_SIZE, DMA_FROM_DEVICE); - if (dma_mapping_error(NULL, d)) { + d = dma_map_single(dev, page, PAGE_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, d)) { free_page((unsigned long)page); goto err; } @@ -529,8 +531,8 @@ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) if (page == NULL) goto err; - d = dma_map_single(NULL, page, PAGE_SIZE, DMA_TO_DEVICE); - if (dma_mapping_error(NULL, d)) { + d = dma_map_single(dev, page, PAGE_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, d)) { free_page((unsigned long)page); goto err; } @@ -829,6 +831,7 @@ static int ep93xx_eth_probe(struct platform_device *pdev) } ep = netdev_priv(dev); ep->dev = dev; + SET_NETDEV_DEV(dev, &pdev->dev); netif_napi_add(dev, &ep->napi, ep93xx_poll, 64); platform_set_drvdata(pdev, dev); -- cgit v1.2.3 From 3247a1fcee49b571b40c4bd723439ce5c64f56ad Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Sat, 11 Jun 2011 08:39:56 +0000 Subject: net: ep93xx_eth: allocate buffers using kmalloc() We can use simply kmalloc() to allocate the buffers. This also simplifies the code and allows us to perform DMA sync operations more easily. Memory is allocated with only GFP_KERNEL since there are no DMA allocation restrictions on this platform. Signed-off-by: Mika Westerberg Acked-by: Russell King Acked-by: H Hartley Sweeten Tested-by: Petr Stetiar Signed-off-by: David S. Miller --- drivers/net/arm/ep93xx_eth.c | 51 +++++++++++++++++--------------------------- 1 file changed, 20 insertions(+), 31 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/ep93xx_eth.c b/drivers/net/arm/ep93xx_eth.c index f65dfb6e5705..97bf6b10ce61 100644 --- a/drivers/net/arm/ep93xx_eth.c +++ b/drivers/net/arm/ep93xx_eth.c @@ -460,36 +460,32 @@ static void ep93xx_free_buffers(struct ep93xx_priv *ep) struct device *dev = ep->dev->dev.parent; int i; - for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) { + for (i = 0; i < RX_QUEUE_ENTRIES; i++) { dma_addr_t d; d = ep->descs->rdesc[i].buf_addr; if (d) - dma_unmap_single(dev, d, PAGE_SIZE, DMA_FROM_DEVICE); + dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_FROM_DEVICE); if (ep->rx_buf[i] != NULL) - free_page((unsigned long)ep->rx_buf[i]); + kfree(ep->rx_buf[i]); } - for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) { + for (i = 0; i < TX_QUEUE_ENTRIES; i++) { dma_addr_t d; d = ep->descs->tdesc[i].buf_addr; if (d) - dma_unmap_single(dev, d, PAGE_SIZE, DMA_TO_DEVICE); + dma_unmap_single(dev, d, PKT_BUF_SIZE, DMA_TO_DEVICE); if (ep->tx_buf[i] != NULL) - free_page((unsigned long)ep->tx_buf[i]); + kfree(ep->tx_buf[i]); } dma_free_coherent(dev, sizeof(struct ep93xx_descs), ep->descs, ep->descs_dma_addr); } -/* - * The hardware enforces a sub-2K maximum packet size, so we put - * two buffers on every hardware page. - */ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) { struct device *dev = ep->dev->dev.parent; @@ -500,48 +496,41 @@ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) if (ep->descs == NULL) return 1; - for (i = 0; i < RX_QUEUE_ENTRIES; i += 2) { - void *page; + for (i = 0; i < RX_QUEUE_ENTRIES; i++) { + void *buf; dma_addr_t d; - page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); - if (page == NULL) + buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL); + if (buf == NULL) goto err; - d = dma_map_single(dev, page, PAGE_SIZE, DMA_FROM_DEVICE); + d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_FROM_DEVICE); if (dma_mapping_error(dev, d)) { - free_page((unsigned long)page); + kfree(buf); goto err; } - ep->rx_buf[i] = page; + ep->rx_buf[i] = buf; ep->descs->rdesc[i].buf_addr = d; ep->descs->rdesc[i].rdesc1 = (i << 16) | PKT_BUF_SIZE; - - ep->rx_buf[i + 1] = page + PKT_BUF_SIZE; - ep->descs->rdesc[i + 1].buf_addr = d + PKT_BUF_SIZE; - ep->descs->rdesc[i + 1].rdesc1 = ((i + 1) << 16) | PKT_BUF_SIZE; } - for (i = 0; i < TX_QUEUE_ENTRIES; i += 2) { - void *page; + for (i = 0; i < TX_QUEUE_ENTRIES; i++) { + void *buf; dma_addr_t d; - page = (void *)__get_free_page(GFP_KERNEL | GFP_DMA); - if (page == NULL) + buf = kmalloc(PKT_BUF_SIZE, GFP_KERNEL); + if (buf == NULL) goto err; - d = dma_map_single(dev, page, PAGE_SIZE, DMA_TO_DEVICE); + d = dma_map_single(dev, buf, PKT_BUF_SIZE, DMA_TO_DEVICE); if (dma_mapping_error(dev, d)) { - free_page((unsigned long)page); + kfree(buf); goto err; } - ep->tx_buf[i] = page; + ep->tx_buf[i] = buf; ep->descs->tdesc[i].buf_addr = d; - - ep->tx_buf[i + 1] = page + PKT_BUF_SIZE; - ep->descs->tdesc[i + 1].buf_addr = d + PKT_BUF_SIZE; } return 0; -- cgit v1.2.3 From 1f758a4341ac83289a549e6ba2d29a08cf639717 Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Sat, 11 Jun 2011 08:39:57 +0000 Subject: net: ep93xx_eth: drop GFP_DMA from call to dma_alloc_coherent() Commit a197b59ae6e8 (mm: fail GFP_DMA allocations when ZONE_DMA is not configured) made page allocator to return NULL if GFP_DMA is set but CONFIG_ZONE_DMA is disabled. This causes ep93xx_eth to fail: WARNING: at mm/page_alloc.c:2251 __alloc_pages_nodemask+0x11c/0x638() Modules linked in: [] (unwind_backtrace+0x0/0xf4) from [] (warn_slowpath_common+0x48/0x60) [] (warn_slowpath_common+0x48/0x60) from [] (warn_slowpath_null+0x1c/0x24) [] (warn_slowpath_null+0x1c/0x24) from [] (__alloc_pages_nodemask+0x11c/0x638) [] (__alloc_pages_nodemask+0x11c/0x638) from [] (__dma_alloc+0x8c/0x3ec) [] (__dma_alloc+0x8c/0x3ec) from [] (dma_alloc_coherent+0x54/0x60) [] (dma_alloc_coherent+0x54/0x60) from [] (ep93xx_open+0x20/0x864) [] (ep93xx_open+0x20/0x864) from [] (__dev_open+0xb8/0x108) [] (__dev_open+0xb8/0x108) from [] (__dev_change_flags+0x70/0x128) [] (__dev_change_flags+0x70/0x128) from [] (dev_change_flags+0x10/0x48) [] (dev_change_flags+0x10/0x48) from [] (ip_auto_config+0x190/0xf68) [] (ip_auto_config+0x190/0xf68) from [] (do_one_initcall+0x34/0x18c) [] (do_one_initcall+0x34/0x18c) from [] (kernel_init+0x94/0x134) [] (kernel_init+0x94/0x134) from [] (kernel_thread_exit+0x0/0x8) Since there is no restrictions for DMA on ep93xx, we can fix this by just removing the GFP_DMA flag from the call. Signed-off-by: Mika Westerberg Acked-by: Russell King Acked-by: H Hartley Sweeten Tested-by: Petr Stetiar Signed-off-by: David S. Miller --- drivers/net/arm/ep93xx_eth.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/ep93xx_eth.c b/drivers/net/arm/ep93xx_eth.c index 97bf6b10ce61..bef38116abaf 100644 --- a/drivers/net/arm/ep93xx_eth.c +++ b/drivers/net/arm/ep93xx_eth.c @@ -492,7 +492,7 @@ static int ep93xx_alloc_buffers(struct ep93xx_priv *ep) int i; ep->descs = dma_alloc_coherent(dev, sizeof(struct ep93xx_descs), - &ep->descs_dma_addr, GFP_KERNEL | GFP_DMA); + &ep->descs_dma_addr, GFP_KERNEL); if (ep->descs == NULL) return 1; -- cgit v1.2.3 From f1c089e3192f1afdfa76226dc38ef81b08ac810d Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Sat, 