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path: root/drivers/net/ns83820.c
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* ethtool: cosmetic: Use ethtool ethtool_cmd_speed APIDavid Decotigny2011-04-29
| | | | | | | | | | | | | | | | | | | | This updates the network drivers so that they don't access the ethtool_cmd::speed field directly, but use ethtool_cmd_speed() instead. For most of the drivers, these changes are purely cosmetic and don't fix any problem, such as for those 1GbE/10GbE drivers that indirectly call their own ethtool get_settings()/mii_ethtool_gset(). The changes are meant to enforce code consistency and provide robustness with future larger throughputs, at the expense of a few CPU cycles for each ethtool operation. All drivers compiled with make allyesconfig ion x86_64 have been updated. Tested: make allyesconfig on x86_64 + e1000e/bnx2x work Signed-off-by: David Decotigny <decot@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* Fix common misspellingsLucas De Marchi2011-03-31
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* ns83820: Avoid bad pointer deref in ns83820_init_one().Jesper Juhl2011-01-18
| | | | | | | | | | | | | | | | | In drivers/net/ns83820.c::ns83820_init_one() we dynamically allocate memory via alloc_etherdev(). We then call PRIV() on the returned storage which is 'return netdev_priv()'. netdev_priv() takes the pointer it is passed and adds 'ALIGN(sizeof(struct net_device), NETDEV_ALIGN)' to it and returns it. Then we test the resulting pointer for NULL, which it is unlikely to be at this point, and later dereference it. This will go bad if alloc_etherdev() actually returned NULL. This patch reworks the code slightly so that we test for a NULL pointer (and return -ENOMEM) directly after calling alloc_etherdev(). Signed-off-by: Jesper Juhl <jj@chaosbits.net> Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: spin_lock_irq() => spin_lock()Dan Carpenter2010-10-18
| | | | | | | | | | | | | | | | This is essentially cosmetic. At this point the IRQs are already disabled because we called spin_lock_irq(&dev->rx_info.lock). The real bug here was fixed back in 2006 in 3a10ccebe: "[PATCH] lock validator: fix ns83820.c irq-flags bug". Prior to that patch, it was a "spin_lock_irq is not nestable" type bug. The 2006 patch changes the unlock to not re-enable IRQs, which eliminates the potential deadlock. But this bit was missed. We should change the lock function as well so it balances nicely. Signed-off-by: Dan Carpenter <error27@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: Use predefined autoneg constantsDenis Kirjanov2010-09-06
| | | | | Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: Add copper device settingsDenis Kirjanov2010-09-06
| | | | | Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: Remove unused have_optical variable.Denis Kirjanov2010-09-06
| | | | | Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* drivers/net: avoid some skb->ip_summed initializationsEric Dumazet2010-09-02
| | | | | | | | | | | | | | | | | | | | fresh skbs have ip_summed set to CHECKSUM_NONE (0) We can avoid setting again skb->ip_summed to CHECKSUM_NONE in drivers. Introduce skb_checksum_none_assert() helper so that we keep this assertion documented in driver sources. Change most occurrences of : skb->ip_summed = CHECKSUM_NONE; by : skb_checksum_none_assert(skb); Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: Use helper to disable chip interruptsDenis Kirjanov2010-09-01
| | | | | | | Use helper routine to disable chip interrupts. Signed-off-by: Denis Kirjanov <dkirjanov@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: Use the instance of net_device_stats from net_device.Kulikov Vasiliy2010-07-05
| | | | | | | | Since net_device has an instance of net_device_stats, we can remove the instance of this from the adapter structure. Signed-off-by: Kulikov Vasiliy <segooon@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* include cleanup: Update gfp.h and slab.h includes to prepare for breaking ↵Tejun Heo2010-03-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
* net: use netdev_mc_count and netdev_mc_empty when appropriateJiri Pirko2010-02-12
| | | | | | | | | | | This patch replaces dev->mc_count in all drivers (hopefully I didn't miss anything). Used spatch and did small tweaks and conding style changes when it was suitable. Jirka Signed-off-by: Jiri Pirko <jpirko@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* drivers/net/: use DEFINE_PCI_DEVICE_TABLE()Alexey Dobriyan2010-01-08
