From f557978745bbea2e7305588d33aac60f4dd42447 Mon Sep 17 00:00:00 2001 From: Grazvydas Ignotas Date: Thu, 12 Jan 2012 15:21:38 +0200 Subject: usb: musb: drop superfluous pm_runtime calls around musb_shutdown Since commit 4f9edd2d7e8d "usb: musb: Fix the crash issue during reboot" musb_shutdown() does pm_runtime_get_sync/pm_runtime_put by itself, so this no longer needs to be done by the caller. Also, musb_exit_debugfs() doesn't access the device, so just drop those runtime_pm calls. Signed-off-by: Grazvydas Ignotas Reviewed-by: Shubhrajyoti D Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_core.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 56cf0243979e..6a929859b55a 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2111,11 +2111,9 @@ static int __exit musb_remove(struct platform_device *pdev) * - Peripheral mode: peripheral is deactivated (or never-activated) * - OTG mode: both roles are deactivated (or never-activated) */ - pm_runtime_get_sync(musb->controller); musb_exit_debugfs(musb); musb_shutdown(pdev); - pm_runtime_put(musb->controller); musb_free(musb); iounmap(ctrl_base); device_init_wakeup(&pdev->dev, 0); -- cgit v1.2.2 From e9e8c85e69310141d78daaecd6a56138700ac317 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Thu, 26 Jan 2012 12:40:23 +0200 Subject: usb: musb: make modules behave better There's really no point in doing all that initcall trickery when we can safely let udev handle module probing for us. Remove all of that trickery, by moving everybody to module_init() and making proper use of platform_device_register() rather than platform_device_probe(). Tested-by: Rajashekhara, Sudhakar Tested-by: Tasslehoff Kjappfot Signed-off-by: Felipe Balbi --- drivers/usb/musb/am35x.c | 11 ++++----- drivers/usb/musb/blackfin.c | 9 ++++---- drivers/usb/musb/da8xx.c | 11 ++++----- drivers/usb/musb/davinci.c | 11 ++++----- drivers/usb/musb/musb_core.c | 49 +++++++++++++++++++---------------------- drivers/usb/musb/musb_debugfs.c | 2 +- drivers/usb/musb/musb_gadget.c | 6 ++--- drivers/usb/musb/omap2430.c | 11 ++++----- drivers/usb/musb/tusb6010.c | 11 ++++----- drivers/usb/musb/ux500.c | 11 ++++----- 10 files changed, 68 insertions(+), 64 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/musb/am35x.c b/drivers/usb/musb/am35x.c index e233d2b7d335..5285bda1dc4e 100644 --- a/drivers/usb/musb/am35x.c +++ b/drivers/usb/musb/am35x.c @@ -456,7 +456,7 @@ static const struct musb_platform_ops am35x_ops = { static u64 am35x_dmamask = DMA_BIT_MASK(32); -static int __init am35x_probe(struct platform_device *pdev) +static int __devinit am35x_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -561,7 +561,7 @@ err0: return ret; } -static int __exit am35x_remove(struct platform_device *pdev) +static int __devexit am35x_remove(struct platform_device *pdev) { struct am35x_glue *glue = platform_get_drvdata(pdev); @@ -630,7 +630,8 @@ static struct dev_pm_ops am35x_pm_ops = { #endif static struct platform_driver am35x_driver = { - .remove = __exit_p(am35x_remove), + .probe = am35x_probe, + .remove = __devexit_p(am35x_remove), .driver = { .name = "musb-am35x", .pm = DEV_PM_OPS, @@ -643,9 +644,9 @@ MODULE_LICENSE("GPL v2"); static int __init am35x_init(void) { - return platform_driver_probe(&am35x_driver, am35x_probe); + return platform_driver_register(&am35x_driver); } -subsys_initcall(am35x_init); +module_init(am35x_init); static void __exit am35x_exit(void) { diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c index 5e7cfba5b079..261af3487b5e 100644 --- a/drivers/usb/musb/blackfin.c +++ b/drivers/usb/musb/blackfin.c @@ -463,7 +463,7 @@ static const struct musb_platform_ops bfin_ops = { static u64 bfin_dmamask = DMA_BIT_MASK(32); -static int __init bfin_probe(struct platform_device *pdev) +static int __devinit bfin_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -525,7 +525,7 @@ err0: return ret; } -static int __exit bfin_remove(struct platform_device *pdev) +static int __devexit bfin_remove(struct platform_device *pdev) { struct bfin_glue *glue = platform_get_drvdata(pdev); @@ -575,6 +575,7 @@ static struct dev_pm_ops bfin_pm_ops = { #endif static struct platform_driver bfin_driver = { + .probe = bfin_probe, .remove = __exit_p(bfin_remove), .driver = { .name = "musb-blackfin", @@ -588,9 +589,9 @@ MODULE_LICENSE("GPL v2"); static int __init bfin_init(void) { - return platform_driver_probe(&bfin_driver, bfin_probe); + return platform_driver_register(&bfin_driver); } -subsys_initcall(bfin_init); +module_init(bfin_init); static void __exit bfin_exit(void) { diff --git a/drivers/usb/musb/da8xx.c b/drivers/usb/musb/da8xx.c index 2613bfdb09b6..01c8f2ece084 100644 --- a/drivers/usb/musb/da8xx.c +++ b/drivers/usb/musb/da8xx.c @@ -478,7 +478,7 @@ static const struct musb_platform_ops da8xx_ops = { static u64 da8xx_dmamask = DMA_BIT_MASK(32); -static int __init da8xx_probe(struct platform_device *pdev) +static int __devinit da8xx_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -562,7 +562,7 @@ err0: return ret; } -static int __exit da8xx_remove(struct platform_device *pdev) +static int __devexit da8xx_remove(struct platform_device *pdev) { struct da8xx_glue *glue = platform_get_drvdata(pdev); @@ -576,7 +576,8 @@ static int __exit da8xx_remove(struct platform_device *pdev) } static struct platform_driver da8xx_driver = { - .remove = __exit_p(da8xx_remove), + .probe = da8xx_probe, + .remove = __devexit_p(da8xx_remove), .driver = { .name = "musb-da8xx", }, @@ -588,9 +589,9 @@ MODULE_LICENSE("GPL v2"); static int __init da8xx_init(void) { - return platform_driver_probe(&da8xx_driver, da8xx_probe); + return platform_driver_register(&da8xx_driver); } -subsys_initcall(da8xx_init); +module_init(da8xx_init); static void __exit da8xx_exit(void) { diff --git a/drivers/usb/musb/davinci.c b/drivers/usb/musb/davinci.c index f9a3f62a83b5..7802c7ec43f9 100644 --- a/drivers/usb/musb/davinci.c +++ b/drivers/usb/musb/davinci.c @@ -514,7 +514,7 @@ static const struct musb_platform_ops davinci_ops = { static u64 davinci_dmamask = DMA_BIT_MASK(32); -static int __init davinci_probe(struct platform_device *pdev) +static int __devinit davinci_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -597,7 +597,7 @@ err0: return ret; } -static int __exit davinci_remove(struct platform_device *pdev) +static int __devexit davinci_remove(struct platform_device *pdev) { struct davinci_glue *glue = platform_get_drvdata(pdev); @@ -611,7 +611,8 @@ static int __exit davinci_remove(struct platform_device *pdev) } static struct platform_driver davinci_driver = { - .remove = __exit_p(davinci_remove), + .probe = davinci_probe, + .remove = __devexit_p(davinci_remove), .driver = { .name = "musb-davinci", }, @@ -623,9 +624,9 @@ MODULE_LICENSE("GPL v2"); static int __init davinci_init(void) { - return platform_driver_probe(&davinci_driver, davinci_probe); + return platform_driver_register(&davinci_driver); } -subsys_initcall(davinci_init); +module_init(davinci_init); static void __exit davinci_exit(void) { diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 6a929859b55a..d6134b39e8fc 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -1014,12 +1014,12 @@ static void musb_shutdown(struct platform_device *pdev) || defined(CONFIG_USB_MUSB_OMAP2PLUS_MODULE) \ || defined(CONFIG_USB_MUSB_AM35X) \ || defined(CONFIG_USB_MUSB_AM35X_MODULE) -static ushort __initdata fifo_mode = 4; +static ushort __devinitdata fifo_mode = 4; #elif defined(CONFIG_USB_MUSB_UX500) \ || defined(CONFIG_USB_MUSB_UX500_MODULE) -static