- 06 Sep, 2010 2 commits
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Bernie Thompson authored
Fix warnings detected by tools Signed-off-by:
Bernie Thompson <bernie@plugable.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@suse.de>
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Bernie Thompson authored
Fix fb_defio bug in udlfb for multiple framebuffers Previously when using fb_defio with multiple DisplayLink attached displays udlfb incorrectly used a shared datastructure where it needed to have one per fb_info struct. This was completely broken and caused all kinds of problems, including rendering to one framebuffer affecting others. Signed-off-by:
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- 05 Sep, 2010 38 commits
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Michael Prokop authored
The Kconfig description for CONFIG_SBE_PMCC4_NCOMM says: If you have purchased this optional support you must say Y or M here to allow the driver to operate with the NCOMM product. This is not correct as it can not be built as module, this patch updates the description accordingly. Signed-off-by:
Michael Prokop <mika@grml.org> Signed-off-by:
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Julia Lawall authored
In each case, the function has an unsigned return type, but returns a negative constant to indicate an error condition. For move_block_from_dma, there is only one call and the return value is dropped, so it need not be unsigned. For labpc_eeprom_write, there is only one call and the result is stored in a signed variable, so again the unsigned return type is not necessary. A sematic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @exists@ identifier f; constant C; @@ unsigned f(...) { <+... * return -C; ...+> } // </smpl> Signed-off-by:
Julia Lawall <julia@diku.dk> Signed-off-by:
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Vasiliy Kulikov authored
kmalloc() may fail, check for it. Allocated memory is not freed. Use IS_ERR() instead of strict checking. Signed-off-by:
Vasiliy Kulikov <segooon@gmail.com> Cc: David Cross <david.cross@cypress.com> Signed-off-by:
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Vasiliy Kulikov authored
Function get_user may fail. Check for it. Signed-off-by:
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Vasiliy Kulikov authored
Function put_user may fail. Check for it. Signed-off-by:
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Vasiliy Kulikov authored
Function get_user may fail. Check for it. Signed-off-by:
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Vasiliy Kulikov authored
Functions alloc_ieee80211 and register_netdev may fail. Check for it. Signed-off-by:
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Vasiliy Kulikov authored
Function kzalloc may fail. Check for it. Signed-off-by:
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Bernie Thompson authored
Add module options for console and fb_defio Convert fb_defio on/off switch to module option and add console option. >From the command line, pass options to modprobe modprobe udlfb defio=1 console=1 Or for permanent option, create file like /etc/modprobe.d/options with text options udlfb defio=1 console=1 Accepted options: fb_defio Make use of the fb_defio (CONFIG_FB_DEFERRED_IO) kernel module to track changed areas of the framebuffer by page faults. Standard fbdev applications that use mmap but that do not report damage, may be able to work with this enabled. Disabled by default because of overhead and other issues. console Allow fbcon to attach to udlfb provided framebuffers. This is disabled by default because fbcon will aggressively consume the first framebuffer it finds, which isn't usually what the user wants in the case of USB displays. Signed-off-by: -
Bernie Thompson authored
Support writing default/backup edid via /sys/class/graphics/fb?/edid Writing a backup edid blob to the 'edid' file will cause udlfb to attempt to re-read the edid from hardware. If we still don't have a good edid, it will use the backup edid instead. The intent is to 1) enable user-supplied edid 2) enable udev rules to backup the last known good edid for a device, and then provide that edid as a backup for all future starts Signed-off-by:
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Bernie Thompson authored
Fix big endian rendering bug (affects PowerPC) Thanks to Christian Melki at Ericsson for finding and suggesting patch. Signed-off-by:
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Bernie Thompson authored
Enhance EDID and mode table handling * Adds support for lower-end DL chips on higher-end monitors * Adds support for using fbdev standard EDID parsing and handling * Adds support for more dynamic reallocation of framebuffer, based on new EDID Queries EDID from hardware with several retries then queries DisplayLink chip for max pixel area via vendor descriptor. Uses existing fbdev mode handling service funcations to build mode list of common modes between adapter and monitor. This enables lower-end chips (e.g. DL-125) to successfully pick a compatible mode on higher end monitors (e.g. whose default mode is over 1280x1024). Reallocate framebuffer if necessary in response to new max mode. Signed-off-by:
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Bernie Thompson authored