| | | | | | | | Use DEFINE_PCI_DEVICE_TABLE() so we get place PCI ids table into correct section in every case. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* drivers/net: Move && and || to end of previous lineJoe Perches2009-12-03
| | | | | | | | | | | | | | Only files where David Miller is the primary git-signer. wireless, wimax, ixgbe, etc are not modified. Compile tested x86 allyesconfig only Not all files compiled (not x86 compatible) Added a few > 80 column lines, which I ignored. Existing checkpatch complaints ignored. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* headers: remove sched.h from interrupt.hAlexey Dobriyan2009-10-11
| | | | | | | | After m68k's task_thread_info() doesn't refer to current, it's possible to remove sched.h from interrupt.h and not break m68k! Many thanks to Heiko Carstens for allowing this. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
* netdev: convert bulk of drivers to netdev_tx_tStephen Hemminger2009-09-01
| | | | | | | | | | | | In a couple of cases collapse some extra code like: int retval = NETDEV_TX_OK; ... return retval; into return NETDEV_TX_OK; Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: use symbolic values for ndo_start_xmit() return codesPatrick McHardy2009-06-13
| | | | | | | | | | Convert magic values 1 and -1 to NETDEV_TX_BUSY and NETDEV_TX_LOCKED respectively. 0 (NETDEV_TX_OK) is not changed to keep the noise down, except in very few cases where its in direct proximity to one of the other values. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: dont update dev->trans_startEric Dumazet2009-05-29
| | | | | | | | | | | | | Second round of drivers for Gb cards (and NIU one I forgot in the 10GB round) Now that core network takes care of trans_start updates, dont do it in drivers themselves, if possible. Drivers can avoid one cache miss (on dev->trans_start) in their start_xmit() handler. Exceptions are NETIF_F_LLTX drivers Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)Yang Hongyang2009-04-07
| | | | | | | | Replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64)Yang Hongyang2009-04-07
| | | | | | | | Replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) Signed-off-by: Yang Hongyang<yanghy@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* ns83820: remove some pointless conditionals before kfree_skb()Wei Yongjun2009-02-27
| | | | | | | Remove some pointless conditionals before kfree_skb(). Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* drivers/net/ns83820.c: fix sparse warnings: fix signednessHannes Eder2009-02-17
| | | | | | | | | | | Fix this sparse warnings: drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness) drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness) drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness) drivers/net/ns83820.c:479:36: warning: incorrect type in argument 2 (different signedness) Signed-off-by: Hannes Eder <hannes@hanneseder.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* netdev: add missing set_mac_address hookStephen Hemminger2009-01-11
| | | | | | | | Many drivers lost the ability to set ethernet address accidently during the net_device_ops conversion. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: fix net_device_ops supportStephen Hemminger2009-01-07
| | | | | | | The vlan_rx_register fuction is now in net_device_ops Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns83820: convert to net_device_opsStephen Hemminger2008-11-21
| | | | | | | Convert driver to new net_device_ops. Compile tested only. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: convert print_mac to %pMJohannes Berg2008-10-27
| | | | | | | | | | | | This converts pretty much everything to print_mac. There were a few things that had conflicts which I have just dropped for now, no harm done. I've built an allyesconfig with this and looked at the files that weren't built very carefully, but it's a huge patch. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* ns8320: use netdev_alloc_skbStephen Hemminger2008-05-30
| | | | | | | | | | Use netdev_alloc_skb. This sets skb->dev and allows arch specific allocation. Compile tested only. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
* NET: ns83820.c remove fastcall macroDavid Miller2008-01-28
| | | | | Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* [NET]: fix drivers/net/ns83820.c buildAndrew Morton2008-01-28
| | | | | Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET]: Remove FASTCALL macroHarvey Harrison2008-01-28
| | | | | | | | X86_32 was the last user of the FASTCALL macro, now that it uses regparm(3) by default, this macro expands to nothing. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET]: Introduce and use print_mac() and DECLARE_MAC_BUF()Joe Perches2007-10-10