11 Jun 2011 08:39:58 +0000 Subject: net: ep93xx_eth: fix DMA API violations Russell King said: > > So, to summarize what its doing: > > 1. It allocates buffers for rx and tx. > 2. It maps them with dma_map_single(). > This transfers ownership of the buffer to the DMA device. > 3. In ep93xx_xmit, > 3a. It copies the data into the buffer with skb_copy_and_csum_dev() > This violates the DMA buffer ownership rules - the CPU should > not be writing to this buffer while it is (in principle) owned > by the DMA device. > 3b. It then calls dma_sync_single_for_cpu() for the buffer. > This transfers ownership of the buffer to the CPU, which surely > is the wrong direction. > 4. In ep93xx_rx, > 4a. It calls dma_sync_single_for_cpu() for the buffer. > This at least transfers the DMA buffer ownership to the CPU > before the CPU reads the buffer > 4b. It then uses skb_copy_to_linear_data() to copy the data out. > At no point does it transfer ownership back to the DMA device. > 5. When the driver is removed, it dma_unmap_single()'s the buffer. > This transfers ownership of the buffer to the CPU. > 6. It frees the buffer. > > While it may work on ep93xx, it's not respecting the DMA API rules, > and with DMA debugging enabled it will probably encounter quite a few > warnings. This patch fixes these violations. Signed-off-by: Mika Westerberg Acked-by: Russell King Acked-by: H Hartley Sweeten Tested-by: Petr Stetiar Signed-off-by: David S. Miller --- drivers/net/arm/ep93xx_eth.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'drivers/net/arm') diff --git a/drivers/net/arm/ep93xx_eth.c b/drivers/net/arm/ep93xx_eth.c index bef38116abaf..0b46b8ea0e80 100644 --- a/drivers/net/arm/ep93xx_eth.c +++ b/drivers/net/arm/ep93xx_eth.c @@ -283,10 +283,14 @@ static int ep93xx_rx(struct net_device *dev, int processed, int budget) skb = dev_alloc_skb(length + 2); if (likely(skb != NULL)) { + struct ep93xx_rdesc *rxd = &ep->descs->rdesc[entry]; skb_reserve(skb, 2); - dma_sync_single_for_cpu(dev->dev.parent, ep->descs->rdesc[entry].buf_addr, + dma_sync_single_for_cpu(dev->dev.parent, rxd->buf_addr, length, DMA_FROM_DEVICE); skb_copy_to_linear_data(skb, ep->rx_buf[entry], length); + dma_sync_single_for_device(dev->dev.parent, + rxd->buf_addr, length, + DMA_FROM_DEVICE); skb_put(skb, length); skb->protocol = eth_type_trans(skb, dev); @@ -348,6 +352,7 @@ poll_some_more: static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev) { struct ep93xx_priv *ep = netdev_priv(dev); + struct ep93xx_tdesc *txd; int entry; if (unlikely(skb->len > MAX_PKT_SIZE)) { @@ -359,11 +364,14 @@ static int ep93xx_xmit(struct sk_buff *skb, struct net_device *dev) entry = ep->tx_pointer; ep->tx_pointer = (ep->tx_pointer + 1) & (TX_QUEUE_ENTRIES - 1); - ep->descs->tdesc[entry].tdesc1 = - TDESC1_EOF | (entry << 16) | (skb->len & 0xfff); + txd = &ep->descs->tdesc[entry]; + + txd->tdesc1 = TDESC1_EOF | (entry << 16) | (skb->len & 0xfff); + dma_sync_single_for_cpu(dev->dev.parent, txd->buf_addr, skb->len, + DMA_TO_DEVICE); skb_copy_and_csum_dev(skb, ep->tx_buf[entry]); - dma_sync_single_for_cpu(dev->dev.parent, ep->descs->tdesc[entry].buf_addr, - skb->len, DMA_TO_DEVICE); + dma_sync_single_for_device(dev->dev.parent, txd->buf_addr, skb->len, + DMA_TO_DEVICE); dev_kfree_skb(skb); spin_lock_irq(&ep->tx_pending_lock); -- cgit v1.2.3