On 03/01/08 18:18, Ian Abbott wrote: > On 02/11/07 21:16, [EMAIL PROTECTED] wrote: >> The "Fake" PCI Hot Plug module fakephp does not complete the slot >> shutdown and will hang a terminal. >> >> >> I am attempting to use the fakephp module to shutdown and restart a >> PCI Express FPGA board when the FPGA is reloaded. Using 2.6.22 >> (Ubuntu 7.10) or 2.6.21 (Fedora Core 7) I cannot get this >> functionality to work. Sending a '1' to the power file causes no >> change or debug output in dmesg and sending a '0' causes the terminal >> to hang. Please CC me as I am not subscribed to the mailing list. > > I encountered the same problem today with a 2.6.24-rc6-git9 x86_64 SMP > kernel when testing the hotplug sections of a driver I wrote. The > terminal locks up when echoing a '0' to a PCI slot's "power" file. I > added a few dbg calls in the fs_remove_slot function in > pci_hotplug_core.c and it seems that the call to sysfs_remove_file to > remove the "power" file that is being written to does not return. > Perhaps the code is locking the same mutex twice in this situation?
Just a bit more maybe-helpful info.... 1. The problem appeared in 2.6.21. 2.6.20 works. 2. When the process writing 0 to the 'power' file is hung, running 'ls /sys/bus/pci/slots/<slotname>' shows an empty directory, i.e. the unlink of the 'power' file is at least partially complete but the <slotname> directory remains. -- -=( Ian Abbott @ MEV Ltd. E-mail: <[EMAIL PROTECTED]> )=- -=( Tel: +44 (0)161 477 1898 FAX: +44 (0)161 718 3587 )=- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