| | | | | | | This is nicer than the MAC_FMT stuff. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET]: Nuke SET_MODULE_OWNER macro.Ralf Baechle2007-10-10
| | | | | | | | | | | | It's been a useless no-op for long enough in 2.6 so I figured it's time to remove it. The number of people that could object because they're maintaining unified 2.4 and 2.6 drivers is probably rather small. [ Handled drivers added by netdev tree and some missed IRDA cases... -DaveM ] Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [netdrvr] ns83820: add ethtool media supportJeff Garzik2007-10-10
| | | | | | Split out from patch authored by Dan Faerch <dan@hacker.dk>. Signed-off-by: Jeff Garzik <jeff@garzik.org>
* NS83820: Handle multicast frames.YOSHIFUJI Hideaki / 吉藤英明2007-07-18
| | | | | | | Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> -- Signed-off-by: Jeff Garzik <jeff@garzik.org>
* drivers/net/ns83820.c: fix a check-after-useAdrian Bunk2007-07-02
| | | | | | | This patch fixes a check-after-use spotted by the Coverity checker. Signed-off-by: Adrian Bunk <bunk@stusta.de> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* network drivers: eliminate unneeded kill_vid codeStephen Hemminger2007-06-03
| | | | | | | | | | | | Many drivers had code that did kill_vid, but they weren't doing vlan filtering. With new API the stub is unneeded unless device sets NETIF_F_HW_VLAN_FILTER. Bad habit: I couldn't resist fixing a couple of nearby style things in acenic, and forcedeth. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* header cleaning: don't include smp_lock.h when not usedRandy Dunlap2007-05-08
| | | | | | | | | | | | Remove includes of <linux/smp_lock.h> where it is not used/needed. Suggested by Al Viro. Builds cleanly on x86_64, i386, alpha, ia64, powerpc, sparc, sparc64, and arm (all 59 defconfigs). Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* [SK_BUFF]: Introduce ip_hdr(), remove skb->nh.iphArnaldo Carvalho de Melo2007-04-26
| | | | | Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [ETH]: Make eth_type_trans set skb->dev like the other *_type_transArnaldo Carvalho de Melo2007-04-26
| | | | | | | One less thing for drivers writers to worry about. Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [VLAN]: Avoid a 4-order allocation.Dan Aloni2007-03-02
| | | | | | | | | | | | | | This patch splits the vlan_group struct into a multi-allocated struct. On x86_64, the size of the original struct is a little more than 32KB, causing a 4-order allocation, which is prune to problems caused by buddy-system external fragmentation conditions. I couldn't just use vmalloc() because vfree() cannot be called in the softirq context of the RCU callback. Signed-off-by: Dan Aloni <da-x@monatomic.org> Acked-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' into upstreamJeff Garzik2006-12-07
|\ | | | | | | | | | | | | Conflicts: drivers/net/netxen/netxen_nic.h drivers/net/netxen/netxen_nic_main.c
| * WorkStruct: make allyesconfigDavid Howells2006-11-22
| | | | | | | | | | | | Fix up for make allyesconfig. Signed-Off-By: David Howells <dhowells@redhat.com>
* | [PATCH] ns83820 annotationsAl Viro2006-12-04
|/ | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells2006-10-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
* Merge branch 'upstream-linus' of ↵Linus Torvalds2006-09-24
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6 * 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6: (217 commits) net/ieee80211: fix more crypto-related build breakage [PATCH] Spidernet: add ethtool -S (show statistics) [NET] GT96100: Delete bitrotting ethernet driver [PATCH] mv643xx_eth: restrict to 32-bit PPC_MULTIPLATFORM [PATCH] Cirrus Logic ep93xx ethernet driver r8169: the MMIO region of the 8167 stands behin BAR#1 e1000, ixgb: Remove pointless wrappers [PATCH] Remove powerpc specific parts of 3c509 driver [PATCH] s2io: Switch to pci_get_device [PATCH] gt96100: move to pci_get_device API [PATCH] ehea: bugfix for register access functions [PATCH] e1000 disable device on PCI error drivers/net/phy/fixed: #if 0 some incomplete code drivers/net: const-ify ethtool_ops declarations [PATCH] ethtool: allow const ethtool_ops [PATCH] sky2: big endian [PATCH] sky2: fiber support [PATCH] sky2: tx pause bug fix drivers/net: Trim trailing whitespace [PATCH] ehea: IBM eHEA Ethernet Device Driver ... Manually resolved conflicts in drivers/net/ixgb/ixgb_main.c and drivers/net/sky2.c related to CHECKSUM_HW/CHECKSUM_PARTIAL changes by commit 84fa7933a33f806bbbaae6775e87459b1ec584c0 that just happened to be next to unrelated changes in this update.
