litmus-rt.git - The LITMUS^RT kernel.

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author	Alan Jenkins <alan-jenkins@tuffmail.co.uk>	2009-07-29 15:07:55 -0400
committer	Rafael J. Wysocki <rjw@sisk.pl>	2009-07-29 15:07:55 -0400
commit	dddac6a7b445de95515f64fdf82fe5dc36c02f26 (patch)
tree	39651610292d6b0c17f210f253a0dd16b022727d /include
parent	ec79be26875f6c1468784876cb99192b7f41c7a5 (diff)

PM / Hibernate: Replace bdget call with simple atomic_inc of i_count

Create bdgrab(). This function copies an existing reference to a block_device. It is safe to call from any context. Hibernation code wishes to copy a reference to the active swap device. Right now it calls bdget() under a spinlock, but this is wrong because bdget() can sleep. It doesn't need a full bdget() because we already hold a reference to active swap devices (and the spinlock protects against swapoff). Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827 Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

Diffstat (limited to 'include')

-rw-r--r--

include/linux/fs.h

1 files changed, 1 insertions, 0 deletions


diff --git a/include/linux/fs.h b/include/linux/fs.h index 0872372184fe..a36ffa5a77a4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h
@@ -1946,6 +1946,7 @@ extern void putname(const char *name);
1946	extern int register_blkdev(unsigned int, const char *);	1946	extern int register_blkdev(unsigned int, const char *);
1947	extern void unregister_blkdev(unsigned int, const char *);	1947	extern void unregister_blkdev(unsigned int, const char *);
1948	extern struct block_device *bdget(dev_t);	1948	extern struct block_device *bdget(dev_t);
		1949	extern struct block_device bdgrab(struct block_device bdev);
1949	extern void bd_set_size(struct block_device *, loff_t size);	1950	extern void bd_set_size(struct block_device *, loff_t size);
1950	extern void bd_forget(struct inode *inode);	1951	extern void bd_forget(struct inode *inode);
1951	extern void bdput(struct block_device *);	1952	extern void bdput(struct block_device *);

