/* * Sample fifo dma implementation * * Copyright (C) 2010 Stefani Seibold * * Released under the GPL version 2 only. * */ #include #include #include /* * This module shows how to handle fifo dma operations. */ /* fifo size in elements (bytes) */ #define FIFO_SIZE 32 static struct kfifo fifo; static int __init example_init(void) { int i; unsigned int ret; unsigned int nents; struct scatterlist sg[10]; printk(KERN_INFO "DMA fifo test start\n"); if (kfifo_alloc(&fifo, FIFO_SIZE, GFP_KERNEL)) { printk(KERN_WARNING "error kfifo_alloc\n"); return -ENOMEM; } printk(KERN_INFO "queue size: %u\n", kfifo_size(&fifo)); kfifo_in(&fifo, "test", 4); for (i = 0; i != 9; i++) kfifo_put(&fifo, i); /* kick away first byte */ kfifo_skip(&fifo); printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo)); /* * Configure the kfifo buffer to receive data from DMA input. * * .--------------------------------------. * | 0 | 1 | 2 | ... | 12 | 13 | ... | 31 | * |---|------------------|---------------| * \_/ \________________/ \_____________/ * \ \ \ * \ \_allocated data \ * \_*free space* \_*free space* * * We need two different SG entries: one for the free space area at the * end of the kfifo buffer (19 bytes) and another for the first free * byte at the beginning, after the kfifo_skip(). */ sg_init_table(sg, ARRAY_SIZE(sg)); nents = kfifo_dma_in_prepare(&fifo, sg, ARRAY_SIZE(sg), FIFO_SIZE); printk(KERN_INFO "DMA sgl entries: %d\n", nents); if (!nents) { /* fifo is full and no sgl was created */ printk(KERN_WARNING "error kfifo_dma_in_prepare\n"); return -EIO; } /* receive data */ printk(KERN_INFO "scatterlist for receive:\n"); for (i = 0; i < nents; i++) { printk(KERN_INFO "sg[%d] -> " "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n", i, sg[i].page_link, sg[i].offset, sg[i].length); if (sg_is_last(&sg[i])) break; } /* put here your code to setup and exectute the dma operation */ /* ... */ /* example: zero bytes received */ ret = 0; /* finish the dma operation and update the received data */ kfifo_dma_in_finish(&fifo, ret); /* Prepare to transmit data, example: 8 bytes */ nents = kfifo_dma_out_prepare(&fifo, sg, ARRAY_SIZE(sg), 8); printk(KERN_INFO "DMA sgl entries: %d\n", nents); if (!nents) { /* no data was available and no sgl was created */ printk(KERN_WARNING "error kfifo_dma_out_prepare\n"); return -EIO; } printk(KERN_INFO "scatterlist for transmit:\n"); for (i = 0; i < nents; i++) { printk(KERN_INFO "sg[%d] -> " "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n", i, sg[i].page_link, sg[i].offset, sg[i].length); if (sg_is_last(&sg[i])) break; } /* put here your code to setup and exectute the dma operation */ /* ... */ /* example: 5 bytes transmitted */ ret = 5; /* finish the dma operation and update the transmitted data */ kfifo_dma_out_finish(&fifo, ret); ret = kfifo_len(&fifo); printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo)); if (ret != 7) { printk(KERN_WARNING "size mismatch: test failed"); return -EIO; } printk(KERN_INFO "test passed\n"); return 0; } static void __exit example_exit(void) { kfifo_free(&fifo); } module_init(example_init); module_exit(example_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Stefani Seibold "); git.cgi/linux/net-next.git/log/include/crypto/kpp.h?h=nds-private-remove&id=b699b71d82e77203be43bda5ff1b72516f129581&showmsg=1'>Expand)AuthorFilesLines t name='context' onchange='this.form.submit();'>space:mode:
authorChristophe JAILLET <christophe.jaillet@wanadoo.fr>2017-01-31 00:47:30 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2017-01-31 00:51:06 -0800
commit05e0be7c900797e9164976a6014d534ce3035909 (patch)
tree6064ddf732b21c686c958cb9da73f6eae6de5a27 /net/ipv6/anycast.c
parent3f5c34c6d4688b3b7e1dbc7bbc68a2f03a0d6b0c (diff)
Input: synaptics-rmi4 - fix reversed conditions in enable/disable_irq_wake
These tests are reversed. A warning should be displayed if an error is returned, not on success. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'net/ipv6/anycast.c')