| * drivers/net: const-ify ethtool_ops declarationsJeff Garzik2006-09-13
| | | | | | | | Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * drivers/net: Trim trailing whitespaceJeff Garzik2006-09-13
| | | | | | | | Signed-off-by: Jeff Garzik <jeff@garzik.org>
| * drivers/net: Remove deprecated use of pci_module_init()Jeff Garzik2006-08-19
| | | | | | | | | | | | | | From: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Signed-off-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
* | [NET]: Replace CHECKSUM_HW by CHECKSUM_PARTIAL/CHECKSUM_COMPLETEPatrick McHardy2006-09-22
|/ | | | | | | | | | | Replace CHECKSUM_HW by CHECKSUM_PARTIAL (for outgoing packets, whose checksum still needs to be completed) and CHECKSUM_COMPLETE (for incoming packets, device supplied full checksum). Patch originally from Herbert Xu, updated by myself for 2.6.18-rc3. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* [PATCH] lock validator: fix ns83820.c irq-flags bugIngo Molnar2006-07-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Barry K. Nathan reported the following lockdep warning: [ 197.343948] BUG: warning at kernel/lockdep.c:1856/trace_hardirqs_on() [ 197.345928] [<c010329b>] show_trace_log_lvl+0x5b/0x105 [ 197.346359] [<c0103896>] show_trace+0x1b/0x20 [ 197.346759] [<c01038ed>] dump_stack+0x1f/0x24 [ 197.347159] [<c012efa2>] trace_hardirqs_on+0xfb/0x185 [ 197.348873] [<c029b009>] _spin_unlock_irq+0x24/0x2d [ 197.350620] [<e09034e8>] do_tx_done+0x171/0x179 [ns83820] [ 197.350895] [<e090445c>] ns83820_irq+0x149/0x20b [ns83820] [ 197.351166] [<c013b4b8>] handle_IRQ_event+0x1d/0x52 [ 197.353216] [<c013c6c2>] handle_level_irq+0x97/0xe1 [ 197.355157] [<c01048c3>] do_IRQ+0x8b/0xac [ 197.355612] [<c0102d9d>] common_interrupt+0x25/0x2c this is caused because the ns83820 driver re-enables irq flags in hardirq context. While legal in theory, in practice it should only be done if the hardware is really old and has some very high overhead in its ISR. (such as PIO IDE) For modern hardware, running ISRs with irqs enabled is discouraged, because 1) new hardware is fast enough to not cause latency problems 2) allowing the nesting of hardware interrupts only 'spreads out' the handling of the current ISR, causing extra cachemisses that would otherwise not happen. Furthermore, on architectures where ISRs share the kernel stacks, enabling interrupts in ISRs introduces a much higher kernel-stack-nesting and thus kernel-stack-overflow risk. 3) not managing irq-flags via the _irqsave / _irqrestore variants is dangerous: it's easy to forget whether one function nests inside another, and irq flags might be mismanaged. In the few cases where re-enabling interrupts in an ISR is considered useful (and unavoidable), it has to be taught to the lock validator explicitly (because the lock validator needs the "no ISR ever enables hardirqs" artificial simplification to keep the IRQ/softirq locking dependencies manageable). This teaching is done via the explicit use local_irq_enable_in_hardirq(). On a stock kernel this maps to local_irq_enable(). If the lock validator is enabled then this does not enable interrupts. Now, the analysis of drivers/net/ns83820.c's irq flags use: the irq-enabling in irq context seems intentional, but i dont think it's justified. Furthermore, the driver suffers from problem #3 above too, in ns83820_tx_timeout() it disables irqs via local_irq_save(), but then it calls do_tx_done() which does a spin_unlock_irq(), re-enabling for a function that does not expect it! While currently this bug seems harmless (only some debug printout seems to be affected by it), it's nevertheless something to be fixed. So this patch makes the ns83820 ISR irq-flags-safe, and cleans up do_tx_done() use and locking to avoid the ns83820_tx_timeout() bug. From: Arjan van de Ven <arjan@linux.intel.com> ns83820_mib_isr takes the misc_lock in IRQ context. All other places that do this in the ISR already use _irqsave versions, make this consistent at least. At some point in the future someone should audit the driver to see if all _irqsave's in the ISR can go away, this is generally an iffy/fragile proposition though; for now get it safe, simple and consistent. From: Arjan van de Ven <arjan@linux.intel.com> ok this is a real driver deadlock: The ns83820 driver enabled interrupts (by unlocking the misc_lock with _irq) while still holding the rx_info.lock, which is required to be irq safe since it's used in the ISR like this: writel(1, dev->base + IER); spin_unlock_irq(&dev->misc_lock); kick_rx(ndev); spin_unlock_irq(&dev->rx_info.lock); This is can cause a deadlock if an irq was pending at the first spin_unlock_irq already, or if one would hit during kick_rx(). Simply remove the first _irq solves this Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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