- 12 Nov, 2013 21 commits
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Ian Abbott authored
The `comedi_dev_from_minor()` function is no longer used, so remove it. Calls to it have either been replaced by calls to `comedi_dev_get_from_minor()` or by using the `private_data` member of the open file object. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Since the `struct comedi_device` should now be protected from being freed while an open file object is using it, use the `private_data` member of the `struct file` to point to it. Set it in `comedi_open()` and use it in the other file operation handlers instead of calling `comedi_dev_from_minor()` and checking the result. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The functions in "kcomedilib" need to prevent the comedi device being detached during their operation. This can be done by acquiring either the main mutex or the "attach lock" semaphore in the `struct comedi_device`. Use the attach lock when merely checking whether the device is attached. Use the mutex when processing a comedi instruction. Also, don't bother trying to manipulate the module use count of low-level comedi driver in `comedi_open()` and `comedi_close()`. If the device gets detached while it is "open", we wouldn't be able to decrement the module use count anyway. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Low-level comedi drivers that use the "kcomedilib" module (currently only the "comedi_bond" driver) call `comedi_open()` to "open" another comedi device (not as a file) and `comedi_close()` to "close" it. (Note: these are the functions exported by the "kcomedilib" module, not the identically named, statically linked functions in the core "comedi" module.) In `comedi_open()`, call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` to get the pointer to the `struct comedi_device` being "opened". This increments its reference count to prevent it being freed. Call `comedi_dev_put()` if `comedi_open()` returns `NULL`, and also call it from `comedi_close()`. This decrements the reference count. Note that although we now protect against the `struct comedi_device` being freed, we do not yet protect against it being "detached" while it is being used. This will be addressed by a later patch. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` in the sysfs attribute handler functions to increment the reference of the `struct comedi_device` during the operation. Call `comedi_dev_put()` to decrement the reference afterwards. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
In the seq_file 'show' handler for "/proc/comedi" - `comedi_read()` in "comedi/proc.c", call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` to increment the reference counter for the `struct comedi_device` while it is being examined. Call `comedi_dev_put()` to decrement the reference afterwards. Also acquire the `attach_lock` rwsem while checking whether the device is attached. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Change `comedi_driver_unregister()` to call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` when finding devices using the driver. This increments the reference count to prevent the device being removed while it is being checked to see if it is attached to the driver. Call `comedi_dev_put()` to decrement the reference afterwards. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
In the 'open' file operation handler `comedi_open()` in "comedi_fops.c", call `comedi_dev_get_from_minor()` instead of `comedi_dev_from_minor()` to get the pointer to the `struct comedi_device`. This increments the reference to prevent it being freed. Call `comedi_dev_put()` to decrement the reference on failure, and also call it from the 'release' file operation handler `comedi_close()`. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Add function `struct comedi_device *comedi_dev_get_from_minor(unsigned minor)`. This behaves like the existing `comedi_dev_from_minor()` except that it also increments the `struct kref refcount` member (via new helper function `comedi_dev_get()`) to prevent it being freed. If it returns a valid pointer, the caller is responsible for calling `comedi_dev_put()` to decrement the reference count. Export `comedi_dev_get_from_minor()` and `comedi_dev_put()` as they will be used by the "kcomedilib" module in addition to the "comedi" module itself. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Add a `struct kref refcount` member to `struct comedi_device` to allow safe destruction of the comedi device. Only free the comedi device via the 'release' callback `kref_put()`. Currently, nothing calls `kref_put()`, so the safe destruction is ineffective, but this will be addressed by later patches. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The 'read' file operation for comedi devices does not use the main mutex in the `struct comedi_device` to avoid contention with some ioctls that may take a while to complete. Use the `attach_lock` semaphore to protect against detachment while the 'read' operation is in progress. This is a `struct rw_semaphore` and we read-lock it to protect against device detachment. Note that `comedi_device_cancel_all()` is called during device detachment, which cancels any ongoing asynchronous commands. This will wake up any blocked readers which will then release the `attach_lock` semaphore and complete the 'read' operation early. The only time the 'read' file operation does use the main mutex is at the end of the command when it has to call `do_become_nonbusy()` to mark the subdevice as no longer busy handling an asynchronous command. To avoid deadlock, it has to remove the task from the wait queue and release the `attach_lock` semaphore before acquiring the main mutex. It then needs to confirm the device is still attached. Unfortunately, we do not yet protect against a dynamically allocated `struct comedi_device` being deleted during the operation. This will be addressed by a later patch. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The 'write' file operation for comedi devices does not use the main mutex in the `struct comedi_device` to avoid contention with some ioctls that may take a while to complete. Use the `attach_lock` semaphore to protect against detachment while the 'write' operation is in progress. This is a `struct rw_semaphore` and we read-lock it to protect against device detachment. Note that `comedi_device_cancel_all()` is called during device detachment, which cancels any ongoing asynchronous commands. This will wake up any blocked writers which will then release the `attach_lock` semaphore and complete the 'write' operation early. The only time the 'write' file operation does use the main mutex is at the end of the command when it has to call `do_become_nonbusy()` to mark the subdevice as no longer busy handling an asynchronous command. To avoid deadlock, it has to remove the task from the wait queue and release the `attach_lock` semaphore before acquiring the main mutex. It then needs to confirm that the device is still attached. Unfortunately, we do not yet protect against a dynamically allocated `struct comedi_device` being deleted during the operation. This will be addressed by a later patch. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Add a member `detach_count` to `struct comedi_device` that is incremented every time the device gets detached. This will be used in some validity checks in the 'read' and 'write' file operations to make sure the attachment remains valid. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The comedi core module's handling of the `COMEDI_DEVCONFIG` ioctl will not allow a device to be detached if it is busy. However, comedi devices can also be auto-detached due to a removal of a hardware device. One of the things we should do in that case is cancel any asynchronous commands that are running. Add a new function `comedi_device_cancel_all()` to do that and call it from `comedi_device_detach()`. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Wake up all waiters on the comedi subdevice's async wait queue whenever the subdevice is marked "non-busy". This happens when an asynchronous command is cancelled or when a command is terminated and all data has been read or written. Note: use `wake_up_interruptible_all()` as we only use interruptible waits. Remove the call to `wake_up_interruptible()` from `do_cancel_ioctl()` as it will call `wake_up_interruptible_all()` indirectly via `do_cancel()` and `do_become_nonbusy()`. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Rename the local function `cleanup_device()` to `comedi_device_detach_cleanup()`. It is only called from the `comedi_device_detach()` function and that is called from `comedi_device_cleanup()` and other places. The more specific function name seems less confusing. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Acquire the `attach_lock` semaphore in the `struct comedi_device` while modifying the `attached` flag. This is a "write" acquire. Note that the main mutex in the `struct comedi_device` is also held at this time. Tasks wishing to check the device is attached will need to either acquire the main mutex, or "read" acquire the `attach_lock` semaphore, or both in that order. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The 'read' and 'write' file operations on comedi devices do not use the main mutex in the `struct comedi_device` to avoid contention with ioctls that may take a while to complete. However, it is necessary to protect against the device being detached while the operation is in progress. Add member `struct rw_semaphore attach_lock` to `struct comedi_device` for this purpose and initialize it on creation. The actual locking and unlocking will be implemented by subsequent patches. Tasks that are attaching or detaching comedi devices will write-acquire the new semaphore whilst also holding the main mutex in the `struct comedi_device`. Tasks that wish to protect against the comedi device being detached need to acquire either the main mutex, or read-acquire the new semaphore, or both in that order. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
Two structures defined in "comedidev.h" have an element of type `spinlock_t`, so add `#include <linux/spinlock_types.h>` to declare it. One structure has an element of type `struct mutex` so add `#include <linux/mutex.h>` to declare it. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ian Abbott authored
The 'kcomedilib' module used to provide functions to allow asynchronous comedi commands to be set up from another kernel module, but now commands can only be set up by ioctls from user space via the core comedi module. Since support for commands initiated from kernel space has been dropped, the `cb_func` and `cb_arg` members of `struct comedi_async` are never set (although the `cb_mask` member is still used to mask comedi events). The `SRF_USER` bit of the comedi subdevice runflags is no longer needed to distinguish commands from user and kernel space since they only come from user space. Don't bother setting or testing the `SRF_USER` flag, and get rid of it, along with the `cb_func` and `cb_arg` members. Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Dulshani Gunawardhana authored
Fix the following sparse warning: drivers/staging/lustre/lustre/llite/llite_internal.h:461:49: error:dubious one-bit signed bitfield Signed-off-by: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 11 Nov, 2013 16 commits
