Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755969Ab2JEPcJ (ORCPT ); Fri, 5 Oct 2012 11:32:09 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:38332 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755214Ab2JEPcB (ORCPT ); Fri, 5 Oct 2012 11:32:01 -0400 From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: arnd@arndb.de, linus.walleij@stericsson.com, Lee Jones , Samuel Ortiz Subject: [PATCH 01/10] mfd: Prevent STMPE from abusing mfd_add_devices' irq_base parameter Date: Fri, 5 Oct 2012 16:31:37 +0100 Message-Id: <1349451107-8009-2-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1349451107-8009-1-git-send-email-lee.jones@linaro.org> References: <1349451107-8009-1-git-send-email-lee.jones@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3295 Lines: 101 Originally IRQ incrementers were provided in some template resource structures for keypad and touchscreen devices. These were passed as IORESOURCE_IRQs to MFD core in the usual way. The true device IRQs were instead added to the irq_base when mfd_add_devices was invoked. This is clearly an abuse of the call, and does not scale when IRQ Domains are brought into play. Before we can provide the STMPE with its own IRQ Domain we must first fix this. This patche keeps most of the driver's structure, keeping the template strategy. However, instead of providing the IRQ as an increment to irq_base, we dynamically populate the IORESOURCE_IRQ with the correct device IRQ. Cc: Samuel Ortiz Acked-by: Linus Walleij Signed-off-by: Lee Jones --- drivers/mfd/stmpe.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-) diff --git a/drivers/mfd/stmpe.c b/drivers/mfd/stmpe.c index c94f521..ad13cb0 100644 --- a/drivers/mfd/stmpe.c +++ b/drivers/mfd/stmpe.c @@ -310,14 +310,10 @@ static struct mfd_cell stmpe_gpio_cell_noirq = { static struct resource stmpe_keypad_resources[] = { { .name = "KEYPAD", - .start = 0, - .end = 0, .flags = IORESOURCE_IRQ, }, { .name = "KEYPAD_OVER", - .start = 1, - .end = 1, .flags = IORESOURCE_IRQ, }, }; @@ -397,14 +393,10 @@ static struct stmpe_variant_info stmpe801_noirq = { static struct resource stmpe_ts_resources[] = { { .name = "TOUCH_DET", - .start = 0, - .end = 0, .flags = IORESOURCE_IRQ, }, { .name = "FIFO_TH", - .start = 1, - .end = 1, .flags = IORESOURCE_IRQ, }, }; @@ -959,10 +951,10 @@ static int __devinit stmpe_chip_init(struct stmpe *stmpe) } static int __devinit stmpe_add_device(struct stmpe *stmpe, - struct mfd_cell *cell, int irq) + struct mfd_cell *cell) { return mfd_add_devices(stmpe->dev, stmpe->pdata->id, cell, 1, - NULL, stmpe->irq_base + irq, NULL); + NULL, stmpe->irq_base, NULL); } static int __devinit stmpe_devices_init(struct stmpe *stmpe) @@ -970,7 +962,7 @@ static int __devinit stmpe_devices_init(struct stmpe *stmpe) struct stmpe_variant_info *variant = stmpe->variant; unsigned int platform_blocks = stmpe->pdata->blocks; int ret = -EINVAL; - int i; + int i, j; for (i = 0; i < variant->num_blocks; i++) { struct stmpe_variant_block *block = &variant->blocks[i]; @@ -978,8 +970,17 @@ static int __devinit stmpe_devices_init(struct stmpe *stmpe) if (!(platform_blocks & block->block)) continue; + for (j = 0; j < block->cell->num_resources; j++) { + struct resource *res = + (struct resource *) &block->cell->resources[j]; + + /* Dynamically fill in a variant's IRQ. */ + if (res->flags & IORESOURCE_IRQ) + res->start = res->end = block->irq + j; + } + platform_blocks &= ~block->block; - ret = stmpe_add_device(stmpe, block->cell, block->irq); + ret = stmpe_add_device(stmpe, block->cell); if (ret) return ret; } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/