/* * HID driver for multitouch panels * * Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr> * Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com> * Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France * * This code is partly based on hid-egalax.c: * * Copyright (c) 2010 Stephane Chatty <chatty@enac.fr> * Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se> * Copyright (c) 2010 Canonical, Ltd. * * This code is partly based on hid-3m-pct.c: * * Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr> * Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se> * Copyright (c) 2010 Canonical, Ltd. * */ /* * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. */ #include <linux/device.h> #include <linux/hid.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/usb.h> #include <linux/input/mt.h> #include "usbhid/usbhid.h" MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>"); MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>"); MODULE_DESCRIPTION("HID multitouch panels"); MODULE_LICENSE("GPL"); #include "hid-ids.h" /* quirks to control the device */ #define MT_QUIRK_NOT_SEEN_MEANS_UP (1 << 0) #define MT_QUIRK_SLOT_IS_CONTACTID (1 << 1) #define MT_QUIRK_CYPRESS (1 << 2) #define MT_QUIRK_SLOT_IS_CONTACTNUMBER (1 << 3) #define MT_QUIRK_ALWAYS_VALID (1 << 4) #define MT_QUIRK_VALID_IS_INRANGE (1 << 5) #define MT_QUIRK_VALID_IS_CONFIDENCE (1 << 6) #define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE (1 << 8) #define MT_QUIRK_NO_AREA (1 << 9) #define MT_QUIRK_IGNORE_DUPLICATES (1 << 10) #define MT_QUIRK_HOVERING (1 << 11) struct mt_slot { __s32 x, y, cx, cy, p, w, h; __s32 contactid; /* the device ContactID assigned to this slot */ bool touch_state; /* is the touch valid? */ bool inrange_state; /* is the finger in proximity of the sensor? */ }; struct mt_class { __s32 name; /* MT_CLS */ __s32 quirks; __s32 sn_move; /* Signal/noise ratio for move events */ __s32 sn_width; /* Signal/noise ratio for width events */ __s32 sn_height; /* Signal/noise ratio for height events */ __s32 sn_pressure; /* Signal/noise ratio for pressure events */ __u8 maxcontacts; bool is_indirect; /* true for touchpads */ }; struct mt_fields { unsigned usages[HID_MAX_FIELDS]; unsigned int length; }; struct mt_device { struct mt_slot curdata; /* placeholder of incoming data */ struct mt_class mtclass; /* our mt device class */ struct mt_fields *fields; /* temporary placeholder for storing the multitouch fields */ unsigned last_field_index; /* last field index of the report */ unsigned last_slot_field; /* the last field of a slot */ __s8 inputmode; /* InputMode HID feature, -1 if non-existent */ __s8 inputmode_index; /* InputMode HID feature index in the report */ __s8 maxcontact_report_id; /* Maximum Contact Number HID feature, -1 if non-existent */ __u8 num_received; /* how many contacts we received */ __u8 num_expected; /* expected last contact index */ __u8 maxcontacts; __u8 touches_by_report; /* how many touches are present in one report: * 1 means we should use a serial protocol * > 1 means hybrid (multitouch) protocol */ bool serial_maybe; /* need to check for serial protocol */ bool curvalid; /* is the current contact valid? */ unsigned mt_flags; /* flags to pass to input-mt */ }; /* classes of device behavior */ #define MT_CLS_DEFAULT 0x0001 #define MT_CLS_SERIAL 0x0002 #define MT_CLS_CONFIDENCE 0x0003 #define MT_CLS_CONFIDENCE_CONTACT_ID 0x0004 #define MT_CLS_CONFIDENCE_MINUS_ONE 0x0005 #define MT_CLS_DUAL_INRANGE_CONTACTID 0x0006 #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER 0x0007 #define MT_CLS_DUAL_NSMU_CONTACTID 0x0008 #define MT_CLS_INRANGE_CONTACTNUMBER 0x0009 /* vendor specific classes */ #define MT_CLS_3M 0x0101 #define MT_CLS_CYPRESS 0x0102 #define MT_CLS_EGALAX 0x0103 #define MT_CLS_EGALAX_SERIAL 0x0104 #define MT_CLS_TOPSEED 0x0105 #define MT_CLS_PANASONIC 0x0106 #define MT_CLS_FLATFROG 0x0107 #define MT_CLS_GENERALTOUCH_TWOFINGERS 0x0108 #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS 0x0109 #define MT_DEFAULT_MAXCONTACT 10 #define MT_MAX_MAXCONTACT 250 #define MT_USB_DEVICE(v, p) HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p) #define MT_BT_DEVICE(v, p) HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p) /* * these device-dependent functions determine what slot corresponds * to a valid contact that was just read. */ static int cypress_compute_slot(struct mt_device *td) { if (td->curdata.contactid != 0 || td->num_received == 0) return td->curdata.contactid; else return -1; } static struct mt_class mt_classes[] = { { .name = MT_CLS_DEFAULT, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP }, { .name = MT_CLS_SERIAL, .quirks = MT_QUIRK_ALWAYS_VALID}, { .name = MT_CLS_CONFIDENCE, .quirks = MT_QUIRK_VALID_IS_CONFIDENCE }, { .name = MT_CLS_CONFIDENCE_CONTACT_ID, .quirks = MT_QUIRK_VALID_IS_CONFIDENCE | MT_QUIRK_SLOT_IS_CONTACTID }, { .name = MT_CLS_CONFIDENCE_MINUS_ONE, .quirks = MT_QUIRK_VALID_IS_CONFIDENCE | MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE }, { .name = MT_CLS_DUAL_INRANGE_CONTACTID, .quirks = MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTID, .maxcontacts = 2 }, { .