diff options
| author |   Christian Lamparter <chunkeey@gmail.com> | 2017-12-22 21:18:35 +0100 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2018-01-05 18:43:02 +1100 |
| commit | b0a191cebea13c38f3a427180721f92d8e259b81 (patch) | |
| tree | b0e90447c757b6b92cf86c8dd953157b8fe05685 /drivers/crypto | |
| parent | hwrng: exynos - add Samsung Exynos True RNG driver (diff) | |
| download | linux-dev-b0a191cebea13c38f3a427180721f92d8e259b81.tar.xz linux-dev-b0a191cebea13c38f3a427180721f92d8e259b81.zip | |
crypto: crypto4xx - shuffle iomap in front of request_irq
It is possible to avoid the ce_base null pointer check in the
drivers' interrupt handler routine "crypto4xx_ce_interrupt_handler()"
by simply doing the iomap in front of the IRQ registration.
This way, the ce_base will always be valid in the handler and
a branch in an critical path can be avoided.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/amcc/crypto4xx_core.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c index c44954e274bc..50d5e64fbdbf 100644 --- a/drivers/crypto/amcc/crypto4xx_core.c +++ b/drivers/crypto/amcc/crypto4xx_core.c @@ -1075,9 +1075,6 @@ static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data) struct device *dev = (struct device *)data; struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev); - if (!core_dev->dev->ce_base) - return 0; - writel(PPC4XX_INTERRUPT_CLR, core_dev->dev->ce_base + CRYPTO4XX_INT_CLR); tasklet_schedule(&core_dev->tasklet); @@ -1325,13 +1322,6 @@ static int crypto4xx_probe(struct platform_device *ofdev) tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb, (unsigned long) dev); - /* Register for Crypto isr, Crypto Engine IRQ */ - core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); - rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0, - core_dev->dev->name, dev); - if (rc) - goto err_request_irq; - core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0); if (!core_dev->dev->ce_base) { dev_err(dev, "failed to of_iomap\n"); @@ -1339,6 +1329,13 @@ static int crypto4xx_probe(struct platform_device *ofdev) goto err_iomap; } + /* Register for Crypto isr, Crypto Engine IRQ */ + core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0); + rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0, + core_dev->dev->name, dev); + if (rc) + goto err_request_irq; + /* need to setup pdr, rdr, gdr and sdr before this */ crypto4xx_hw_init(core_dev->dev); @@ -1352,11 +1349,11 @@ static int crypto4xx_probe(struct platform_device *ofdev) return 0; err_start_dev: - iounmap(core_dev->dev->ce_base); -err_iomap: free_irq(core_dev->irq, dev); err_request_irq: irq_dispose_mapping(core_dev->irq); + iounmap(core_dev->dev->ce_base); +err_iomap: tasklet_kill(&core_dev->tasklet); err_build_sdr: crypto4xx_destroy_sdr(core_dev->dev); |