From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753040AbcAEUjS (ORCPT ); Tue, 5 Jan 2016 15:39:18 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:44767 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752813AbcAETqr (ORCPT ); Tue, 5 Jan 2016 14:46:47 -0500 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Andy Shevchenko , Mark Brown , Kamal Mostafa Subject: [PATCH 4.2.y-ckt 050/211] spi: dw: explicitly free IRQ handler in dw_spi_remove_host() Date: Tue, 5 Jan 2016 11:42:38 -0800 Message-Id: <1452023119-25647-51-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1452023119-25647-1-git-send-email-kamal@canonical.com> References: <1452023119-25647-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 4.2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.2.8-ckt1 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Andy Shevchenko commit 02f20387e1bca550639c37b1945f20cd32ddfcce upstream. The following warning occurs when DW SPI is compiled as a module and it's a PCI device. On the removal stage pcibios_free_irq() is called earlier than free_irq() due to the latter is called at managed resources free strage. ------------[ cut here ]------------ WARNING: CPU: 1 PID: 1003 at /home/andy/prj/linux/fs/proc/generic.c:575 remove_proc_entry+0x118/0x150() remove_proc_entry: removing non-empty directory 'irq/38', leaking at least 'dw_spi1' Modules linked in: spi_dw_midpci(-) spi_dw [last unloaded: dw_dmac_core] CPU: 1 PID: 1003 Comm: modprobe Not tainted 4.3.0-rc5-next-20151013+ #32 00000000 00000000 f5535d70 c12dc220 f5535db0 f5535da0 c104e912 c198a6bc f5535dcc 000003eb c198a638 0000023f c11b4098 c11b4098 f54f1ec8 f54f1ea0 f642ba20 f5535db8 c104e96e 00000009 f5535db0 c198a6bc f5535dcc f5535df0 Call Trace: [] dump_stack+0x41/0x61 [] warn_slowpath_common+0x82/0xb0 [] ? remove_proc_entry+0x118/0x150 [] ? remove_proc_entry+0x118/0x150 [] warn_slowpath_fmt+0x2e/0x30 [] remove_proc_entry+0x118/0x150 [] unregister_irq_proc+0xaa/0xc0 [] free_desc+0x1e/0x60 [] irq_free_descs+0x32/0x70 [] irq_domain_free_irqs+0x120/0x150 [] mp_unmap_irq+0x5c/0x60 [] intel_mid_pci_irq_disable+0x20/0x40 [] pcibios_free_irq+0xf/0x20 [] pci_device_remove+0x52/0xb0 [] __device_release_driver+0x77/0x100 [] driver_detach+0x87/0x90 [] bus_remove_driver+0x4a/0xc0 [] ? selinux_capable+0xd/0x10 [] driver_unregister+0x23/0x60 [] ? find_module_all+0x5a/0x80 [] pci_unregister_driver+0x13/0x60 [] dw_spi_driver_exit+0xd/0xf [spi_dw_midpci] [] SyS_delete_module+0x17a/0x210 Explicitly call free_irq() at removal stage of the DW SPI driver. Fixes: 04f421e7b0b1 (spi: dw: use managed resources) Signed-off-by: Andy Shevchenko Signed-off-by: Mark Brown [ kamal: backport to 4.2-stable: context ] Signed-off-by: Kamal Mostafa --- drivers/spi/spi-dw.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 4fbfcdc..0f9d6c1 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -527,8 +527,7 @@ int dw_spi_add_host(struct device *dev, struct dw_spi *dws) dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60); snprintf(dws->name, sizeof(dws->name), "dw_spi%d", dws->bus_num); - ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED, - dws->name, master); + ret = request_irq(dws->irq, dw_spi_irq, IRQF_SHARED, dws->name, master); if (ret < 0) { dev_err(&master->dev, "can not get IRQ\n"); goto err_free_master; @@ -573,6 +572,7 @@ err_dma_exit: if (dws->dma_ops && dws->dma_ops->dma_exit) dws->dma_ops->dma_exit(dws); spi_enable_chip(dws, 0); + free_irq(dws->irq, master); err_free_master: spi_master_put(master); return ret; @@ -590,6 +590,8 @@ void dw_spi_remove_host(struct dw_spi *dws) spi_enable_chip(dws, 0); /* Disable clk */ spi_set_clk(dws, 0); + + free_irq(dws->irq, dws->master); } EXPORT_SYMBOL_GPL(dw_spi_remove_host); -- 1.9.1