diff options
Diffstat (limited to 'target/linux/apm821xx/patches-4.14/021-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch')
| -rw-r--r-- | target/linux/apm821xx/patches-4.14/021-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/target/linux/apm821xx/patches-4.14/021-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch b/target/linux/apm821xx/patches-4.14/021-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch new file mode 100644 index 0000000000..fc8df38867 --- /dev/null +++ b/target/linux/apm821xx/patches-4.14/021-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch @@ -0,0 +1,71 @@ +From 4baa099377d73ea99c7802a9685815b32e8bf119 Mon Sep 17 00:00:00 2001 +From: Christian Lamparter <chunkeey@gmail.com> +Date: Thu, 21 Dec 2017 15:08:18 +0100 +Subject: [PATCH 1/6] 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> +--- + drivers/crypto/amcc/crypto4xx_core.c | 21 +++++++++------------ + 1 file changed, 9 insertions(+), 12 deletions(-) + +--- a/drivers/crypto/amcc/crypto4xx_core.c ++++ b/drivers/crypto/amcc/crypto4xx_core.c +@@ -1075,9 +1075,6 @@ static irqreturn_t crypto4xx_ce_interrup + 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 platfo + 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 platfo + 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 platfo + 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); |