From e2a8f7a129aff5173c238c8896f004e07a2a3abe Mon Sep 17 00:00:00 2001 From: Kylene Jo Hall Date: Mon, 7 Nov 2005 00:59:25 -0800 Subject: [PATCH] [PATCH] tpm: Fix lack of driver_unregister in init failcases driver_unregister is not being properly called when the init function returns an error case. Restructured the return logic such that this and the other cleanups all happen in one place. Preformed many of the cleanups that Andrew Morton's patch on Thursday made in tpm_atmel.c. Fixed Matthieu's concern about writing before discovery. (akpm: rmk said: This driver is buggy. You must not provide your own release function - it doesn't solve the problem which the warning (which you get when you don't provide one) is telling you about. You should convert your device driver over to the replacement dynamic platform support, once it is merged. IOW, something like: pdev = platform_device_alloc("mydev", id); if (pdev) { err = platform_device_add_resources(pdev, &resources, ARRAY_SIZE(resources)); if (err == 0) err = platform_device_add_data(pdev, &platform_data, sizeof(platform_data)); if (err == 0) err = platform_device_add(pdev); } else { err = -ENOMEM; } if (err) platform_device_put(pdev); ) Signed-off-by: Kylene Jo Hall Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/char/tpm/tpm_nsc.c | 48 ++++++++++++++++++-------------------- 1 file changed, 23 insertions(+), 25 deletions(-) diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c index 8d125c974a2d..680a8e331887 100644 --- a/drivers/char/tpm/tpm_nsc.c +++ b/drivers/char/tpm/tpm_nsc.c @@ -287,10 +287,6 @@ static int __init init_nsc(void) int lo, hi; int nscAddrBase = TPM_ADDR; - driver_register(&nsc_drv); - - /* select PM channel 1 */ - tpm_write_index(nscAddrBase,NSC_LDN_INDEX, 0x12); /* verify that it is a National part (SID) */ if (tpm_read_index(TPM_ADDR, NSC_SID_INDEX) != 0xEF) { @@ -300,6 +296,8 @@ static int __init init_nsc(void) return -ENODEV; } + driver_register(&nsc_drv); + hi = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_HI); lo = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_LO); tpm_nsc.base = (hi<<8) | lo; @@ -307,11 +305,11 @@ static int __init init_nsc(void) /* enable the DPM module */ tpm_write_index(nscAddrBase, NSC_LDC_INDEX, 0x01); - pdev = kmalloc(sizeof(struct platform_device), GFP_KERNEL); - if ( !pdev ) - return -ENOMEM; - - memset(pdev, 0, sizeof(struct platform_device)); + pdev = kzalloc(sizeof(struct platform_device), GFP_KERNEL); + if (!pdev) { + rc = -ENOMEM; + goto err_unreg_drv; + } pdev->name = "tpm_nscl0"; pdev->id = -1; @@ -319,26 +317,16 @@ static int __init init_nsc(void) pdev->dev.release = tpm_nsc_remove; pdev->dev.driver = &nsc_drv; - if ((rc=platform_device_register(pdev)) < 0) { - kfree(pdev); - pdev = NULL; - return rc; - } + if ((rc = platform_device_register(pdev)) < 0) + goto err_free_dev; if (request_region(tpm_nsc.base, 2, "tpm_nsc0") == NULL ) { - platform_device_unregister(pdev); - kfree(pdev); - pdev = NULL; - return -EBUSY; + rc = -EBUSY; + goto err_unreg_dev; } - if ((rc = tpm_register_hardware(&pdev->dev, &tpm_nsc)) < 0) { - release_region(tpm_nsc.base, 2); - platform_device_unregister(pdev); - kfree(pdev); - pdev = NULL; - return rc; - } + if ((rc = tpm_register_hardware(&pdev->dev, &tpm_nsc)) < 0) + goto err_rel_reg; dev_dbg(&pdev->dev, "NSC TPM detected\n"); dev_dbg(&pdev->dev, @@ -374,6 +362,16 @@ static int __init init_nsc(void) tpm_read_index(nscAddrBase, 0x27) & 0x1F); return 0; + +err_rel_reg: + release_region(tpm_nsc.base, 2); +err_unreg_dev: + platform_device_unregister(pdev); +err_free_dev: + kfree(pdev); +err_unreg_drv: + driver_unregister(&nsc_drv); + return rc; } static void __exit cleanup_nsc(void) -- GitLab