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bf4afc53b7
This was done entirely with mindless brute force, using
git grep -l '\<k[vmz]*alloc_objs*(.*, GFP_KERNEL)' |
xargs sed -i 's/\(alloc_objs*(.*\), GFP_KERNEL)/\1)/'
to convert the new alloc_obj() users that had a simple GFP_KERNEL
argument to just drop that argument.
Note that due to the extreme simplicity of the scripting, any slightly
more complex cases spread over multiple lines would not be triggered:
they definitely exist, but this covers the vast bulk of the cases, and
the resulting diff is also then easier to check automatically.
For the same reason the 'flex' versions will be done as a separate
conversion.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
77 lines
2 KiB
C
77 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* helpers for managing a buffer for many packets
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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*/
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#include <linux/firewire.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include "packets-buffer.h"
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/**
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* iso_packets_buffer_init - allocates the memory for packets
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* @b: the buffer structure to initialize
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* @unit: the device at the other end of the stream
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* @count: the number of packets
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* @packet_size: the (maximum) size of a packet, in bytes
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* @direction: %DMA_TO_DEVICE or %DMA_FROM_DEVICE
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*/
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int iso_packets_buffer_init(struct iso_packets_buffer *b, struct fw_unit *unit,
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unsigned int count, unsigned int packet_size,
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enum dma_data_direction direction)
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{
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unsigned int packets_per_page, pages;
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unsigned int i, page_index, offset_in_page;
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void *p;
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int err;
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b->packets = kmalloc_objs(*b->packets, count);
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if (!b->packets) {
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err = -ENOMEM;
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goto error;
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}
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packet_size = L1_CACHE_ALIGN(packet_size);
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packets_per_page = PAGE_SIZE / packet_size;
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if (WARN_ON(!packets_per_page)) {
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err = -EINVAL;
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goto err_packets;
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}
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pages = DIV_ROUND_UP(count, packets_per_page);
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err = fw_iso_buffer_init(&b->iso_buffer, fw_parent_device(unit)->card,
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pages, direction);
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if (err < 0)
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goto err_packets;
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for (i = 0; i < count; ++i) {
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page_index = i / packets_per_page;
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p = page_address(b->iso_buffer.pages[page_index]);
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offset_in_page = (i % packets_per_page) * packet_size;
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b->packets[i].buffer = p + offset_in_page;
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b->packets[i].offset = page_index * PAGE_SIZE + offset_in_page;
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}
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return 0;
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err_packets:
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kfree(b->packets);
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error:
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return err;
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}
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EXPORT_SYMBOL(iso_packets_buffer_init);
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/**
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* iso_packets_buffer_destroy - frees packet buffer resources
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* @b: the buffer structure to free
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* @unit: the device at the other end of the stream
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*/
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void iso_packets_buffer_destroy(struct iso_packets_buffer *b,
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struct fw_unit *unit)
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{
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fw_iso_buffer_destroy(&b->iso_buffer, fw_parent_device(unit)->card);
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kfree(b->packets);
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}
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EXPORT_SYMBOL(iso_packets_buffer_destroy);
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