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Dulshani Gunawardhana authored
Fix the following sparse warnings generated by AND-ing FMODE_* constant with a normal integer. drivers/staging/lustre/lustre/llite/file.c:102:32: warning: restricted fmode_t degrades to integer Signed-off-by: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Dulshani Gunawardhana authored
Fix the following sparse warings in local_storage.c. drivers/staging/lustre/lustre/obdclass/local_storage.c:269:16:warning:incorrect type in assignment (different base types) Signed-off-by: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch removes an extra newline character in pmgr/dmm.c. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Suggested-by: Greg KH <gregkh@linuxfoundation.org> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch removes confusing macro gdm_lte_sdu_send as stated in TODO list in file gdm_lte.c. It then fixes the place where the macro is used. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
The function dgrp_receive() in dgrp_net_ops.c is too long and can be refactored. It uses various switch statements and goto labels. I have removed a label called data and tried to extract a new function out of it called as handle_data_in_packet(). This helps to make the code more modularize and simple to read and understand. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Matina Maria Trompouki authored
This patch removes the following warning reported by checkpatch.pl WARNING: line over 80 characters drivers/staging/media/lirc/lirc_imon.c Signed-off-by: Matina Maria Trompouki <mtrompou@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Matina Maria Trompouki authored
This patch removes the following warning reported by checkpatch.pl WARNING: quoted string split across lines drivers/staging/media/lirc/lirc_igorplugusb.c drivers/staging/media/lirc/lirc_imon.c drivers/staging/media/lirc/lirc_serial.c drivers/staging/media/lirc/lirc_zilog.c Signed-off-by: Matina Maria Trompouki <mtrompou@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Matina Maria Trompouki authored
This patch removes the following warning reported by checkpatch.pl WARNING: space prohibited before semicolon drivers/staging/ozwpan/ozproto.c Signed-off-by: Matina Maria Trompouki <mtrompou@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Teodora Baluta authored
This patch fixes all bool tests by deleting the comparison. Most of these were detected using coccinelle and silence the following type of coccinelle warnings for drivers/staging/vt6655/bssdb.c file: WARNING: Comparison to bool Signed-off-by: Teodora Baluta <teobaluta@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Teodora Baluta authored
This patch silences the following type of warnings: WARNING: unnecessary whitespace before a quoted newline Signed-off-by: Teodora Baluta <teobaluta@gmail.com> Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Teodora Baluta authored
Checkpatch.pl gave the following warnings WARNING: printk() should include KERN_ facility level After fixing these with KERN_INFO facility level, it was suggested to use netdev_ instead of printk() with KERN_INFO facility. Used netdev_dbg for the statements inside of PLICE_DEBUG #ifdef, as debugging shouldn't rely on compile options and netdev_info for one printk which wasn't inside any #ifdef PLICE_DEBUG. Signed-off-by: Teodora Baluta <teobaluta@gmail.com> Reviewed-by: Lisa Nguyen <lisa@xenapiadmin.com> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch moves the declaration of variable IsXDCompliance to file smilsub.c since this is the only file which uses it. Hence, it also removes extern declaration from the header file smil.h and unnecessary declaration in smilmain.c Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch moves the declaration of variable IsSSFDCCompliance to file smilsub.c since this is the only file which uses it. Hence, it also removes extern declaration from the header file smil.h and unnecessary declaration in smilmain.c Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch moves the declaration of variable ErrCode to file smilmain.c since this is the only file which uses it. Hence, it also removes extern declaration from the header file smil.h. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch moves the declaration of variable ErrXDCode to file smilsub.c since this is the only file which uses it. Hence, it also removes extern declaration from the header file smil.h and unnecessary declaration in smilmain.c Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Ebru Akagunduz authored
This patch fixes the Sparse Warnings "symbol was not declared. Should it be static?" so it removes some extern expressions to r8180.h and it defines some extern expressions in ieee80211.h Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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- 10 Nov, 2013 3 commits
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Himangi Saraogi authored
This patch fixes sparse warnings "Using plain integer as NULL pointer" in sta_h25.c Signed-off-by: Himangi Saraogi <himangi774@gmail.com> Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
As suggested in TODO list, this patch uses ALIGN() macro for variable dummy_cnt in functions up_to_host() and gdm_mux_send() in file gdm_mux.c. The macro has already been defined in include/linux/kernel.h, hence is not defined again. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Rashika Kheria authored
This patch removes confusing macro gdm_lte_hci_send as stated in TODO list in file gdm_lte.c. It then fixes the place where the macro is used. Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com> Reviewed-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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