ushort __initdata fifo_mode = 5; +static ushort __devinitdata fifo_mode = 5; #else -static ushort __initdata fifo_mode = 2; +static ushort __devinitdata fifo_mode = 2; #endif /* "modprobe ... fifo_mode=1" etc */ @@ -1032,7 +1032,7 @@ MODULE_PARM_DESC(fifo_mode, "initial endpoint configuration"); */ /* mode 0 - fits in 2KB */ -static struct musb_fifo_cfg __initdata mode_0_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_0_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, }, @@ -1041,7 +1041,7 @@ static struct musb_fifo_cfg __initdata mode_0_cfg[] = { }; /* mode 1 - fits in 4KB */ -static struct musb_fifo_cfg __initdata mode_1_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_1_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 2, .style = FIFO_RXTX, .maxpacket = 512, .mode = BUF_DOUBLE, }, @@ -1050,7 +1050,7 @@ static struct musb_fifo_cfg __initdata mode_1_cfg[] = { }; /* mode 2 - fits in 4KB */ -static struct musb_fifo_cfg __initdata mode_2_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_2_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, @@ -1060,7 +1060,7 @@ static struct musb_fifo_cfg __initdata mode_2_cfg[] = { }; /* mode 3 - fits in 4KB */ -static struct musb_fifo_cfg __initdata mode_3_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_3_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, .mode = BUF_DOUBLE, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, @@ -1070,7 +1070,7 @@ static struct musb_fifo_cfg __initdata mode_3_cfg[] = { }; /* mode 4 - fits in 16KB */ -static struct musb_fifo_cfg __initdata mode_4_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_4_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, @@ -1101,7 +1101,7 @@ static struct musb_fifo_cfg __initdata mode_4_cfg[] = { }; /* mode 5 - fits in 8KB */ -static struct musb_fifo_cfg __initdata mode_5_cfg[] = { +static struct musb_fifo_cfg __devinitdata mode_5_cfg[] = { { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, @@ -1137,7 +1137,7 @@ static struct musb_fifo_cfg __initdata mode_5_cfg[] = { * * returns negative errno or offset for next fifo. */ -static int __init +static int __devinit fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep, const struct musb_fifo_cfg *cfg, u16 offset) { @@ -1208,11 +1208,11 @@ fifo_setup(struct musb *musb, struct musb_hw_ep *hw_ep, return offset + (maxpacket << ((c_size & MUSB_FIFOSZ_DPB) ? 1 : 0)); } -static struct musb_fifo_cfg __initdata ep0_cfg = { +static struct musb_fifo_cfg __devinitdata ep0_cfg = { .style = FIFO_RXTX, .maxpacket = 64, }; -static int __init ep_config_from_table(struct musb *musb) +static int __devinit ep_config_from_table(struct musb *musb) { const struct musb_fifo_cfg *cfg; unsigned i, n; @@ -1303,7 +1303,7 @@ done: * ep_config_from_hw - when MUSB_C_DYNFIFO_DEF is false * @param musb the controller */ -static int __init ep_config_from_hw(struct musb *musb) +static int __devinit ep_config_from_hw(struct musb *musb) { u8 epnum = 0; struct musb_hw_ep *hw_ep; @@ -1350,7 +1350,7 @@ enum { MUSB_CONTROLLER_MHDRC, MUSB_CONTROLLER_HDRC, }; /* Initialize MUSB (M)HDRC part of the USB hardware subsystem; * configure endpoints, or take their config from silicon */ -static int __init musb_core_init(u16 musb_type, struct musb *musb) +static int __devinit musb_core_init(u16 musb_type, struct musb *musb) { u8 reg; char *type; @@ -1586,7 +1586,7 @@ irqreturn_t musb_interrupt(struct musb *musb) EXPORT_SYMBOL_GPL(musb_interrupt); #ifndef CONFIG_MUSB_PIO_ONLY -static bool __initdata use_dma = 1; +static bool __devinitdata use_dma = 1; /* "modprobe ... use_dma=0" etc */ module_param(use_dma, bool, 0); @@ -1774,7 +1774,7 @@ static void musb_irq_work(struct work_struct *data) * Init support */ -static struct musb *__init +static struct musb *__devinit allocate_instance(struct device *dev, struct musb_hdrc_config *config, void __iomem *mbase) { @@ -1852,7 +1852,7 @@ static void musb_free(struct musb *musb) * @mregs: virtual address of controller registers, * not yet corrected for platform-specific offsets */ -static int __init +static int __devinit musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl) { int status; @@ -2072,7 +2072,7 @@ fail0: static u64 *orig_dma_mask; #endif -static int __init musb_probe(struct platform_device *pdev) +static int __devinit musb_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; int irq = platform_get_irq_byname(pdev, "mc"); @@ -2101,7 +2101,7 @@ static int __init musb_probe(struct platform_device *pdev) return status; } -static int __exit musb_remove(struct platform_device *pdev) +static int __devexit musb_remove(struct platform_device *pdev) { struct musb *musb = dev_to_musb(&pdev->dev); void __iomem *ctrl_base = musb->ctrl_base; @@ -2361,7 +2361,8 @@ static struct platform_driver musb_driver = { .owner = THIS_MODULE, .pm = MUSB_DEV_PM_OPS, }, - .remove = __exit_p(musb_remove), + .probe = musb_probe, + .remove = __devexit_p(musb_remove), .shutdown = musb_shutdown, }; @@ -2377,13 +2378,9 @@ static int __init musb_init(void) ", " "otg (peripheral+host)", musb_driver_name); - return platform_driver_probe(&musb_driver, musb_probe); + return platform_driver_register(&musb_driver); } - -/* make us init after usbcore and i2c (transceivers, regulators, etc) - * and before usb gadget and host-side drivers start to register - */ -fs_initcall(musb_init); +module_init(musb_init); static void __exit musb_cleanup(void) { diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c index 13d9af9bf920..219d0fba584e 100644 --- a/drivers/usb/musb/musb_debugfs.c +++ b/drivers/usb/musb/musb_debugfs.c @@ -235,7 +235,7 @@ static const struct file_operations musb_test_mode_fops = { .release = single_release, }; -int __init musb_init_debugfs(struct musb *musb) +int __devinit musb_init_debugfs(struct musb *musb) { struct dentry *root; struct dentry *file; diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index ac3d2eec20fe..59ab98f08e9e 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -1762,7 +1762,7 @@ static void musb_gadget_release(struct device *dev) } -static void __init +static void __devinit init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in) { struct musb_hw_ep *hw_ep = musb->endpoints + epnum; @@ -1799,7 +1799,7 @@ init_peripheral_ep(struct musb *musb, struct musb_ep *ep, u8 epnum, int is_in) * Initialize the endpoints exposed to peripheral drivers, with backlinks * to the rest of the driver state. */ -static inline void __init musb_g_init_endpoints(struct musb *musb) +static inline void __devinit musb_g_init_endpoints(struct musb *musb) { u8 epnum; struct musb_hw_ep *hw_ep; @@ -1832,7 +1832,7 @@ static inline void __init musb_g_init_endpoints(struct musb *musb) /* called once during driver setup to initialize and link into * the driver model; memory is zeroed. */ -int __init musb_gadget_setup(struct musb *musb) +int __devinit musb_gadget_setup(struct musb *musb) { int status; diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c index c27bbbf32b52..b254173e7e85 100644 --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -408,7 +408,7 @@ static const struct musb_platform_ops omap2430_ops = { static u64 omap2430_dmamask = DMA_BIT_MASK(32); -static int __init omap2430_probe(struct platform_device *pdev) +static int __devinit omap2430_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -471,7 +471,7 @@ err0: return ret; } -static int __exit omap2430_remove(struct platform_device *pdev) +static int __devexit omap2430_remove(struct platform_device *pdev) { struct