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER, .quirks = MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTNUMBER, .maxcontacts = 2 }, { .name = MT_CLS_DUAL_NSMU_CONTACTID, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_SLOT_IS_CONTACTID, .maxcontacts = 2 }, { .name = MT_CLS_INRANGE_CONTACTNUMBER, .quirks = MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTNUMBER }, /* * vendor specific classes */ { .name = MT_CLS_3M, .quirks = MT_QUIRK_VALID_IS_CONFIDENCE | MT_QUIRK_SLOT_IS_CONTACTID, .sn_move = 2048, .sn_width = 128, .sn_height = 128, .maxcontacts = 60, }, { .name = MT_CLS_CYPRESS, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_CYPRESS, .maxcontacts = 10 }, { .name = MT_CLS_EGALAX, .quirks = MT_QUIRK_SLOT_IS_CONTACTID | MT_QUIRK_VALID_IS_INRANGE, .sn_move = 4096, .sn_pressure = 32, }, { .name = MT_CLS_EGALAX_SERIAL, .quirks = MT_QUIRK_SLOT_IS_CONTACTID | MT_QUIRK_ALWAYS_VALID, .sn_move = 4096, .sn_pressure = 32, }, { .name = MT_CLS_TOPSEED, .quirks = MT_QUIRK_ALWAYS_VALID, .is_indirect = true, .maxcontacts = 2, }, { .name = MT_CLS_PANASONIC, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP, .maxcontacts = 4 }, { .name = MT_CLS_GENERALTOUCH_TWOFINGERS, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_VALID_IS_INRANGE | MT_QUIRK_SLOT_IS_CONTACTNUMBER, .maxcontacts = 2 }, { .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_SLOT_IS_CONTACTNUMBER }, { .name = MT_CLS_FLATFROG, .quirks = MT_QUIRK_NOT_SEEN_MEANS_UP | MT_QUIRK_NO_AREA, .sn_move = 2048, .maxcontacts = 40, }, { } }; static ssize_t mt_show_quirks(struct device *dev, struct device_attribute *attr, char *buf) { struct hid_device *hdev = container_of(dev, struct hid_device, dev); struct mt_device *td = hid_get_drvdata(hdev); return sprintf(buf, "%u\n", td->mtclass.quirks); } static ssize_t mt_set_quirks(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct hid_device *hdev = container_of(dev, struct hid_device, dev); struct mt_device *td = hid_get_drvdata(hdev); unsigned long val; if (kstrtoul(buf, 0, &val)) return -EINVAL; td->mtclass.quirks = val; return count; } static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks); static struct attribute *sysfs_attrs[] = { &dev_attr_quirks.attr, NULL }; static struct attribute_group mt_attribute_group = { .attrs = sysfs_attrs }; static void mt_feature_mapping(struct hid_device *hdev, struct hid_field *field, struct hid_usage *usage) { struct mt_device *td = hid_get_drvdata(hdev); int i; switch (usage->hid) { case HID_DG_INPUTMODE: td->inputmode = field->report->id; td->inputmode_index = 0; /* has to be updated below */ for (i=0; i < field->maxusage; i++) { if (field->usage[i].hid == usage->hid) { td->inputmode_index = i; break; } } break; case HID_DG_CONTACTMAX: td->maxcontact_report_id = field->report->id; td->maxcontacts = field->value[0]; if (!td->maxcontacts && field->logical_maximum <= MT_MAX_MAXCONTACT) td->maxcontacts = field->logical_maximum; if (td->mtclass.maxcontacts) /* check if the maxcontacts is given by the class */ td->maxcontacts = td->mtclass.maxcontacts; break; case 0xff0000c5: if (field->report_count == 256 && field->report_size == 8) { /* Win 8 devices need special quirks */ __s32 *quirks = &td->mtclass.quirks; *quirks |= MT_QUIRK_ALWAYS_VALID; *quirks |= MT_QUIRK_IGNORE_DUPLICATES; *quirks |= MT_QUIRK_HOVERING; *quirks &= ~MT_QUIRK_NOT_SEEN_MEANS_UP; *quirks &= ~MT_QUIRK_VALID_IS_INRANGE; *quirks &= ~MT_QUIRK_VALID_IS_CONFIDENCE; } break; } } static void set_abs(struct input_dev *input, unsigned int code, struct hid_field *field, int snratio) { int fmin = field->logical_minimum; int fmax = field->logical_maximum; int fuzz = snratio ? (fmax - fmin) / snratio : 0; input_set_abs_params(input, code, fmin, fmax, fuzz, 0); input_abs_set_res(input, code, hidinput_calc_abs_res(field, code)); } static void mt_store_field(struct hid_usage *usage, struct mt_device *td, struct hid_input *hi) { struct mt_fields *f = td->fields; if (f->length >= HID_MAX_FIELDS) return; f->usages[f->length++] = usage->hid; } static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi, struct hid_field *field, struct hid_usage *usage, unsigned long **bit, int *max) { struct mt_device *td = hid_get_drvdata(hdev); struct mt_class *cls = &td->mtclass; int code; struct hid_usage *prev_usage = NULL; /* Only map fields from TouchScreen or TouchPad collections. * We need to ignore fields that belong to other collections * such as Mouse that might have the same GenericDesktop usages. */ if (field->application == HID_DG_TOUCHSCREEN) td->mt_flags |= INPUT_MT_DIRECT; else if (field->application != HID_DG_TOUCHPAD) return 0; /* * Model touchscreens providing buttons as touchpads. */ if (field->application == HID_DG_TOUCHPAD || (usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) td->mt_flags |= INPUT_MT_POINTER; /* eGalax devices provide a Digitizer.Stylus input which overrides * the correct Digitizers.Finger X/Y ranges. * Let's just ignore this input. */ if (field->physical == HID_DG_STYLUS) return -1; if (usage->usage_index) prev_usage = &field->usage[usage->usage_index - 1]; switch (usage->hid & HID_USAGE_PAGE) { case HID_UP_GENDESK: switch (usage->hid) { case HID_GD_X: if (prev_usage && (prev_usage->hid == usage->hid)) { hid_map_usage(hi, usage, bit, max, EV_ABS, ABS_MT_TOOL_X); set_abs(hi->input, ABS_MT_TOOL_X, field, cls->sn_move); } else { hid_map_usage(hi, usage, bit, max,


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