From 7bad2cc062b343575f19d5de6be3f297a1429f37 Mon Sep 17 00:00:00 2001 From: Corentin LABBE Date: Fri, 26 Aug 2016 13:11:34 +0200 Subject: [PATCH] hwrng: amd - Replace global variable with private struct Instead of having two global variable, it's better to use a private struct. This will permit to remove amd_pdev variable Signed-off-by: LABBE Corentin Signed-off-by: Herbert Xu --- drivers/char/hw_random/amd-rng.c | 57 +++++++++++++++++++++----------- 1 file changed, 38 insertions(+), 19 deletions(-) diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c index 383e1974234d..4ef94e9b9fe7 100644 --- a/drivers/char/hw_random/amd-rng.c +++ b/drivers/char/hw_random/amd-rng.c @@ -47,15 +47,18 @@ static const struct pci_device_id pci_tbl[] = { }; MODULE_DEVICE_TABLE(pci, pci_tbl); -static struct pci_dev *amd_pdev; +struct amd768_priv { + struct pci_dev *pcidev; + u32 pmbase; +}; static int amd_rng_data_present(struct hwrng *rng, int wait) { - u32 pmbase = (u32)rng->priv; + struct amd768_priv *priv = (struct amd768_priv *)rng->priv; int data, i; for (i = 0; i < 20; i++) { - data = !!(inl(pmbase + 0xF4) & 1); + data = !!(inl(priv->pmbase + 0xF4) & 1); if (data || !wait) break; udelay(10); @@ -65,35 +68,37 @@ static int amd_rng_data_present(struct hwrng *rng, int wait) static int amd_rng_data_read(struct hwrng *rng, u32 *data) { - u32 pmbase = (u32)rng->priv; + struct amd768_priv *priv = (struct amd768_priv *)rng->priv; - *data = inl(pmbase + 0xF0); + *data = inl(priv->pmbase + 0xF0); return 4; } static int amd_rng_init(struct hwrng *rng) { + struct amd768_priv *priv = (struct amd768_priv *)rng->priv; u8 rnen; - pci_read_config_byte(amd_pdev, 0x40, &rnen); + pci_read_config_byte(priv->pcidev, 0x40, &rnen); rnen |= BIT(7); /* RNG on */ - pci_write_config_byte(amd_pdev, 0x40, rnen); + pci_write_config_byte(priv->pcidev, 0x40, rnen); - pci_read_config_byte(amd_pdev, 0x41, &rnen); + pci_read_config_byte(priv->pcidev, 0x41, &rnen); rnen |= BIT(7); /* PMIO enable */ - pci_write_config_byte(amd_pdev, 0x41, rnen); + pci_write_config_byte(priv->pcidev, 0x41, rnen); return 0; } static void amd_rng_cleanup(struct hwrng *rng) { + struct amd768_priv *priv = (struct amd768_priv *)rng->priv; u8 rnen; - pci_read_config_byte(amd_pdev, 0x40, &rnen); + pci_read_config_byte(priv->pcidev, 0x40, &rnen); rnen &= ~BIT(7); /* RNG off */ - pci_write_config_byte(amd_pdev, 0x40, rnen); + pci_write_config_byte(priv->pcidev, 0x40, rnen); } static struct hwrng amd_rng = { @@ -110,6 +115,7 @@ static int __init mod_init(void) struct pci_dev *pdev = NULL; const struct pci_device_id *ent; u32 pmbase; + struct amd768_priv *priv; for_each_pci_dev(pdev) { ent = pci_match_id(pci_tbl, pdev); @@ -117,24 +123,30 @@ static int __init mod_init(void) goto found; } /* Device not found. */ - goto out; + return -ENODEV; found: err = pci_read_config_dword(pdev, 0x58, &pmbase); if (err) - goto out; - err = -EIO; + return err; + pmbase &= 0x0000FF00; if (pmbase == 0) - goto out; + return -EIO; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + if (!request_region(pmbase + 0xF0, 8, DRV_NAME)) { dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n", pmbase + 0xF0); err = -EBUSY; goto out; } - amd_rng.priv = (unsigned long)pmbase; - amd_pdev = pdev; + amd_rng.priv = (unsigned long)priv; + priv->pmbase = pmbase; + priv->pcidev = pdev; pr_info(DRV_NAME " detected\n"); err = hwrng_register(&amd_rng); @@ -143,17 +155,24 @@ found: release_region(pmbase + 0xF0, 8); goto out; } + return 0; + out: + kfree(priv); return err; } static void __exit mod_exit(void) { - u32 pmbase = (unsigned long)amd_rng.priv; + struct amd768_priv *priv; + + priv = (struct amd768_priv *)amd_rng.priv; hwrng_unregister(&amd_rng); - release_region(pmbase + 0xF0, 8); + release_region(priv->pmbase + 0xF0, 8); + + kfree(priv); } module_init(mod_init); -- 2.34.1