Revamp reference handling and synchronization for unload/shutdown Udlfb is a "virtual" framebuffer device that really exists on two separate stacks: at the bottom of the framebuffer interface, and on top of USB. During unload, there's no guarantee which one will tear down first. So reference counting must be solid to handle all possibilities and not access anything once its gone. Signed-off-by:
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Bernie Thompson authored
Remove metrics_misc sysfs attribute Previously returned multiple values, which goes against sysfs guidelines. Had been used for debugging to figure out which of the multiple fbdev interfaces an app was using, but log file messages are sufficient. Signed-off-by:
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Bernie Thompson authored
Add ability to power off monitor with standard blanking interface Used by X servers and others to manage power of dislpay Signed-off-by:
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Bernie Thompson authored
Restore fbdev character read and write support Enables access to the framebuffer from simple reads and writes to /dev/fb0 (or fb1, ...). Low performance, because of extra copy and because udlfb must scan every pixel for changes. But very useful for testing and simple image display, etc. Signed-off-by:
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Bernie Thompson authored
Add documentation for the udlfb framebuffer driver for DisplayLink devices. Signed-off-by:
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Joe Perches authored
Signed-off-by:
Joe Perches <joe@perches.com> Signed-off-by:
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Javier Martinez Canillas authored
Signed-off-by:
Javier Martinez Canillas <martinez.javier@gmail.com> Signed-off-by:
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Sven Eckelmann authored
We must reduce our own mtu when we reduce the mtu of any device we use to transfer our packets. Otherwise we may accept to large packets which gets dropped by the actual device. Reported-by:
Sven Eckelmann <sven.eckelmann@gmx.de> Signed-off-by:
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Sven Eckelmann authored
Information about dropped packets are usually only interesting for debugging purposes and otherwise open the possibility to flood the logs of the target machine with useless information. pr_debug will not output those information on a nodebug kernel. Reported-by:
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Sven Eckelmann authored
batman_if has the name of the net_dev as extra string in its own structure, but also holds a reference to the actual net_device structure which always has the current name of the device. This makes it unneccessary and also more complex because we must update the name in situations when we receive a NETDEV_CHANGENAME event. Signed-off-by:
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Marek Lindner authored
This patch removes all remaining global variables and includes the necessary bits into the bat_priv structure. It is the last remaining piece to allow multiple concurrent mesh clouds on the same device. A few global variables have been rendered obsolete during the process and have been removed entirely. Signed-off-by:
Marek Lindner <lindner_marek@yahoo.de> [sven.eckelmann@gmx.de: Rework on top of current version] Signed-off-by:
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Marek Lindner authored
This patch replaces the static bat0 interface with a dynamic/abstracted approach. It is now possible to create multiple batX interfaces by assigning hard interfaces to them. Each batX interface acts as an independent mesh network. A soft interface is removed once no hard interface references it any longer. Signed-off-by:
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Sven Eckelmann authored
We must ensure that all interesting data is linear and not paged out to access all information in a header or a full batman-adv related packet. Otherwise we may drop packets which have non-linear headers but which hold valid data. This doesn't affect non-linear skbs which have all headers in a linear head unless we must process the whole packet like in ogms or vis packets. Signed-off-by:
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Sven Eckelmann authored
We can use skb_cow instead of a handwritten function to test and create a writable skb buffer. This also allows us to pre-allocate headroom to be able to send the data without re-allocating the buffer again to add the ethernet header. Signed-off-by:
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Sven Eckelmann authored
The vis information structure is used in a way that it can be transfered directly as packet. It still had to be copied into a skb because of an extra buffer used for the actual preparation of the data. This is unnecessary and can be replaced by a simple clone instead of an full copy before each send. This makes also the send_raw_packet function obsolete. Reported-by:
David S. Miller <davem@davemloft.net> Signed-off-by:
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Sven Eckelmann authored
All originator messages are send through aggregation buffers. Those buffers can directly be allocated as skb to reduce the cost of allocation an extra buffer and copying them to a new allocated skb directly before it gets send. Now only the skb must be cloned in case of send_packet_to_if as it gets called by send_packet for each interface. Non-primary ogms must not cloned at all because they will only send once and the forward_packet structure is freed by send_outstanding_bat_packet afterwards. Reported-by:
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Sven Eckelmann authored
batman-adv tries to resend broadcasts on all interfaces up to three times. For each round and each interface it must provide a skb which gets consumed by the sending function. It is unnecessary to copy the data of each broadcast because the actual data is either not shared or already copied by add_bcast_packet_to_list. So it is enough to just copy the skb control data Reported-by:
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Sven Eckelmann authored
my_skb_push provided an easy way to allocate enough headroom in situation were we don't have enough space left and move the data pointer to the new position, but we didn't checked wether we are allowed to write to the new pushed header. This is for example a problem when the skb was cloned and thus doesn't have a private data part. my_skb_head_push now replaces my_skb_push by using skb_cow_head to provide only a large enough, writable header without testing for the rest of the (maybe shared) data. It will also move the data pointer using skb_push when skb_cow_head doesn't fail. This should give us enough flexibility in situation were skbs will be queued by underlying layers and still doesn't unnecessarily copy the data in situations when the skb was consumed right away during dev_queue_xmit. Reported-by:
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Marek Lindner authored
Batman-adv globally registered the batman-adv packet type and installed a hook to batman_skb_recv(). Each interface receiving a packet with that type would end up in this function which then had to loop through all batman-adv internal interface structures to find the its meta data. The more interfaces a system had the longer the loops might take. Each and every packet goes through this function making it a performance critical loop. This patch installs the hook for each activated interface. The called batman_skb_recv() can distinguish these calls, therefore avoiding the loop through the interface structures. Signed-off-by:
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Sven Eckelmann authored
It is unnecessary to generate an icmp packet in an extra memory region and than copying it to a new allocated skb. This also resolved the problem that we do inform the user that we couldn't send the packet because we couldn't allocate the socket buffer. Signed-off-by:
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Andreas Langer authored
This patch implements a simple layer2 fragmentation to allow traffic exchange over network interfaces with a MTU smaller than 1500 bytes. The fragmentation splits the big packets into two parts and marks the frames accordingly. The receiving end buffers the packets to reassemble the orignal packet before passing it to the higher layers. This feature makes it necessary to modify the batman-adv encapsulation for unicast packets by adding a sequence number, flags and the originator address. This modifcation is part of a seperate packet type for fragemented packets to keep the original overhead as low as possible. This patch enables the feature by default to ensure the data traffic can travel through the network. But it also prints a warning to notify the user about the performance implications. Note: Fragmentation should be avoided at all costs since it has a dramatic impact on the performance, especially when it comes wifi networks. Instead of a single packet, 2 packets have to be sent! Not only valuable airtime is wasted but also packetloss decreases the throughput. A link with 50% packetloss and fragmentation enabled is pretty much unusable. Signed-off-by:
Andreas Langer <an.langer@gmx.de> [sven.eckelmann@gmx.de: Rework on top of current version] Signed-off-by:
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Marek Lindner authored
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Simon Wunderlich authored
to support multiple mesh devices later, we need to move global variables like the queues into corresponding private structs bat_priv of the soft devices. Note that this patch still has a lot of FIXMEs and depends on the global soft_device variable. This should be resolved later, e.g. by referencing the parent soft device in batman_if. Signed-off-by:
Simon Wunderlich <siwu@hrz.tu-chemnitz.de> [sven.eckelmann@gmx.de: Rework on top of current version] Signed-off-by:
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Sven Eckelmann authored
The Kernighan algorithm is not able to calculate the number of set bits in parallel and the compiler cannot replace it with optimized instructions. The kernel provides specialised functions for each cpu which can either use a software implementation or hardware instruction depending on the target cpu. Reported-by:
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Simon Wunderlich authored
The Ethernet header is counted when transmitting a packet, so it should also be counted when receiving a packet. With this patch, the rx_bytes and tx_bytes statistics behave like an ordinary Ethernet interface. Signed-off-by:
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Sven Eckelmann authored
Version 2010.1.0 of the extra kernel module was released and thus the documentation should be updated and everything prepared for the the upcoming patchset. Signed-off-by:
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