Hi, ALl:
When I add the hardware device driver for crypto, i get the bellow
error information. My kernel is 2.6.26
[ 319.938873] BUG: scheduling while atomic: kcryptd/3676/0x00000002
[ 319.938920] Pid: 3676, comm: kcryptd Tainted: P 2.6.26-2-amd64 #1
[ 319.938922]
[ 319.938922] Call Trace:
[ 319.938926] [<ffffffff80427cd4>] schedule+0x95/0x635
[ 319.938934] [<ffffffffa0eb629b>] :libfpga:fpga_dma_open+0xa5/0xab
[ 319.938941] [<ffffffffa0eb67ea>] :libfpga:fpga_dma_block_read+0x12b/0x167
[ 319.938945] [<ffffffff802461c5>] autoremove_wake_function+0x0/0x2e
[ 319.938954] [<ffffffffa039a248>] :dsi_aes:dsi_aes_crypt+0x1db/0x24b
[ 319.938960] [<ffffffffa03a832a>] :cbc:crypto_cbc_encrypt+0xe6/0x138
[ 319.938964] [<ffffffffa039e043>] :aes_generic:aes_encrypt+0x0/0x21
[ 319.938980] [<ffffffffa0384f6f>] :crypto_blkcipher:async_encrypt+0x35/0x3a
[ 319.938986] [<ffffffffa03eea0b>] :dm_crypt:crypt_convert+0x1de/0x261
[ 319.938995] [<ffffffffa03eec6e>] :dm_crypt:kcryptd_crypt+0x1e0/0x2c5
[ 319.939007] [<ffffffffa03eea8e>] :dm_crypt:kcryptd_crypt+0x0/0x2c5
[ 319.939012] [<ffffffff802430c8>] run_workqueue+0x82/0x111
[ 319.939016] [<ffffffff80243995>] worker_thread+0xd5/0xe0
[ 319.939019] [<ffffffff802461c5>] autoremove_wake_function+0x0/0x2e
[ 319.939024] [<ffffffff802438c0>] worker_thread+0x0/0xe0
[ 319.939026] [<ffffffff8024609f>] kthread+0x47/0x74
[ 319.939030] [<ffffffff8020cf28>] child_rip+0xa/0x12
[ 319.939041] [<ffffffff80246058>] kthread+0x0/0x74
[ 319.939043] [<ffffffff8020cf1e>] child_rip+0x0/0x12
I think it is happed when calling the
wait_event_interruptible(fdev->wait) routine, but i don't know how to
fix it. Hope can get you help. Thanks!
The encryption calling tree and irq handler tree showed in bellow
/* ecryption callint tree */
aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
|-->dsi_aes_crypt((unsigned int *)in, (unsigned int *) out);
|-->do_crypt
|-->down_interruptible(&fpga->sem)
fpga_dma_block_write()
|--> fpga_dma_block_transfer(base, pcie_addr, local_addr,
size, flag | FPGA_DMA_READ_FLAG); /*write data to hardware */
|-->wait_event_interruptible(fdev->wait) /* waiting event*/
up()
/* interrupt calling tree */
pci_fpga_handler(int irq, void *arg)
|-->schedule_work(&fpga.work);
|-->fpga_work_task(struct work_struct *work)
|--> spin_lock() /*lock*/
wake_up_interruptible(&fpga.wait); /**/
spin_unlock_irqrestore(&fpga.lock, flags);
The fpga.work and fpga.wait define is
init_waitqueue_head(&fpga.wait);
INIT_WORK(&fpga.work, fpga_work_task);
Best Regards
Bai Shuwei
--
Love other people, as same as love yourself!
Don't think all the time, do it by your hands!
E-Mail: baishuwei@xxxxxxxxx
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