Commit 3862de1f authored Apr 15, 2013 by Vakul Garg Committed by Herbert Xu Apr 25, 2013

crypto: caam - fix job ring cleanup code



The job ring init function creates a platform device for each job ring.
While the job ring is shutdown, e.g. while caam module removal, its
platform device was not being removed. This leads to failure while
reinsertion and then removal of caam module second time.

The following kernel crash dump appears when caam module is reinserted
and then removed again. This patch fixes it.

root@p4080ds:~# rmmod caam.ko
Unable to handle kernel paging request for data at address 0x00000008
Faulting instruction address: 0xf94aca18
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=8 P4080 DS
Modules linked in: caam(-) qoriq_dbg(O) [last unloaded: caam]
NIP: f94aca18 LR: f94aca18 CTR: c029f950
REGS: eac47d60 TRAP: 0300   Tainted: G           O  (3.8.4-rt2)
MSR: 00029002 <CE,EE,ME>  CR: 22022484  XER: 20000000
DEAR: 00000008, ESR: 00000000
TASK = e49dfaf0[2110] 'rmmod' THREAD: eac46000 CPU: 1
GPR00: f94ad3f4 eac47e10 e49dfaf0 00000000 00000005 ea2ac210 ffffffff 00000000
GPR08: c286de68 e4977ce0 c029b1c0 00000001 c029f950 10029738 00000000 100e0000
GPR16: 00000000 10023d00 1000cbdc 1000cb8c 1000cbb8 00000000 c07dfecc 00000000
GPR24: c07e0000 00000000 1000cbd8 f94e0000 ffffffff 00000000 ea53cd40 00000000
NIP [f94aca18] caam_reset_hw_jr+0x18/0x1c0 [caam]
LR [f94aca18] caam_reset_hw_jr+0x18/0x1c0 [caam]
Call Trace:
[eac47e10] [eac47e30] 0xeac47e30 (unreliable)
[eac47e20] [f94ad3f4] caam_jr_shutdown+0x34/0x220 [caam]
[eac47e60] [f94ac0e4] caam_remove+0x54/0xb0 [caam]
[eac47e80] [c029fb38] __device_release_driver+0x68/0x120
[eac47e90] [c02a05c8] driver_detach+0xd8/0xe0
[eac47eb0] [c029f8e0] bus_remove_driver+0xa0/0x110
[eac47ed0] [c00768e4] sys_delete_module+0x144/0x270
[eac47f40] [c000e2f0] ret_from_syscall+0x0/0x3c

Signed-off-by: Vakul Garg <vakul@freescale.com>
Signed-off-by: Bharat Bhushan <bharat.bhushan@freescale.com>
Reviewed-by: Horia Geanta <horia.geanta@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent f3f935a7

drivers/crypto/caam/intern.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -41,6 +41,7 @@ struct caam_jrentry_info {
		/* Private sub-storage for a single JobR */
		struct caam_drv_private_jr {
		struct device parentdev; / points back to controller dev */
		struct platform_device jr_pdev;/ points to platform device for JR */
		int ridx;
		struct caam_job_ring __iomem rregs; / JobR's register space */
		struct tasklet_struct irqtask;

drivers/crypto/caam/jr.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -407,6 +407,7 @@ int caam_jr_shutdown(struct device *dev)
		dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
		jrp->outring, outbusaddr);
		kfree(jrp->entinfo);
		of_device_unregister(jrp->jr_pdev);

		return ret;
		}
		@@ -454,6 +455,8 @@ int caam_jr_probe(struct platform_device pdev, struct device_node np,
		kfree(jrpriv);
		return -EINVAL;
		}

		jrpriv->jr_pdev = jr_pdev;
		jrdev = &jr_pdev->dev;
		dev_set_drvdata(jrdev, jrpriv);
		ctrlpriv->jrdev[ring] = jrdev;
		@@ -472,6 +475,7 @@ int caam_jr_probe(struct platform_device pdev, struct device_node np,
		/* Now do the platform independent part */
		error = caam_jr_init(jrdev); /* now turn on hardware */
		if (error) {
		of_device_unregister(jr_pdev);
		kfree(jrpriv);
		return error;
		}

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