omap2430_glue *glue = platform_get_drvdata(pdev); @@ -524,7 +524,8 @@ static struct dev_pm_ops omap2430_pm_ops = { #endif static struct platform_driver omap2430_driver = { - .remove = __exit_p(omap2430_remove), + .probe = omap2430_probe, + .remove = __devexit_p(omap2430_remove), .driver = { .name = "musb-omap2430", .pm = DEV_PM_OPS, @@ -537,9 +538,9 @@ MODULE_LICENSE("GPL v2"); static int __init omap2430_init(void) { - return platform_driver_probe(&omap2430_driver, omap2430_probe); + return platform_driver_register(&omap2430_driver); } -subsys_initcall(omap2430_init); +module_init(omap2430_init); static void __exit omap2430_exit(void) { diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c index 1f405616e6cd..b387f12d05b8 100644 --- a/drivers/usb/musb/tusb6010.c +++ b/drivers/usb/musb/tusb6010.c @@ -1165,7 +1165,7 @@ static const struct musb_platform_ops tusb_ops = { static u64 tusb_dmamask = DMA_BIT_MASK(32); -static int __init tusb_probe(struct platform_device *pdev) +static int __devinit tusb_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -1227,7 +1227,7 @@ err0: return ret; } -static int __exit tusb_remove(struct platform_device *pdev) +static int __devexit tusb_remove(struct platform_device *pdev) { struct tusb6010_glue *glue = platform_get_drvdata(pdev); @@ -1239,7 +1239,8 @@ static int __exit tusb_remove(struct platform_device *pdev) } static struct platform_driver tusb_driver = { - .remove = __exit_p(tusb_remove), + .probe = tusb_probe, + .remove = __devexit_p(tusb_remove), .driver = { .name = "musb-tusb", }, @@ -1251,9 +1252,9 @@ MODULE_LICENSE("GPL v2"); static int __init tusb_init(void) { - return platform_driver_probe(&tusb_driver, tusb_probe); + return platform_driver_register(&tusb_driver); } -subsys_initcall(tusb_init); +module_init(tusb_init); static void __exit tusb_exit(void) { diff --git a/drivers/usb/musb/ux500.c b/drivers/usb/musb/ux500.c index f7e04bf34a13..bcfc48f4854a 100644 --- a/drivers/usb/musb/ux500.c +++ b/drivers/usb/musb/ux500.c @@ -58,7 +58,7 @@ static const struct musb_platform_ops ux500_ops = { .exit = ux500_musb_exit, }; -static int __init ux500_probe(struct platform_device *pdev) +static int __devinit ux500_probe(struct platform_device *pdev) { struct musb_hdrc_platform_data *pdata = pdev->dev.platform_data; struct platform_device *musb; @@ -141,7 +141,7 @@ err0: return ret; } -static int __exit ux500_remove(struct platform_device *pdev) +static int __devexit ux500_remove(struct platform_device *pdev) { struct ux500_glue *glue = platform_get_drvdata(pdev); @@ -194,7 +194,8 @@ static const struct dev_pm_ops ux500_pm_ops = { #endif static struct platform_driver ux500_driver = { - .remove = __exit_p(ux500_remove), + .probe = ux500_probe, + .remove = __devexit_p(ux500_remove), .driver = { .name = "musb-ux500", .pm = DEV_PM_OPS, @@ -207,9 +208,9 @@ MODULE_LICENSE("GPL v2"); static int __init ux500_init(void) { - return platform_driver_probe(&ux500_driver, ux500_probe); + return platform_driver_register(&ux500_driver); } -subsys_initcall(ux500_init); +module_init(ux500_init); static void __exit ux500_exit(void) { -- cgit v1.2.2 From 6c2abcdd4f8e21ce686a26697de0ce198a16eaed Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Tue, 31 Jan 2012 14:19:00 +0200 Subject: usb: musb: debugfs: fix error check debugfs will return NULL on failure, so we must check for !ptr instead of IS_ERR(ptr). Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_debugfs.