/* * IrNET protocol module : Synchronous PPP over an IrDA socket. * * Jean II - HPL `00 - * * This file contains all definitions and declarations necessary for the * PPP part of the IrNET module. * This file is a private header, so other modules don't want to know * what's in there... */ #ifndef IRNET_PPP_H #define IRNET_PPP_H /***************************** INCLUDES *****************************/ #include "irnet.h" /* Module global include */ #include /************************ CONSTANTS & MACROS ************************/ /* IrNET control channel stuff */ #define IRNET_MAX_COMMAND 256 /* Max length of a command line */ /* PPP hardcore stuff */ /* Bits in rbits (PPP flags in irnet struct) */ #define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP) /* Bit numbers in busy */ #define XMIT_BUSY 0 #define RECV_BUSY 1 #define XMIT_WAKEUP 2 #define XMIT_FULL 3 /* Queue management */ #define PPPSYNC_MAX_RQLEN 32 /* arbitrary */ /****************************** TYPES ******************************/ /**************************** PROTOTYPES ****************************/ /* ----------------------- CONTROL CHANNEL ----------------------- */ static inline ssize_t irnet_ctrl_write(irnet_socket *, const char *, size_t); static inline ssize_t irnet_ctrl_read(irnet_socket *, struct file *, char *, size_t); static inline unsigned int irnet_ctrl_poll(irnet_socket *, struct file *, poll_table *); /* ----------------------- CHARACTER DEVICE ----------------------- */ static int dev_irnet_open(struct inode *, /* fs callback : open */ struct file *), dev_irnet_close(struct inode *, struct file *); static ssize_t dev_irnet_write(struct file *, const char __user *, size_t, loff_t *), dev_irnet_read(struct file *, char __user *, size_t, loff_t *); static unsigned int dev_irnet_poll(struct file *, poll_table *); static long dev_irnet_ioctl(struct file *, unsigned int, unsigned long); /* ------------------------ PPP INTERFACE ------------------------ */ static inline struct sk_buff * irnet_prepare_skb(irnet_socket *, struct sk_buff *); static int ppp_irnet_send(struct ppp_channel *, struct sk_buff *); static int ppp_irnet_ioctl(struct ppp_channel *, unsigned int, unsigned long); /**************************** VARIABLES ****************************/ /* Filesystem callbacks (to call us) */ static const struct file_operations irnet_device_fops = { .owner = THIS_MODULE, .read = dev_irnet_read, .write = dev_irnet_write, .poll = dev_irnet_poll, .unlocked_ioctl = dev_irnet_ioctl, .open = dev_irnet_open, .release = dev_irnet_close, .llseek = noop_llseek, /* Also : llseek, readdir, mmap, flush, fsync, fasync, lock, readv, writev */ }; /* Structure so that the misc major (drivers/char/misc.c) take care of us... */ static struct miscdevice irnet_misc_device = { .minor = IRNET_MINOR, .name = "irnet", .fops = &irnet_device_fops }; #endif /* IRNET_PPP_H */ cfeb0cc9ef03d885182ce8b'>testing/selftests/x86/Makefile
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authorTony Lindgren <tony@atomide.com>2017-01-19 08:49:07 -0800
committerVinod Koul <vinod.koul@intel.com>2017-01-25 11:29:11 +0530
commitae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b (patch)
tree139fc7e29f97d6bb6c4dca2a97be2dc3f824bd51 /tools/testing/selftests/x86/Makefile
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
dmaengine: cppi41: Fix runtime PM timeouts with USB mass storage
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") added runtime PM support for cppi41, but had corner case issues. Some of the issues were fixed with commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected"). That fix however caused a new regression where we can get error -115 messages with USB on BeagleBone when connecting a USB mass storage device to a hub. This is because when connecting a USB mass storage device to a hub, the initial DMA transfers can take over 200ms to complete and cppi41 autosuspend delay times out. To fix the issue, we want to implement refcounting for chan_busy array that contains the active dma transfers. Increasing the autosuspend delay won't help as that the delay could be potentially seconds, and it's best to let the USB subsystem to deal with the timeouts on errors. The earlier attempt for runtime PM was buggy as the pm_runtime_get/put() calls could get unpaired easily as they did not follow the state of the chan_busy array as described in commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected". Let's fix the issue by adding pm_runtime_get() to where a new transfer is added to the chan_busy array, and calls to pm_runtime_put() where chan_busy array entry is cleared. This prevents any autosuspend timeouts from happening while dma transfers are active. Fixes: 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected") Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Bin Liu <b-liu@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Patrick Titiano <ptitiano@baylibre.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Bin Liu <b-liu@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'tools/testing/selftests/x86/Makefile')