target/linux/apm821xx/patches-4.14/120-0001-crypto-crypto4xx-shuffle-iomap-in-front-of-request_i.patch

   1 From 4baa099377d73ea99c7802a9685815b32e8bf119 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Thu, 21 Dec 2017 15:08:18 +0100
   4 Subject: [PATCH 1/6] crypto: crypto4xx - shuffle iomap in front of request_irq
   5
   6 It is possible to avoid the ce_base null pointer check in the
   7 drivers' interrupt handler routine "crypto4xx_ce_interrupt_handler()"
   8 by simply doing the iomap in front of the IRQ registration.
   9
  10 This way, the ce_base will always be valid in the handler and
  11 a branch in an critical path can be avoided.
  12
  13 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
  14 ---
  15  drivers/crypto/amcc/crypto4xx_core.c | 21 +++++++++------------
  16  1 file changed, 9 insertions(+), 12 deletions(-)
  17
  18 --- a/drivers/crypto/amcc/crypto4xx_core.c
  19 +++ b/drivers/crypto/amcc/crypto4xx_core.c
  20 @@ -1075,9 +1075,6 @@ static irqreturn_t crypto4xx_ce_interrup
  21         struct device *dev = (struct device *)data;
  22         struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
  23
  24 -       if (!core_dev->dev->ce_base)
  25 -               return 0;
  26 -
  27         writel(PPC4XX_INTERRUPT_CLR,
  28                core_dev->dev->ce_base + CRYPTO4XX_INT_CLR);
  29         tasklet_schedule(&core_dev->tasklet);
  30 @@ -1325,13 +1322,6 @@ static int crypto4xx_probe(struct platfo
  31         tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb,
  32                      (unsigned long) dev);
  33
  34 -       /* Register for Crypto isr, Crypto Engine IRQ */
  35 -       core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
  36 -       rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0,
  37 -                        core_dev->dev->name, dev);
  38 -       if (rc)
  39 -               goto err_request_irq;
  40 -
  41         core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0);
  42         if (!core_dev->dev->ce_base) {
  43                 dev_err(dev, "failed to of_iomap\n");
  44 @@ -1339,6 +1329,13 @@ static int crypto4xx_probe(struct platfo
  45                 goto err_iomap;
  46         }
  47
  48 +       /* Register for Crypto isr, Crypto Engine IRQ */
  49 +       core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
  50 +       rc = request_irq(core_dev->irq, crypto4xx_ce_interrupt_handler, 0,
  51 +                        core_dev->dev->name, dev);
  52 +       if (rc)
  53 +               goto err_request_irq;
  54 +
  55         /* need to setup pdr, rdr, gdr and sdr before this */
  56         crypto4xx_hw_init(core_dev->dev);
  57
  58 @@ -1352,11 +1349,11 @@ static int crypto4xx_probe(struct platfo
  59         return 0;
  60
  61  err_start_dev:
  62 -       iounmap(core_dev->dev->ce_base);
  63 -err_iomap:
  64         free_irq(core_dev->irq, dev);
  65  err_request_irq:
  66         irq_dispose_mapping(core_dev->irq);
  67 +       iounmap(core_dev->dev->ce_base);
  68 +err_iomap:
  69         tasklet_kill(&core_dev->tasklet);
  70  err_build_sdr:
  71         crypto4xx_destroy_sdr(core_dev->dev);