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'drivers') diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c index 219d0fba584e..40a37c91cc10 100644 --- a/drivers/usb/musb/musb_debugfs.c +++ b/drivers/usb/musb/musb_debugfs.c @@ -242,22 +242,22 @@ int __devinit musb_init_debugfs(struct musb *musb) int ret; root = debugfs_create_dir("musb", NULL); - if (IS_ERR(root)) { - ret = PTR_ERR(root); + if (!root) { + ret = -ENOMEM; goto err0; } file = debugfs_create_file("regdump", S_IRUGO, root, musb, &musb_regdump_fops); - if (IS_ERR(file)) { - ret = PTR_ERR(file); + if (!file) { + ret = -ENOMEM; goto err1; } file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root, musb, &musb_test_mode_fops); - if (IS_ERR(file)) { - ret = PTR_ERR(file); + if (!file) { + ret = -ENOMEM; goto err1; } -- cgit v1.2.2 From 39287076e46d2c19aaceaa6f0a44168ae4d257ec Mon Sep 17 00:00:00 2001 From: Supriya Karanth Date: Fri, 17 Feb 2012 14:54:52 +0530 Subject: usb: musb: Reselect index reg in interrupt context musb INDEX register is getting modified/corrupted during temporary un-locking in a SMP system. Set this register with proper value after re-acquiring the lock Scenario: --------- CPU1 is handling a data transfer completion interrupt received for the CLASS1 EP CPU2 is handling a CLASS2 thread which is queuing data to musb for transfer Below is the error sequence: CPU1 | CPU2 -------------------------------------------------------------------- Data transfer completion inter- | rupt recieved. | | musb INDEX reg set to CLASS1 EP | | musb LOCK is acquired. | | | CLASS2 thread queues data. | | CLASS2 thread tries to acquire musb | LOCK but lock is already taken by | CLASS1, so CLASS2 thread is | spinning. | From Interrupt Context musb | giveback function is called | | The giveback function releases | CLASS2 thread now acquires LOCK LOCK | | ClASS1 Request's completion cal-| ClASS2 schedules the data transfer and lback is called | sets the MUSB INDEX to Class2 EP number | Interrupt handler for CLASS1 EP | tries to acquire LOCK and is | spinning | | Interrupt for Class1 EP acquires| Class2 completes the scheduling etc and the MUSB LOCK | releases the musb LOCK | Interrupt for Class1 EP schedul-| es the next data transfer | but musb INDEX register is still| set to CLASS2 EP | Since the MUSB INDEX register is set to a different endpoint, we read and modify the wrong registers. Hence data transfer will not happen properly. This results in unpredictable behavior So, the MUSB INDEX register is set to proper value again when interrupt re-acquires the lock Cc: stable@vger.kernel.org Signed-off-by: Supriya Karanth Signed-off-by: Praveena Nadahally Reviewed-by: srinidhi kasagar Signed-off-by: Felipe Balbi --- drivers/usb/musb/musb_gadget.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'drivers') diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index 59ab98f08e9e..957d9ca3d06d 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -574,6 +574,15 @@ void musb_g_tx(struct musb *musb, u8 epnum) if (request->actual == request->length) { musb_g_giveback(musb_ep, request, 0); + /* + * In the giveback function the MUSB lock is + * released and acquired after sometime. During + * this time period the INDEX register could get + * changed by the gadget_queue function especially + * on SMP systems. Reselect the INDEX to be sure + * we are reading/modifying the right registers + */ + musb_ep_select(mbase, epnum); req = musb_ep->desc ? next_request(musb_ep) : NULL; if (!req) { dev_dbg(musb->controller, "%s idle now\n", @@ -983,6 +992,15 @@ void musb_g_rx(struct musb *musb, u8 epnum) } #endif musb_g_giveback(musb_ep, request, 0); + /* + * In the giveback function the MUSB lock is + * released and acquired after sometime. During + * this time period the INDEX register could get + * changed by the gadget_queue function especially + * on SMP systems. Reselect the INDEX to be sure + * we are reading/modifying the right registers + */ + musb_ep_select(mbase, epnum); req = next_request(musb_ep); if (!req) -- cgit v1.2.2