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Provide a check in all the kfifo examples to validate the correct
execution of each testcase.
Signed-off-by: Andrea Righi <arighi@develer.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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We use a dynamically allocated kfifo in the dma example, so we need to
free it when unloading the module.
Signed-off-by: Andrea Righi <arighi@develer.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The scatterlist is used uninitialized in kfifo_dma_in_prepare(). This
triggers the following bug if CONFIG_DEBUG_SG=y:
------------[ cut here ]------------
kernel BUG at include/linux/scatterlist.h:65!
invalid opcode: 0000 [#1] PREEMPT SMP
...
Call Trace:
[<ffffffff810a1eab>] setup_sgl+0x6b/0xe0
[<ffffffffa03d7000>] ? example_init+0x0/0x265 [dma_example]
[<ffffffff810a2021>] __kfifo_dma_in_prepare+0x21/0x30
[<ffffffffa03d7124>] example_init+0x124/0x265 [dma_example]
[<ffffffff810f9c55>] ? trace_module_notify+0x25/0x370
[<ffffffff81110c6e>] ? free_pages_prepare+0x11e/0x1e0
[<ffffffff8106f2b1>] ? get_parent_ip+0x11/0x50
[<ffffffff810f9c55>] ? trace_module_notify+0x25/0x370
[<ffffffff810b65fd>] ? trace_hardirqs_on+0xd/0x10
[<ffffffff814beade>] ? mutex_unlock+0xe/0x10
[<ffffffff810f9c71>] ? trace_module_notify+0x41/0x370
[<ffffffff810a77d5>] ? __blocking_notifier_call_chain+0x45/0x80
[<ffffffff81137b7a>] ? vfree+0x2a/0x30
[<ffffffff810a6ac3>] ? up_read+0x23/0x40
[<ffffffff810a77f5>] ? __blocking_notifier_call_chain+0x65/0x80
[<ffffffff810001e3>] do_one_initcall+0x43/0x180
[<ffffffff810c577a>] sys_init_module+0xba/0x200
[<ffffffff8103819b>] system_call_fastpath+0x16/0x1b
RIP [<ffffffff810a1e31>] setup_sgl_buf+0x1a1/0x1b0
RSP <ffff88006720dc98>
---[ end trace a72b979fd3c1d3a5 ]---
Add the proper initialization to avoid the bug.
Signed-off-by: Andrea Righi <arighi@develer.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Add four examples to the kernel sample directory.
It shows how to handle:
- a byte stream fifo
- a integer type fifo
- a dynamic record sized fifo
- the fifo DMA functions
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Stefani Seibold <stefani@seibold.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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